<SEC-DOCUMENT>0001179110-21-002647.txt : 20210303
<SEC-HEADER>0001179110-21-002647.hdr.sgml : 20210303
<ACCEPTANCE-DATETIME>20210303161557
ACCESSION NUMBER:		0001179110-21-002647
CONFORMED SUBMISSION TYPE:	3/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20201101
FILED AS OF DATE:		20210303
DATE AS OF CHANGE:		20210303

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Kumar Ankush
		CENTRAL INDEX KEY:			0001831606

	FILING VALUES:
		FORM TYPE:		3/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-06948
		FILM NUMBER:		21709151

	MAIL ADDRESS:	
		STREET 1:		C/O SPX CORPORATION
		STREET 2:		6325 ARDREY KELL ROAD
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28277

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SPX CORP
		CENTRAL INDEX KEY:			0000088205
		STANDARD INDUSTRIAL CLASSIFICATION:	METALWORKING MACHINERY & EQUIPMENT [3540]
		IRS NUMBER:				381016240
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		13320-A BALLANTYNE CORPORATE PLACE
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28277
		BUSINESS PHONE:		980-474-3700

	MAIL ADDRESS:	
		STREET 1:		13320-A BALLANTYNE CORPORATE PLACE
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28277

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SEALED POWER CORP
		DATE OF NAME CHANGE:	19880515
</SEC-HEADER>
<DOCUMENT>
<TYPE>3/A
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 3/A -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3/A</documentType>

    <periodOfReport>2020-11-01</periodOfReport>

    <dateOfOriginalSubmission>2021-02-19</dateOfOriginalSubmission>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000088205</issuerCik>
        <issuerName>SPX CORP</issuerName>
        <issuerTradingSymbol>SPXC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001831606</rptOwnerCik>
            <rptOwnerName>Kumar Ankush</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SPX CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>6325 ARDREY KELL ROAD, SUITE 400</rptOwnerStreet2>
            <rptOwnerCity>CHARLOTTE</rptOwnerCity>
            <rptOwnerState>NC</rptOwnerState>
            <rptOwnerZipCode>28277</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President, SPX Global Cooling</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8047</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">This Form 3/A is being filed solely to correct the amount reported in the Form 3/A filed on February 19, 2021, which was overstated by inadvertently including 1,351 shares that were delivered to the issuer for the payment of withholding taxes due upon the vesting of restricted stock units.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>John Nurkin, Attorney in Fact for Ankush Kumar</signatureName>
        <signatureDate>2021-03-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
