Question on using standard 8-3 romex for 12 volts???

[jango]

Is it ok to use standard 8-3 (non-metalic sheathed romex with ground) for low voltage wire in a residence? Basically for the 12V (secondary) side of a magnetic transformer for Monorail lighting in a kitchen ceiling. Any feedback or code references would be greatly appreciated.

 

[infinity]

Take a look at 411.5(D)(3).

 

[Dennis Alwon]

I have used 8/3 seu for low voltage track lighting. There is no issue with that as long as the wiring terminates in a jb.

 

[curt swartz]

I agree there is no issue but why use 8-3 instead of 8-2?

 

[ActionDave]

I agree there is no issue but why use 8-3 instead of 8-2?

8-2 would be a special order item for me.

 

[curt swartz]

8-2 would be a special order item for me.

I'm surprised. 8-2 and 6-2 is very common in my area. Mostly used for A/C units.

 

[ActionDave]

I wanted some 6-2 for that reason. Talking to the supply houses was just like that scene in Oh Brother Where Art Thou- "It'll take two weeks."

 

[Dennis Alwon]

8/3 would be for a 2 circuit track. I used 8/2 nm but wrote 8/3 without thinking since the OP wrote it.

 

[stickboy1375]

I'm surprised. 8-2 and 6-2 is very common in my area. Mostly used for A/C units.

I agree, although, those are some pretty big units... usually ends up being 3-4 smaller units for zoning purposes...

 

[kwired]

The problem with low voltage lighting is voltage drop. If you have a 12 volt system a one volt drop is a little over 8% - it will be noticeable. It does not take nearly as long of a run at 12 volts to have excess drop as it takes at 120 volts or more. Also remember the current is 10 times higher than it is for same load at 120 volts, which adds to the voltage drop problems. The key is to locate the 12 volt supply as close as practical to the load.

 

[infinity]

I agree, although, those are some pretty big units.....

Big units or sparkies who like to wire according to the maximum OCPD size. hmy:

 

[stickboy1375]

Big units or sparkies who like to wire according to the maximum OCPD size. hmy:

Yep... My boss made me run #10 for a 21 amp split unit the other day... ugh...