Cable Tray Wire?

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tomd53

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Can my contractor install a seperate netural along side a cable tray wire. He ordered a 4/c wire for 220/380v service to machines. It has to have a netural.It will run in a cable tray for 200' Is this ok or does the netural need to be encased inside the cable tray wire?
 
That would be a violation of 300.3(B).

He may be able to use the 4th conductor as a neutral (if it is sized properly) and use the cable tray as the grounding conductor per 392.3(C).
 
You didn't state the conductors wire size, I don't know if you made the exceptions in Article 310.10 (H), this is called out in Article 392.20(C). There is an extensive listing in the index on cable trays and there limits and applications.
 
This is in a factory in Mo. we have our machines built in Germany. They are 220/380v 60hz. We are moving to a new location. The small machines are 100 amp rated and use about 48 amps. They are running 3 #2 and a #4 ground. We need a neutral also for the 220v wich is 380v three phase to netural gives you 220v single phase They are using tray cabl but it was ordered wrong and he wants to pull a seperate #2 neutral along side. What do you think?
iceworm said:
Tom-
Where is this being installed? "220/380v" sounds suspiciously like it is 50HZ. I'm asking because I'm wondering if the NEC applies.

ice
Click to expand...
 
I don't think you can run the neutral in the manner described.

can you just run the 3 phase conductors and add D-Y xfmr at the end? might be cheaper than replacing the cable. I don't know that you can retask the green wire in the cable to be a neutral.

you may already have the transformer, maybe it can just be moved.
 
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My quote of an Article exist in 2011, the leading answer doesn't exit in 2011, 392.3(C).

But to qualify this; about the whole article was "Barred" in 2011. (IE the whole thing been re-written / rearranged)
 
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