Temporary Lighting Installation

[jselectricservs]

I have been asked to install temporary lighting on an ongoing construction site. NEC 590.4 C says we can use NM cable and no jboxes are needed for splicing. 590.4 G execptions. I believe i am reading this correctly but I dont want to under bid this if jboxes are needed.

Thank you All!

 

[Dennis Alwon]

I have never had to provide this but I found this in section 590.4(G). You should look into temp lights that are pre wired much like an extension cord with lights on them.

Splices
A box, conduit body, or other enclosure, with a cover installed, shall be required for all splices.
Exception No. 1:
On construction sites, a box, conduit body, or other enclosure shall not be required for either of the following conditions:

• (1)
  The circuit conductors being spliced are all from nonmetallic multiconductor cord or cable assemblies, provided that the equipment grounding continuity is maintained with or without the box.
• (2)
  The circuit conductors being spliced are all from metal-sheathed cable assemblies terminated in listed fittings that mechanically secure the cable sheath to maintain effective electrical continuity.

Exception No. 2:
On construction sites, branch-circuits that are permanently installed in framed walls and ceilings and are used to supply temporary power or lighting,and that are GFCI protected, the following shall be permitted:

• (1)
  A box cover shall not be required for splices installed completely inside of junction boxes with plaster rings.
• (2)
  Listed pigtail-type lampholders shall be permitted to be installed in ceiling-mounted junction boxes with plaster rings.
• (3)
  Finger safe devices shall be permitted for supplying and connection of devices.

 

[infinity]

We use NM cable with open splices covered in electrical tape. Boxes are not required.

 

[jselectricservs]

I have never had to provide this but I found this in section 590.4(G). You should look into temp lights that are pre wired much like an extension cord with lights on them.

View attachment 2567021

The location is a big commercial property, with 4 - 350 ft runs at a 35ft height. The plan is to install NM cable and some highbays with guards.
Thanks.

 

[jselectricservs]

We use NM cable with open splices covered in electrical tape. Boxes are not required.

Thank you for confirming, this is very helpful.
Thanks!

 

[Todd0x1]

The location is a big commercial property, with 4 - 350 ft runs at a 35ft height. The plan is to install NM cable and some highbays with guards.
Thanks.

Have you looked at the temp fixtures designed to be hardwired. These can be had for a reasonable price in bulk

200W PREFAB LED OVERHEAD | Southwire

www.southwire.com

 

[jselectricservs]

Have you looked at the temp fixtures designed to be hardwired. These can be had for a reasonable price in bulk

200W PREFAB LED OVERHEAD | Southwire

www.southwire.com

We ended up using some old highbay fixtures we had. appreciate the recommendation!

 

[mtnelect]

This reminds me of the Kanan Dume Road Tunnel that was being built from the 101 Hwy to Malibu. I was working as an apprentice with the Los Angeles County Department of Public Works. The county was using jail trustees as laborers. They were boring two parallel tunnels, called barrels, one for Northbound and one for Southbound. They were using boring platforms similar to Metrorail tunnels. As they progressed through the mountains, we provided a lighting system that consisted of open wiring with rubber covered sockets with leads that we tied into the open wiring on the side of the tunnels. As they progressed through the mountains, we had to go back weekly to extend the lighting.