NEC 2002

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ronniecouch

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Hi everyone,
I'm new here so please bear with me .I have a few questions that came up at work that I just can't find the answers .
1.What is the required distance between stage lights ?
2.What is the required distance between wire troughs?
3.When can incandescent lights be used without therimal protection ?
4.What class is a 55 gallon oil drum in ?
5.What amperage can an industrial receptacle thats not in use be ?
6.How many seconds does it take to trip a GFCI ?
I have searched everywhere . Thanks for your help.
thanks,ronniecouch
 
Re: NEC 2002

Ronnie,

Your profile says you're a building inspector.
Do you mean building codes or more like a home inspector?
Are these some kind of test questions?
 
Re: NEC 2002

Ronnie when You post several at the same time You may or may not get a thesis. As far as gfi Celtic gave the resources. Stage lights Article 520 I am under 05' NEC sorry! Wiring trough are You refering to The lamp holder distance from trough 1/2" ? Are you refering to recessed incandescent thermal protection ? 410.65
 
Re: NEC 2002

Ronnie forgot to add Bare bulbs or back stage lamps min. 2" apart 520.47 05' NEC and The 55 gal oil drum. I think that is class 1 Article 500 or the one siting in front of My garage full of trash The neighbors think I am "LOOOOO...Class"
 
Re: NEC 2002

Thanks all, just trying to answer some questions at work.
I have been a building inspector for 11 months. So I'm just starting to learn about this field.
thanks,ronnie
 
Re: NEC 2002

Originally posted by celtic:
Originally posted by ronniecouch:

6.How many seconds does it take to trip a GFCI ?
I have searched everywhere . Thanks for your help.
thanks,ronniecouch
Click to expand...
I doubt you looked everywhere....

http://www.codecheck.com/gfci_principal.htm

http://www.ul.com/regulators/ode/0201.pdf

Yeah, I know - I took the easy one :) .
Click to expand...
Hmmm, guess I missed it, but I didn't see the time in either link. Being curious, I did look at several manufacturer's GFCI specs and found that most of them said their GFCI's would trip in a nominal 25ms. In fact, the correct answer is: "it depends".

There is a response time curve, so that the greater the fault current the faster the GFCI must trip. At low fault currents, approaching the 5ma at which a GFCI is supposed to trip, the time may be much greater than 25ms. My new tester can measure how long it takes for a GFCI to trip, so I measured some. The timevaried dramatically by manufacturer. One set was right at 145ms, which another set from another mfg was right at 30ms when the fault current was ~6.7 ma.

Very interesting.
 
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