Power in cable tray

Status
Not open for further replies.
K

karn

Senior Member
Location
United States
Occupation
Electrician
I never used power in a cable tray before And I'm unsure how to do it correctly, a third-party contractor installed power poles and a cable tray for the cash registers, the power poles have a 1/2inch (for data) and 3/4inch (for 120v) coming out of the top of the poles and drop into a nearby cable tray (with divider), my power HR boxes are near the cable tray,

Should I stub a conduit down from my box towards the cable tray and free wire THHN in the tray ?
 
How far from your HR box to power poles?

The reason I ask is because by the time you get proper rated cable (Type TC) drop conduit and adapt to tray then run to [assuming] already adpated to conduit at other end and down the pole, it may be less costly to you to just run conduit all the way to the poles and pull THHN.

:slaphead:
 
Smart $ said:
How far from your HR box to power poles?

The reason I ask is because by the time you get proper rated cable (Type TC) drop conduit and adapt to tray then run to [assuming] already adpated to conduit at other end and down the pole, it may be less costly to you to just run conduit all the way to the poles and pull THHN.

:slaphead:
Click to expand...

So I need type TC wire to free wire in the tray? The HR boxes are all about 10ft from the tray, I suppose I could always change the EMT over to flex with some rigid couplings and connect the two pieces of flex together with another rigid coupling, or remove their flex all together to go straight into the pole, or maybe there's a better way altogether, also how much more does TC cost? Maybe I'll just get some,
 
karn said:
So I need type TC wire to free wire in the tray? [Not specifically but common. There are other approved wiring methods permitted in cable tray. See 392.10(A)] The HR boxes are all about 10ft from the tray [But how far from HR box to poles???], I suppose I could always change the EMT over to flex with some rigid couplings and connect the two pieces of flex together with another rigid coupling, or remove their flex all together to go straight into the pole (ding ding ding if not too far, or perhaps use MC) or maybe there's a better way altogether, also how much more does TC cost? Maybe I'll just get some,
Click to expand...
Reply with quote.
 
Yeah, that's probably what I will do, just curious if I were to use TC wire could I use regular wire nuts to make splices in a power tray?
 
karn said:
Yeah, that's probably what I will do, just curious if I were to use TC wire could I use regular wire nuts to make splices in a power tray?
Click to expand...
Why would you make splices in the tray? You are permitted to make splices in tray without a box, but what you run into or out of the tray has to be permitted in the tray to make the splices there. Normally the TC cable is just run through raceway to a box or other termination enclosure.
 
Splices as if multiple registers share a circuit, I looked up the TC , it looks like SO cord, do they make loose (single conductor) wires for trays?
 
karn said:
Splices as if multiple registers share a circuit, I looked up the TC , it looks like SO cord, do they make loose (single conductor) wires for trays?
Click to expand...
Yes, but I doubt you'll find any single conductor cables in the smaller sizes (<1/0).

Sounds more and more like you should just run it in raceway and install boxes at splice points. You can even run the raceway in the tray for support. :D
 
What not just set a 12x12 and run tray cables from the j box down each power pole and splice in the jbox? If the tray is there why not use it. Tray cable is cheap.

Sent from my SM-N900V using Tapatalk
 
As far as the single conductors option, doesn't sound like this is an industrial establishment so I would say nix the single conductor option. [392.10(A) and (B)]

I would go with the raceway option or Type MC Cable option is their specifications permit it or Type TC as well.
 
I would suggest MC or AC cable. Readily available and will work just fine. No need for separation.
A cable tray is a support system and you are not required to use TC in CT.
 
Status
Not open for further replies.
Top