Low voltage wiring types

[Inspectorcliff]

I have a R.E.C. (registered electrical contractor) who is trying to find the proper stranded cable, other than nmb, to tie his secondaries of his low voltage lighting transformers to the low voltage lighting fixtures, any suggestions??
Thanks.

 

[Inspectorcliff]

411.3

411.3

Listing items yes, I am thinking that when he purchases the system that he should be able to purchase the wire that is listed at the same time. What do you think???:smile:

 

[tom baker]

If its an Art 411 installation, then its a system and whats installed is per the mfgs instructions

 

[Dennis Alwon]

If it is low voltage from a remote transformer the EC will not be able to conceal the low voltage wire. I have not seen any that can be concealed for this situation. I will usually run a piece of carfllex or metal flex with high voltage stranded wire in it.

We run into this issue often with LV undercabinet puck lights. The manufacturer often includes the wire but it may not be concealed.

To conceal the wire you must use wire that is accepted in Chapter 3

 

[LarryFine]

I will usually run a piece of carfllex or metal flex with high voltage stranded wire in it.

Is there any reason 3/8" couldn't be used? 1/2" is so massive for a single pair of conductors.

 

[Dennis Alwon]

Is there any reason 3/8" couldn't be used? 1/2" is so massive for a single pair of conductors.

Other than I never use that size I guess you could, however, with heavy loads and large distances you need to have larger conductors. I often run #10 stranded in the flex. Might be hard to do with 3/8"

 

[LarryFine]

I often run #10 stranded in the flex. Might be hard to do with 3/8"

According to Table C5, 3/8" LFNC can contain three THHW/THHN/THWN (etc) #10's.

Do you terminate the Carflex, i.e., connectors, into boxes, etc., or just use it as a sleeve?

 

[Dennis Alwon]

According to Table C5, 3/8" LFNC can contain three THHW/THHN/THWN (etc) #10's.

I wouldn't want to pull t long a run with that but you only need 2 #10 so that may work.

Some of the ones I have done had to go about 40 feet with 300 watt load so I pulled a #8. Crazy maybe but no problems with the lights.

Do you terminate the Carflex, i.e., connectors, into boxes, etc., or just use it as a sleeve?

I should have been more specific.

When I wire low voltage tracks with remote transformer I install a standard JB. The carflex terminates into the box.

I believe you would have to terminate in a JB unless the wire is exposed where it comes out of the wall.