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IEC 60423 3rd Edition, August 1, 2007
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Conduit systems for cable management – Outside diameters of conduits for electrical installations and threads for conduits and fittings
Additional Comments: BILINGUAL
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This International Standard specifies outside diameters for conduits used in electrical installations and the dimensional requirements for threads. It also specifies the dimensional requirements for threads used in associated fittings.

It is not applicable to extra-heavy duty rigid steel conduits specified in IEC 981.