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  <xs:element id="spxc_DebtInstrumentCollateralPercentageofCapitalStockofDomesticSubsidiaries" abstract="false" name="DebtInstrumentCollateralPercentageofCapitalStockofDomesticSubsidiaries" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <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_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentAbstract" abstract="true" name="DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_NonEmployeeDirectorMember" abstract="true" name="NonEmployeeDirectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_NumberOfCountriesInWhichEntitySellsItsProductsAndServices" abstract="false" name="NumberOfCountriesInWhichEntitySellsItsProductsAndServices" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <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_CincinnatiFanMember" abstract="true" name="CincinnatiFanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitUncertainTaxPositionAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitUncertainTaxPositionAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LegacySPXMember" abstract="true" name="LegacySPXMember" 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_SeniorCreditFacilitiesMember" abstract="true" name="SeniorCreditFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_TransformerSolutionsMember" abstract="true" name="TransformerSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <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_CustomerBacklogMember" abstract="true" name="CustomerBacklogMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTaxMember" abstract="true" name="DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTaxMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <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_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMember" abstract="true" name="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_BuildingsAndLeaseholdImprovementsMember" abstract="true" name="BuildingsAndLeaseholdImprovementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ScheduleOfDebtInstrumentsTable" abstract="true" name="ScheduleOfDebtInstrumentsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitForeignTaxWithholdingAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitForeignTaxWithholdingAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SeniorCreditAgreementRange1Member" abstract="true" name="SeniorCreditAgreementRange1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SecuredOvernightFinancingRateSOFRPeriodTwoMember" abstract="true" name="SecuredOvernightFinancingRateSOFRPeriodTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_PaymentForDivestiture" abstract="false" name="PaymentForDivestiture" 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_AssetsOfAbandonedEntities" abstract="false" name="AssetsOfAbandonedEntities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_AccountsReceivableAndOtherAssetsWriteOff" abstract="false" name="AccountsReceivableAndOtherAssetsWriteOff" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DebtInstrumentNumberOfDrawings" abstract="false" name="DebtInstrumentNumberOfDrawings" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <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_UndergroundLocatorsInspectionAndRehabilitationEquipmentAndRoboticSystemsMember" abstract="true" name="UndergroundLocatorsInspectionAndRehabilitationEquipmentAndRoboticSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DebtInstrumentFeePercentage" abstract="false" name="DebtInstrumentFeePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_NumberOfDisputes" abstract="false" name="NumberOfDisputes" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <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_SensorsSoftwareIncMember" abstract="true" name="SensorsSoftwareIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ITLMember" abstract="true" name="ITLMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types: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_InterestRateSwapThroughNovember2024Member" abstract="true" name="InterestRateSwapThroughNovember2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationSettlementCharges" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationSettlementCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_NumberOfLargePowerProjects" abstract="false" name="NumberOfLargePowerProjects" nillable="true" xbrli:periodType="duration" 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_ULCRoboticsMember" abstract="true" name="ULCRoboticsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1: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_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentGross" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentGross" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SecuredOvernightFinancingRateSOFRPeriodThreeMember" abstract="true" name="SecuredOvernightFinancingRateSOFRPeriodThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <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_BorrowingUnderTradeReceivablesAgreement" abstract="false" name="BorrowingUnderTradeReceivablesAgreement" 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_IncreaseDecreaseinContractwithCustomerAssetNetCurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerAssetNetCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DefinedBenefitPlanBenefitObligationSettlementsAndActuarialGainLoss" abstract="false" name="DefinedBenefitPlanBenefitObligationSettlementsAndActuarialGainLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BusinessCombinationReductionInEstimatedLiability" abstract="false" name="BusinessCombinationReductionInEstimatedLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_AcquisitionsAndDiscontinuedOperationsAbstract" abstract="true" name="AcquisitionsAndDiscontinuedOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsConsolidatedLeverageRatio" abstract="false" name="DebtInstrumentCovenantTermsConsolidatedLeverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_SeniorCreditAgreementRange3Member" abstract="true" name="SeniorCreditAgreementRange3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_BoilerElectricalHeatingAndVentilationMember" abstract="true" name="BoilerElectricalHeatingAndVentilationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SecuredOvernightFinancingRateSOFRMember" abstract="true" name="SecuredOvernightFinancingRateSOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_IncreaseDecreaseinContractwithCustomerLiabilityCurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerLiabilityCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" 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:schema>
