Category: Corrosion

The Inside Story of Steel Conduit and Tubing

Requirements for coatings on steel rigid metal conduit (RMC), intermediate metal conduit (IMC) and electrical metallic tubing (EMT) are included in the UL product standards as well as in the ANSI C80 standards for conduit and EMT. The National Electrical Code requires that these products be listed (see NEC sections 344.6, 342.6 and 358.6, respectively).[…]

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What is Corrosion?

December 5, 2014 / 0 comments / in Corrosion / by:

The 1965 edition of the National Electrical Code® (NEC®) added the requirement that “raceways be suitable for the corrosive environment to which it is exposed.” Section 300.6, Protection Against Corrosion and Deterioration, requires that, “Raceways, cable trays, cable bus, auxiliary gutters, cable armor, boxes, cable sheathing, cabinets, elbows, couplings, fittings, supports and support hardware shall[…]

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Protecting Field-cut Threads Against Corrosion

September 26, 2014 / 0 comments / in Corrosion / by:

Factory-cut threads receive a corrosion-protection coating at the factory, but what about field-cut threads? Section 300.6(A) of the NEC says, “Where corrosion protection is necessary and the conduit is threaded in the field, the threads shall be coated with an approved electrically conductive, corrosion-resistant compound.” The 2014 edition of the NEC added an Informational Note[…]

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