Temp

[sdnoga]

I need to feed a couple of construction trialers for about 2 months can I use romex overhead from service box to trailer panel Job is in brooklyn ny

 

[allenwayne]

Re: Temp

I left bklyn.in 83 and at that time NM was not permited to be used as a wiring method for anything. ( not sure if things have changed )
But the very idea to use it like triplex is well lets say scary to say the least.

 

[petersonra]

Re: Temp

why is that scary?

it's no worse than a lot of other methods I have seen used, and it is allowed in the code for temp wiring inside.

 

[iwire]

Re: Temp

I suggest UF or SE.

 

[jimwalker]

Re: Temp

Just simply no way i would do this.Maybe UF barried or sleeved in conduit for protection and lay it on the ground if not in an area of construction.Just how many feet are we talking about ?

 

[iwire]

Re: Temp

Originally posted by jimwalker:
Just simply no way i would do this.

Jim we often go overhead to job trailers, we first pull a nylon rope between the points then tie wrap the SE to that.

Just make sure your points of attachment are up to it.

 

[websparky]

Re: Temp

Don't forget 225.18 requires 18' ground clearance for these overhead spans!!

 

[pierre]

Re: Temp

NYC is now referencing the NEC with approximately 300 amendments. They do have several amendments to temporary wiring. NM cable is permitted in NYC for temporary wiring.

527.2 or 590.2 requires that all other requirements for permanent wiring shall apply unless modified by this article.

As Dave has mentioned height requirements are to be followed. So are some of the requirements for NM, UF and SE.

UF cable is not permitted as an overhead cable, unless installed with a messenger - 340.12(11), that messenger is required to be a wire as per 396.2
The same requirement is for SE cable as per Table 396.10(A). Don't forget about 396.60 Grounding.

Your best bet between the trailers is a messenger type such as triplex.
Also don't forget about groundrods...


I understand this is a temporary installation, but the current in those conductors do not know it is only temporary and will still injure or kill someone.

How many times have I heard "Pierre its only temporary"

WELL, A CONSTRUCTION WORKER WAS ELECTRICUTED LAST WEEK IN NYC DUE TO IMPROPER TEMPORARY WIRING!!!!!!!!!!!!!!!!

DEATH IS NOT TEMPORARY


P.S. Do you think the insurance inspectors are not building a case against the electrical contractor for that death. ALL violations, flagrant or not will be used against the contractor in court.

 

[iwire]

Re: Temp

Originally posted by pierre:
527.2 or 590.2 requires that all other requirements for permanent wiring shall apply unless modified by this article.

As Dave has mentioned height requirements are to be followed. So are some of the requirements for NM, UF and SE.

UF cable is not permitted as an overhead cable, unless installed with a messenger - 340.12(11), that messenger is required to be a wire as per 396.2
The same requirement is for SE cable as per Table 396.10(A). Don't forget about 396.60 Grounding.

Dave and Pierre you are such hard liners.

You can not stop at 527.2 you must look at all of 527.

527.4(J) changes the support requirements for flexible cables and cords.

527.4(J) Support. Cable assemblies and flexible cords and cables shall be supported in place at intervals that ensure that they will be protected from physical damage. Support shall be in the form of staples, cable ties, straps, or similar type fittings installed so as not to cause damage. Vegetation shall not be used for support of overhead spans of branch circuits or feeders.

Here is the Handbook commentary (2002)

Per 527.4(J), temporary wiring methods do not have to be supported in accordance with the permanent installation requirements (from Chapter 3) for the particular wiring method. It should be noted the temporary wiring must be removed upon completion of construction and adequate support is needed only to minimize the possibility of damage to the wiring method during its temporary period of use. It is not permitted to use vegetation as a support structure for overhead spans of branch-circuit and feeder conductors.

I will stick with my nylon rope messenger supporting SER.

[ October 08, 2005, 06:30 AM: Message edited by: iwire ]

 

[pierre]

Re: Temp

Sticks and stones will break my bones, but words will never hurt me

I've been called worse Bob - I know it is early, you probably did not have your coffee yet , and experience in seeing what happens to it over time is crucial to making sure it will be a safe installation.

590.2(B)Approval
...only if approved based on the conditions of use and any special requirements of the temporary installation.

 

[iwire]

Re: Temp

Originally posted by pierre:
Sticks and stones will break my bones, but words will never hurt me

[ October 08, 2005, 08:10 AM: Message edited by: iwire ]

 

[websparky]

Re: Temp

Bob,

I don't have a problem with the method of support as you have described it. However, I do not approve NM for overhead outside conductors!

NM used indoors and supported in the usuall temp fashion is fine by me as long as the pinch points, sharp edges and sharp turns are avoided.

 

[iwire]

Re: Temp

Originally posted by websparky:
However, I do not approve NM for overhead outside conductors!

I agree Dave, I suggested UF or SE in place of NM

 

[neal]

Re: Temp

code 550.4 and 550.10 feeder needs to have 4 wires and ground needs to be insulated