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Friday, June 24, 2022
Question:
Good Morning thanks for all the CQD info. It keeps me thinking for sure!!! My question is in reference to 300.6(1) (1) "Protected from Corrosion Solely by Enamel. Where protected from corrosion solely by enamel, ferrous metal raceways, cable trays, cable bus, auxiliary gutters, cable armor, boxes, cable sheathing, cabinets, metal elbows, couplings, nipples, fittings, supports, and support hardware shall not be used outdoors or in wet locations as described in 300.6(D)." My question is this. almost EVERY installation I have installed (other than on the ocean areas or subject to corrosive environments) all are enamel painted and never called by the AHJ. Why is this article in the code if we consistently install NEMA 3R or similar type equipment that is painted and not stainless steel and not called on it? Or has the enamel changed to where it does provide enough protection now? I am sure most everyone on your list here has seen meter boxes, panels etcetera rusted out... Just trying to do the right thing here-
Thanks again,
Chris Fink
A
Answer:
Hi Chris,
Thanks for the question. The environment in which electrical equipment is being installed must be carefully assessed to determine the risk of damage to equipment from corrosion and other destructive environmental elements. Your point is a good one. Often the wrong equipment is installed out of habit and little consideration is given to the corrosive influences. There are other forces at work here too, such as the cost of installing the appropriately rated equipment. Inspectors must be diligent in their interpretation and approval processes to intervene when necessary to keep equipment from suffering damage shortened life expectancy from corrosive influences. Replacement equipment for rusted-out equipment should not be like for like, it should be the properly rated equipment for the environment. Otherwise, the same thing will happen again. To replace like for like is not the appropriate solution.
Thanks for the question.