Isaiah
Senior Member
- Location
- Baton Rouge
- Occupation
- Electrical Inspector
In this waste-water treatment plant, there's a very long corridor running below aeration ponds which appears to be about 300 feet in length by 10 feet high and 15 feet wide. It seems to be well ventilated. A 4" Natural Gas line runs the entire length of the corridor and several combustible gas detectors are strewn along the way. None of the equipment is rated for CID2, i.e. no conduit seals, Nema 7 enclosures etc. (Plant was built in the 50's - cant even find area classification dwgs)
I believe NEC 500.7(K) applies and the corridor can be declassified - any comments?
I believe NEC 500.7(K) applies and the corridor can be declassified - any comments?