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My firm has been performing Arc Flash Hazard analysis for our customers. I have heard that new evaluations must be performed every two years and the Arc Flash labels will expire after that time. If this is true, could anyone tell me which code governs this and/or where I may find this...

The booth is existing, but it was not "pre-manufactured". It also has some explosion proof lights on one side of the room, but not on the ceiling (which they want) or on the other wall. I'm not sure why they did this. We actually have to redo all the electrical in the booth, and there is also...

I have looked in the NEC and cannot find any codes for paint booths (or something similar) for lighting and panels, as far as explosion proof, etc. Can someone shed a light on this? Thanks. Ryan

...that was 2-3 pages, not chapters.

Thanks a lot for your help 25362...I actually found some of his old notes from college, and I figured it out (hopefully correctly). Morten, yes, you are correct, I have not had much training in heat transfer, as a lot of us EE's have not. My FE exam prep book only had 2-3 chapters on it as...

Can you get the fume hoods at Fry's or some other electronics store? I have been wearing a respirator mask, to no avail.

I was wondering if there is a type of solder that is non-allergenic. I am using Rosin solder (lead free), but it makes me very sick afterwards. It also must be lead-free.

No, this is NOT a homework problem...I graduated 2 years ago. This is not a typical problem I work on. I am trying to help out my co-worker whose actually out of town...all the information I have given is all he has given me. I've never done a heat trace. He was working on that part, and...

Sorry guys, I wasn't clear...I'm trying to determine what the exit temperature would be around. Any guidance is appreciated.

I am actually a EE, but I'm helping my co-worker who is a ME try to figure this out (I haven't had too much heat transer experience) ... We have a 25,000 ft long pipe with an O.D. of 18" and I.D. of 16.875". The temperature of the water inside the pipe is 65 degrees F, and the ambient...