temp wiring with NM

[brentp]

I'm curious to know how folks support NM for temp wiring on their jobsites.

Most of the general contractors' "safety inspectors" in my area say that NM can not be supported by metallic means, period, sharp edge or otherwise. Does anyone know an OSHA or NEC reg that supports their position? I can't find one, nor can they. These "safety inspectors" want the NM supported by cable ties or an insulated wire. How in the world can you isolate temp wiring from all the metal in a commercial building? I think the outer sheath of NM is sufficient.

NM can still be damaged by these methods, thus exposing the 'hot' wire with no way of shorting and allowing for workers to come in physical contact with this wire. How much can you really trust the GFCI recept? Yeah I test 'em once a week, and usually find one that's not operational. Not to mention that temp lighting is not GFCI protected.

In my mind it seems as though NM should be supported by a metallic means so IF the cable is damaged at least is has a better chance to trip the breaker or GFCI.

Someone please set me straight, or give me some ammo for the safety inspectors. This 'battle' is getting old. I need to get right or have something in writing to help nip this in the bud once and for all.

Thanks
Brent

 

[iwire]

Re: temp wiring with NM

I can not give you a code reference off the top of my head.

I can tell you that the company I work for will not even accept insulated wire as the support for NM temps.

The only product we use is pull string and we support the cable and the socket separately.

In areas where contact with metal is likely we use the plumbers pipe insulation around the NM cable. The black insulation used for cold pipes or the fiberglass used for hot pipes.

I have always been told it is a requirement, considering we are already being allowed to use NM in place of rubber cord I don't think the extra effort to protect it is a big deal.

Price the same job using all cord.

Bob

 

[brentp]

Re: temp wiring with NM

I have always been told it is a requirement, considering we are already being allowed to use NM in place of rubber cord I don't think the extra effort to protect it is a big deal.

Thanks for your input Bob, but I'm looking for the "requirement" you spoke of above. With all due respect, miles of plumbing insulation does become a big deal.

Brent

 

[jimwalker]

Re: temp wiring with NM

It is smarter to use jetline or plastic tie wraps.Not only safer but fast to remove.On a job right now that using some old drop in 2 x 4 fixtures and the inspectors been there 3 times and never said a word even tho they not grounded.OSHA would have plenty to say about it but they never show till someone gets killed