Code Question

[sgtsparky]

NM cable is permitted for temporary installations.

Code ref please,

 

[roger]

Uses permitted 334.12 one and 2 family dwellings and there attached or detached garages or storage buildings,

334.12 is uses not permitted and nowhere in 334.12 is it prohibited in commercial installations, that is backed up by 334.12(A)(2). If it was not allowed in commercial installations 334.12(A)(2) would not be necessary.

 

[roger]

Code ref please,

590.4(C)

 

[MyCleveland]

590.4(C)

Roger

"Alwayslearningelec" original post was about moving a food warmer to a different "temporary" location. I wouldn't think a commercial kitchen item that would be in USE by staff operation could be wired in a temporary method per 590.

Is this article not for mostly construction temporary use?

Who makes the call on 590.2(B)....the AHJ or his EI?
Did installer "Alwayslearningelec" get this approval.

 

[roger]

Temporary wiring can be used by anyone, where it's used would be subject to the AHJ's rules and permitting.

 

[J2H]

Looking at the requirements of the unit it indicates that is is 3 phase four wire, so unless special NM was purchased there were likely some violations. Perhaps the ground and the neutral were tied together and placed current on the EGC for the feed to the disconnect. High resistance somewhere could started a fire, but that is all speculation without more details as other posts noted.

 

[infinity]

Looking at the requirements of the unit it indicates that is is 3 phase four wire, so unless special NM was purchased there were likely some violations.

4 wire NM cable is a stock item in many places including NYC.

 

[macmikeman]

The fire might have been caused by physical damage to non- metalic cable. There are so many untrained people who have no idea of what regards you need to extend to open exposed nm cables. Carpenters don't seem to understand how the wire doesn't like abuse, and perhaps there are other non related trades or personnel in the area who are not so smart when it comes to nm cable. So foot traffic of the untrained in electrical distribution possibly factors in to this fire. So therefore even in temporary construction conditions I won't run exposed "romex".
Next question is the 25 foot length added enough to cause voltage drop on the circuit , which will cause heating issues? We don't know what the original installation length is. And does it run thru exposed to sunlight or other heat source areas?

 

[roger]

4 wire NM cable is a stock item in many places including NYC.

Same here.

 

[infinity]

Next question is the 25 foot length added enough to cause voltage drop on the circuit , which will cause heating issues?

Since this is a warmer VD shouldn't cause any heating issues with the cable. Lower voltage at the appliance would mean less current draw on the cable. It would be nice if the posters in the OP would get back to us with some further details.

 

[lordofthisworld]

Why didn't u just used a Jb and extended the branch circuit with #8's then load out with 10's like the original install and charge them accordingly?