<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:539f328a-dc38-46c3-bc7d-fad56a84c5d2,g:2fb90a23-4fe6-43df-9abe-2c355eef0a5d-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:spxc="http://www.spx.com/20250329" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types1="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2022-03-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.spx.com/20250329">
  <xs:import namespace="http://fasb.org/srt/2024" schemaLocation="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2024" schemaLocation="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2024" schemaLocation="https://xbrl.sec.gov/country/2024/country-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2024" schemaLocation="https://xbrl.sec.gov/dei/2024/dei-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2024" schemaLocation="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20250329_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20250329_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20250329_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20250329_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.spx.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVEINCOME" roleURI="http://www.spx.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVEINCOME">
        <link:definition>9952151 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDBALANCESHEETS" roleURI="http://www.spx.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS">
        <link:definition>9952152 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" roleURI="http://www.spx.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical">
        <link:definition>9952153 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" roleURI="http://www.spx.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY">
        <link:definition>9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" roleURI="http://www.spx.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS">
        <link:definition>9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" roleURI="http://www.spx.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical">
        <link:definition>9952156 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BASISOFPRESENTATION" roleURI="http://www.spx.com/role/BASISOFPRESENTATION">
        <link:definition>9952157 - Disclosure - BASIS OF PRESENTATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NEWACCOUNTINGPRONOUNCEMENTS" roleURI="http://www.spx.com/role/NEWACCOUNTINGPRONOUNCEMENTS">
        <link:definition>9952158 - Disclosure - NEW ACCOUNTING PRONOUNCEMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AQUISITIONSANDDISCONTINUEDOPERATIONS" roleURI="http://www.spx.com/role/AQUISITIONSANDDISCONTINUEDOPERATIONS">
        <link:definition>9952159 - Disclosure - AQUISITIONS AND DISCONTINUED OPERATIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUESFROMCONTRACTS" roleURI="http://www.spx.com/role/REVENUESFROMCONTRACTS">
        <link:definition>9952160 - Disclosure - REVENUES FROM CONTRACTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASES" roleURI="http://www.spx.com/role/LEASES">
        <link:definition>9952161 - Disclosure - LEASES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONREPORTABLESEGMENTS" roleURI="http://www.spx.com/role/INFORMATIONONREPORTABLESEGMENTS">
        <link:definition>9952162 - Disclosure - INFORMATION ON REPORTABLE SEGMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SPECIALCHARGESNET" roleURI="http://www.spx.com/role/SPECIALCHARGESNET">
        <link:definition>9952163 - Disclosure - SPECIAL CHARGES, NET</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIESNET" roleURI="http://www.spx.com/role/INVENTORIESNET">
        <link:definition>9952164 - Disclosure - INVENTORIES, NET</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETS" roleURI="http://www.spx.com/role/GOODWILLANDOTHERINTANGIBLEASSETS">
        <link:definition>9952165 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="WARRANTY" roleURI="http://www.spx.com/role/WARRANTY">
        <link:definition>9952166 - Disclosure - WARRANTY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANS" roleURI="http://www.spx.com/role/EMPLOYEEBENEFITPLANS">
        <link:definition>9952167 - Disclosure - EMPLOYEE BENEFIT PLANS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INDEBTEDNESS" roleURI="http://www.spx.com/role/INDEBTEDNESS">
        <link:definition>9952168 - Disclosure - INDEBTEDNESS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVEFINANCIALINSTRUMENTS" roleURI="http://www.spx.com/role/DERIVATIVEFINANCIALINSTRUMENTS">
        <link:definition>9952169 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATION" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATION">
        <link:definition>9952170 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONTINGENTLIABILITIESANDOTHERMATTERS" roleURI="http://www.spx.com/role/CONTINGENTLIABILITIESANDOTHERMATTERS">
        <link:definition>9952171 - Disclosure - CONTINGENT LIABILITIES AND OTHER MATTERS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMEANDOTHERTAXES" roleURI="http://www.spx.com/role/INCOMEANDOTHERTAXES">
        <link:definition>9952172 - Disclosure - INCOME AND OTHER TAXES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUE" roleURI="http://www.spx.com/role/FAIRVALUE">
        <link:definition>9952173 - Disclosure - FAIR VALUE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUBSEQUENTEVENTS" roleURI="http://www.spx.com/role/SUBSEQUENTEVENTS">
        <link:definition>9952174 - Disclosure - SUBSEQUENT EVENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BASISOFPRESENTATIONPolicies" roleURI="http://www.spx.com/role/BASISOFPRESENTATIONPolicies">
        <link:definition>9955511 - Disclosure - BASIS OF PRESENTATION (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONSANDDISCONTINUEDOPERATIONSTables" roleURI="http://www.spx.com/role/ACQUISITIONSANDDISCONTINUEDOPERATIONSTables">
        <link:definition>9955512 - Disclosure - ACQUISITIONS AND DISCONTINUED OPERATIONS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUESFROMCONTRACTSTables" roleURI="http://www.spx.com/role/REVENUESFROMCONTRACTSTables">
        <link:definition>9955513 - Disclosure - REVENUES FROM CONTRACTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONREPORTABLESEGMENTSTables" roleURI="http://www.spx.com/role/INFORMATIONONREPORTABLESEGMENTSTables">
        <link:definition>9955514 - Disclosure - INFORMATION ON REPORTABLE SEGMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SPECIALCHARGESNETTables" roleURI="http://www.spx.com/role/SPECIALCHARGESNETTables">
        <link:definition>9955515 - Disclosure - SPECIAL CHARGES, NET (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIESNETTables" roleURI="http://www.spx.com/role/INVENTORIESNETTables">
        <link:definition>9955516 - Disclosure - INVENTORIES, NET (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSTables" roleURI="http://www.spx.com/role/GOODWILLANDOTHERINTANGIBLEASSETSTables">
        <link:definition>9955517 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="WARRANTYTables" roleURI="http://www.spx.com/role/WARRANTYTables">
        <link:definition>9955518 - Disclosure - WARRANTY (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSTables" roleURI="http://www.spx.com/role/EMPLOYEEBENEFITPLANSTables">
        <link:definition>9955519 - Disclosure - EMPLOYEE BENEFIT PLANS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INDEBTEDNESSTables" roleURI="http://www.spx.com/role/INDEBTEDNESSTables">
        <link:definition>9955520 - Disclosure - INDEBTEDNESS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONTables" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONTables">
        <link:definition>9955521 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BASISOFPRESENTATIONDetails" roleURI="http://www.spx.com/role/BASISOFPRESENTATIONDetails">
        <link:definition>9955522 - Disclosure - BASIS OF PRESENTATION (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONSANDDISCONTINUEDOPERATIONSNarrativeDetails" roleURI="http://www.spx.com/role/ACQUISITIONSANDDISCONTINUEDOPERATIONSNarrativeDetails">
        <link:definition>9955523 - Disclosure - ACQUISITIONS AND DISCONTINUED OPERATIONS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONSANDDISCONTINUEDOPERATIONSAcquisitionofKTSIngniaDetails" roleURI="http://www.spx.com/role/ACQUISITIONSANDDISCONTINUEDOPERATIONSAcquisitionofKTSIngniaDetails">
        <link:definition>9955524 - Disclosure - ACQUISITIONS AND DISCONTINUED OPERATIONS - Acquisition of KTS &amp; Ing&#233;nia (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONSANDDISCONTINUEDOPERATIONSProFormaResultsDetails" roleURI="http://www.spx.com/role/ACQUISITIONSANDDISCONTINUEDOPERATIONSProFormaResultsDetails">
        <link:definition>9955525 - Disclosure - ACQUISITIONS AND DISCONTINUED OPERATIONS - Pro Forma Results (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONSANDDISCONTINUEDOPERATIONSWindDownofDBTAssetsandLiabilitiesofDiscontinuedOperationsDetails" roleURI="http://www.spx.com/role/ACQUISITIONSANDDISCONTINUEDOPERATIONSWindDownofDBTAssetsandLiabilitiesofDiscontinuedOperationsDetails">
        <link:definition>9955526 - Disclosure - ACQUISITIONS AND DISCONTINUED OPERATIONS - Wind-Down of DBT - Assets and Liabilities of Discontinued Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONSANDDISCONTINUEDOPERATIONSWindDownofHeatTransferBusinessAssetsandLiabilitiesofDiscontinuedOperationsDetails" roleURI="http://www.spx.com/role/ACQUISITIONSANDDISCONTINUEDOPERATIONSWindDownofHeatTransferBusinessAssetsandLiabilitiesofDiscontinuedOperationsDetails">
        <link:definition>9955527 - Disclosure - ACQUISITIONS AND DISCONTINUED OPERATIONS - Wind-Down of Heat Transfer Business - Assets and Liabilities of Discontinued Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONSANDDISCONTINUEDOPERATIONSResultsofOperationsDetails" roleURI="http://www.spx.com/role/ACQUISITIONSANDDISCONTINUEDOPERATIONSResultsofOperationsDetails">
        <link:definition>9955528 - Disclosure - ACQUISITIONS AND DISCONTINUED OPERATIONS - Results of Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUESFROMCONTRACTSDisaggregatedRevenueDetails" roleURI="http://www.spx.com/role/REVENUESFROMCONTRACTSDisaggregatedRevenueDetails">
        <link:definition>9955529 - Disclosure - REVENUES FROM CONTRACTS - Disaggregated Revenue (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUESFROMCONTRACTSContractBalancesDetails" roleURI="http://www.spx.com/role/REVENUESFROMCONTRACTSContractBalancesDetails">
        <link:definition>9955530 - Disclosure - REVENUES FROM CONTRACTS - Contract Balances (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUESFROMCONTRACTSNarrativeDetails" roleURI="http://www.spx.com/role/REVENUESFROMCONTRACTSNarrativeDetails">
        <link:definition>9955531 - Disclosure - REVENUES FROM CONTRACTS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUESFROMCONTRACTSPerformanceObligationNarrativeDetails" roleURI="http://www.spx.com/role/REVENUESFROMCONTRACTSPerformanceObligationNarrativeDetails">
        <link:definition>9955532 - Disclosure - REVENUES FROM CONTRACTS - Performance Obligation Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUESFROMCONTRACTSPerformanceObligationNarrativeDetails_1" roleURI="http://www.spx.com/role/REVENUESFROMCONTRACTSPerformanceObligationNarrativeDetails_1">
        <link:definition>9955532 - Disclosure - REVENUES FROM CONTRACTS - Performance Obligation Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONREPORTABLESEGMENTSNarrativeDetails" roleURI="http://www.spx.com/role/INFORMATIONONREPORTABLESEGMENTSNarrativeDetails">
        <link:definition>9955533 - Disclosure - INFORMATION ON REPORTABLE SEGMENTS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONREPORTABLESEGMENTSFinancialDataDetails" roleURI="http://www.spx.com/role/INFORMATIONONREPORTABLESEGMENTSFinancialDataDetails">
        <link:definition>9955534 - Disclosure - INFORMATION ON REPORTABLE SEGMENTS - Financial Data (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SPECIALCHARGESNETSpecialChargesDetails" roleURI="http://www.spx.com/role/SPECIALCHARGESNETSpecialChargesDetails">
        <link:definition>9955535 - Disclosure - SPECIAL CHARGES, NET - Special Charges (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SPECIALCHARGESNETAnalysisofRestructuringLiabilitiesDetails" roleURI="http://www.spx.com/role/SPECIALCHARGESNETAnalysisofRestructuringLiabilitiesDetails">
        <link:definition>9955536 - Disclosure - SPECIAL CHARGES, NET - Analysis of Restructuring Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIESNETDetails" roleURI="http://www.spx.com/role/INVENTORIESNETDetails">
        <link:definition>9955537 - Disclosure - INVENTORIES, NET (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSGoodwillDetails" roleURI="http://www.spx.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillDetails">
        <link:definition>9955538 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSOtherIntangiblesNetDetails" roleURI="http://www.spx.com/role/GOODWILLANDOTHERINTANGIBLEASSETSOtherIntangiblesNetDetails">
        <link:definition>9955539 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangibles, Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSOtherIntangiblesNetAdditionalInformationDetails" roleURI="http://www.spx.com/role/GOODWILLANDOTHERINTANGIBLEASSETSOtherIntangiblesNetAdditionalInformationDetails">
        <link:definition>9955540 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangibles, Net - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails" roleURI="http://www.spx.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails">
        <link:definition>9955541 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="WARRANTYDetails" roleURI="http://www.spx.com/role/WARRANTYDetails">
        <link:definition>9955542 - Disclosure - WARRANTY (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSNarrativeDetails" roleURI="http://www.spx.com/role/EMPLOYEEBENEFITPLANSNarrativeDetails">
        <link:definition>9955543 - Disclosure - EMPLOYEE BENEFIT PLANS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSNetPeriodicIncomeExpenseDetails" roleURI="http://www.spx.com/role/EMPLOYEEBENEFITPLANSNetPeriodicIncomeExpenseDetails">
        <link:definition>9955544 - Disclosure - EMPLOYEE BENEFIT PLANS - Net Periodic (Income) Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INDEBTEDNESSSummaryofDebtActivityDetails" roleURI="http://www.spx.com/role/INDEBTEDNESSSummaryofDebtActivityDetails">
        <link:definition>9955545 - Disclosure - INDEBTEDNESS - Summary of Debt Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INDEBTEDNESSSeniorCreditFacilitiesDetails" roleURI="http://www.spx.com/role/INDEBTEDNESSSeniorCreditFacilitiesDetails">
        <link:definition>9955546 - Disclosure - INDEBTEDNESS - Senior Credit Facilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INDEBTEDNESSCompanyownedLifeInsuranceDetails" roleURI="http://www.spx.com/role/INDEBTEDNESSCompanyownedLifeInsuranceDetails">
        <link:definition>9955547 - Disclosure - INDEBTEDNESS - Company-owned Life Insurance (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVEFINANCIALINSTRUMENTSDetails" roleURI="http://www.spx.com/role/DERIVATIVEFINANCIALINSTRUMENTSDetails">
        <link:definition>9955548 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONComponentsUsedForCalculationOfBasicAndDilutedIncomeDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONComponentsUsedForCalculationOfBasicAndDilutedIncomeDetails">
        <link:definition>9955549 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Components Used For Calculation Of Basic And Diluted Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONIncomePerShareNarrativeDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONIncomePerShareNarrativeDetails">
        <link:definition>9955550 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Income Per Share Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONLongTermIncentiveCompensationDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONLongTermIncentiveCompensationDetails">
        <link:definition>9955551 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Long Term Incentive Compensation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONAssumptionsInDeterminingTheFairValueofAwardsGrantedDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONAssumptionsInDeterminingTheFairValueofAwardsGrantedDetails">
        <link:definition>9955552 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Assumptions In Determining The Fair Value of Awards Granted (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONPSUsRSUsDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONPSUsRSUsDetails">
        <link:definition>9955553 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - PSU's, RSU's (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONPSUsRSUsNarrativeDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONPSUsRSUsNarrativeDetails">
        <link:definition>9955554 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - PSU's, RSU's Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONStockOptionsNarrativeDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONStockOptionsNarrativeDetails">
        <link:definition>9955555 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Stock Options - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONBlackScholesOptionPricingModelDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONBlackScholesOptionPricingModelDetails">
        <link:definition>9955556 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Black-Scholes Option-Pricing Model (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONStockOptionsDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONStockOptionsDetails">
        <link:definition>9955557 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Stock Options (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONRepurchasesofCommonStockDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONRepurchasesofCommonStockDetails">
        <link:definition>9955558 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Repurchases of Common Stock (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONAccumulatedOtherComprehensiveIncomeDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONAccumulatedOtherComprehensiveIncomeDetails">
        <link:definition>9955559 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Accumulated Other Comprehensive Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONComponentsofAOCIDetails" roleURI="http://www.spx.com/role/STOCKHOLDERSEQUITYANDLONGTERMINCENTIVECOMPENSATIONComponentsofAOCIDetails">
        <link:definition>9955560 - Disclosure - STOCKHOLDERS' EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Components of AOCI (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONTINGENTLIABILITIESANDOTHERMATTERSGeneralDetails" roleURI="http://www.spx.com/role/CONTINGENTLIABILITIESANDOTHERMATTERSGeneralDetails">
        <link:definition>9955561 - Disclosure - CONTINGENT LIABILITIES AND OTHER MATTERS - General (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONTINGENTLIABILITIESANDOTHERMATTERSLargePowerProjectsinSouthAfricaDetails" roleURI="http://www.spx.com/role/CONTINGENTLIABILITIESANDOTHERMATTERSLargePowerProjectsinSouthAfricaDetails">
        <link:definition>9955562 - Disclosure - CONTINGENT LIABILITIES AND OTHER MATTERS - Large Power Projects in South Africa (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONTINGENTLIABILITIESANDOTHERMATTERSResulutionofDisputeContingentConsiderationrelatedtoULCDetails" roleURI="http://www.spx.com/role/CONTINGENTLIABILITIESANDOTHERMATTERSResulutionofDisputeContingentConsiderationrelatedtoULCDetails">
        <link:definition>9955563 - Disclosure - CONTINGENT LIABILITIES AND OTHER MATTERS - Resulution of DisputeContingent Consideration related to ULC (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONTINGENTLIABILITIESANDOTHERMATTERSEnvironmentalMattersDetails" roleURI="http://www.spx.com/role/CONTINGENTLIABILITIESANDOTHERMATTERSEnvironmentalMattersDetails">
        <link:definition>9955564 - Disclosure - CONTINGENT LIABILITIES AND OTHER MATTERS - Environmental Matters (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMEANDOTHERTAXESDetails" roleURI="http://www.spx.com/role/INCOMEANDOTHERTAXESDetails">
        <link:definition>9955565 - Disclosure - INCOME AND OTHER TAXES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEDetails" roleURI="http://www.spx.com/role/FAIRVALUEDetails">
        <link:definition>9955566 - Disclosure - FAIR VALUE (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUBSEQUENTEVENTSDetails" roleURI="http://www.spx.com/role/SUBSEQUENTEVENTSDetails">
        <link:definition>9955567 - Disclosure - SUBSEQUENT EVENTS (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="spxc_SpecialChargesNet" abstract="false" name="SpecialChargesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AssetsOfAbandonedEntities" abstract="false" name="AssetsOfAbandonedEntities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LiabilitiesOfAbandonedEntities" abstract="false" name="LiabilitiesOfAbandonedEntities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_CashAndCashEquivalentsIncludedInAssetsOfAbandonedEntities" abstract="false" name="CashAndCashEquivalentsIncludedInAssetsOfAbandonedEntities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_APICShareBasedPaymentArrangementLongTermIncentiveCompensationExpense" abstract="false" name="APICShareBasedPaymentArrangementLongTermIncentiveCompensationExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AmortizationOfDeferredCompensationPlanAsset" abstract="false" name="AmortizationOfDeferredCompensationPlanAsset" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreasePrepaidCompensationRelatedToAcquisition" abstract="false" name="IncreaseDecreasePrepaidCompensationRelatedToAcquisition" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BorrowingsUnderSeniorCreditFacilities" abstract="false" name="BorrowingsUnderSeniorCreditFacilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RepaymentsUnderSeniorCreditFacilities" abstract="false" name="RepaymentsUnderSeniorCreditFacilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BorrowingUnderTradeReceivablesAgreement" abstract="false" name="BorrowingUnderTradeReceivablesAgreement" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RepaymentsUnderTradeReceivablesAgreement" abstract="false" name="RepaymentsUnderTradeReceivablesAgreement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_PaymentProceedsTaxWithholdingShareBasedPaymentArrangement" abstract="false" name="PaymentProceedsTaxWithholdingShareBasedPaymentArrangement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AcquisitionsAndDiscontinuedOperationsAbstract" abstract="true" name="AcquisitionsAndDiscontinuedOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_ScheduleOfRestructuringImpairmentAndOtherActivitiesBySegmentTableTextBlock" abstract="false" name="ScheduleOfRestructuringImpairmentAndOtherActivitiesBySegmentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_ScheduleofRestructuringandIntegratedLiabilitiesTableTextBlock" abstract="false" name="ScheduleofRestructuringandIntegratedLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_ScheduleOfShareBasedPaymentAwardRestrictedStockActivityValuationAssumptionsTableTextBlock" abstract="false" name="ScheduleOfShareBasedPaymentAwardRestrictedStockActivityValuationAssumptionsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_IngeniaTechnologiesInc.Member" abstract="true" name="IngeniaTechnologiesInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_KranzeTechnologySolutionsIncMember" abstract="true" name="KranzeTechnologySolutionsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_HVACReportableSegmentMember" abstract="true" name="HVACReportableSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_CorporateExpenseMember" abstract="true" name="CorporateExpenseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_AcquisitionRelatedAndOtherCostsMember" abstract="true" name="AcquisitionRelatedAndOtherCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_CustomerBacklogMember" abstract="true" name="CustomerBacklogMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_TriggeringEventAxis" abstract="true" name="TriggeringEventAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_TriggeringEventDomain" abstract="true" name="TriggeringEventDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_RetentionAgreementsMember" abstract="true" name="RetentionAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_DBTTechnologiesMember" abstract="true" name="DBTTechnologiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_EmployeeRetentionAgreementTerm" abstract="false" name="EmployeeRetentionAgreementTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_InventoryAcquiredAndSubsequentlySold" abstract="false" name="InventoryAcquiredAndSubsequentlySold" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_NumberOfLargePowerProjects" abstract="false" name="NumberOfLargePowerProjects" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_AcquisitionsDispositionsAndDiscontinuedOperationsAbstract" abstract="true" name="AcquisitionsDispositionsAndDiscontinuedOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsAbstract" abstract="true" name="BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_BusinessAcquisitionProFormaEarningsPerShareAbstract" abstract="true" name="BusinessAcquisitionProFormaEarningsPerShareAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationContractLiabilitiesCurrent" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationContractLiabilitiesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SPXHeatTransferBusinessMember" abstract="true" name="SPXHeatTransferBusinessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DetectionandMeasurementReportableSegmentMember" abstract="true" name="DetectionandMeasurementReportableSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_PackageAndProcessCoolingEquipmentAndServicesAndEngineeredAirMovementAndHandlingSolutionsMember" abstract="true" name="PackageAndProcessCoolingEquipmentAndServicesAndEngineeredAirMovementAndHandlingSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_BoilerComfortHeatingAndVentilationMember" abstract="true" name="BoilerComfortHeatingAndVentilationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_UndergroundLocatorsInspectionAndRehabilitationEquipmentAndRoboticSystemsMember" abstract="true" name="UndergroundLocatorsInspectionAndRehabilitationEquipmentAndRoboticSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_CommunicationTechnologiesAidsToNavigationAndTransportationSystemsMember" abstract="true" name="CommunicationTechnologiesAidsToNavigationAndTransportationSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinAccountsReceivableNet" abstract="false" name="IncreaseDecreaseinAccountsReceivableNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomerAssetNetCurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerAssetNetCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomerLiabilityCurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerLiabilityCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomerLiabilityNoncurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerLiabilityNoncurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ContractwithCustomersNet" abstract="false" name="ContractwithCustomersNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomersNet" abstract="false" name="IncreaseDecreaseinContractwithCustomersNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_NumberOfCountriesInWhichEntitySellsItsProductsAndServices" abstract="false" name="NumberOfCountriesInWhichEntitySellsItsProductsAndServices" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_HVACMember" abstract="true" name="HVACMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DetectionAndMeasurementMember" abstract="true" name="DetectionAndMeasurementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SegmentReportingMember" abstract="true" name="SegmentReportingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_OtherForeignCountriesMember" abstract="true" name="OtherForeignCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LongLivedAssetsOfContinuingOperations" abstract="false" name="LongLivedAssetsOfContinuingOperations" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LongLivedAssetsOfDiscontinuedOperations" abstract="false" name="LongLivedAssetsOfDiscontinuedOperations" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReserves" abstract="false" name="RestructuringAndIntegrationReserves" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReservesPeriodExpense" abstract="false" name="RestructuringAndIntegrationReservesPeriodExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReservesSettledWithCash" abstract="false" name="RestructuringAndIntegrationReservesSettledWithCash" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReservesTranslationAndOtherAdjustment" abstract="false" name="RestructuringAndIntegrationReservesTranslationAndOtherAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ImmaterialAcquisitionMember" abstract="true" name="ImmaterialAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_GrossGoodwillRelatedToForeignCurrencyTranslationAndOther" abstract="false" name="GrossGoodwillRelatedToForeignCurrencyTranslationAndOther" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AccumulatedImpairmentsRelatedToForeignCurrencyTranslationAndOtherAdjustments" abstract="false" name="AccumulatedImpairmentsRelatedToForeignCurrencyTranslationAndOtherAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_GoodwillRelatedToForeignCurrencyTranslationAndOther" abstract="false" name="GoodwillRelatedToForeignCurrencyTranslationAndOther" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ASPEQHeatingGroupMember" abstract="true" name="ASPEQHeatingGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DefinedBenefitPlanBenefitObligationLossOnSettlement" abstract="false" name="DefinedBenefitPlanBenefitObligationLossOnSettlement" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ScheduleOfDebtInstrumentsTable" abstract="true" name="ScheduleOfDebtInstrumentsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_CurrentRevolvingSPXFacilitiesMember" abstract="true" name="CurrentRevolvingSPXFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_CurrentSPXTermLoanFacilitiesMember" abstract="true" name="CurrentSPXTermLoanFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_OtherBorrowingsMember" abstract="true" name="OtherBorrowingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DebtRollForward" abstract="true" name="DebtRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_DebtInstrumentPeriodicPaymentPercentageOfPrincipal" abstract="false" name="DebtInstrumentPeriodicPaymentPercentageOfPrincipal" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DomesticRevolvingLoanFacilityMember" abstract="true" name="DomesticRevolvingLoanFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_ForeignCreditInstrumentFacilitiesMember" abstract="true" name="ForeignCreditInstrumentFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_BorrowingsFromLifeInsurancePolicies" abstract="false" name="BorrowingsFromLifeInsurancePolicies" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LifeInsuranceCorporateOrBankOwnedInterestRate" abstract="false" name="LifeInsuranceCorporateOrBankOwnedInterestRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="spxc_InterestRateSwapThroughNovember2024Member" abstract="true" name="InterestRateSwapThroughNovember2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_InterestRateSwapFromDecember2024Member" abstract="true" name="InterestRateSwapFromDecember2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_MatureWithinOneYearMember" abstract="true" name="MatureWithinOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_RestrictedStockAndRestrictedStockUnitsMember" abstract="true" name="RestrictedStockAndRestrictedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_EquityAndStockBasedCompensationDisclosureAbstract" abstract="true" name="EquityAndStockBasedCompensationDisclosureAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_PerformanceSharesRestrictedStockandRestrictedStockUnitsMember" abstract="true" name="PerformanceSharesRestrictedStockandRestrictedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_IndexTypeAxis" abstract="true" name="IndexTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_IndexTypeDomain" abstract="true" name="IndexTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_PeerGroupWithinSP600SmallCapCapitalGoodsIndexAndSP400MidCapCapitalGoodsIndexMember" abstract="true" name="PeerGroupWithinSP600SmallCapCapitalGoodsIndexAndSP400MidCapCapitalGoodsIndexMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsTotalShareholderReturnCorrelation" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsTotalShareholderReturnCorrelation" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityPeriodBasedOnHistoricalVolatility" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityPeriodBasedOnHistoricalVolatility" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateCalculationPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateCalculationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_BlackScholesOptionPricingModelTable" abstract="true" name="BlackScholesOptionPricingModelTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_BlackScholesOptionPricingModelLineItems" abstract="true" name="BlackScholesOptionPricingModelLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_OtherLongTermLiabilitiesMember" abstract="true" name="OtherLongTermLiabilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LargePowerProjectsMember" abstract="true" name="LargePowerProjectsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ResolutionOfDisputeWithFormerAgentMember" abstract="true" name="ResolutionOfDisputeWithFormerAgentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_SiteContingencyNumberOfSites" abstract="false" name="SiteContingencyNumberOfSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible" abstract="false" name="SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccruedNet" abstract="false" name="UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccruedNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SigmaOmegaMember" abstract="true" name="SigmaOmegaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
