use

[fireryan]

is it permitted to run a 3 wire use direct burial cable and then run a seperate ground in the trench to come up with a 4 wire? I looked in 338 and couldnt come up with anything

 

[480sparky]

Legal in my book.

As long as the ground wire is listed for DB.

 

[walkerj]

I say not compliant but am too lazy to research it any further

 

[Flex]

is the trench considered a raceway. I believe all the wires need to be in the same raceway. 300.3(b) seems to say trench.

 

[fireryan]

thats what I was sorta thinking to

 

[Flex]

Question would be how would you get them into the same raceway before leaving the trench.

 

[don_resqcapt19]

You can read the code section that applies to say that you can't use a separate EGC with the USE cable, or that you can.

300.3(B) Conductors of the Same Circuit. All conductors of the same circuit and, where used, the grounded conductor and all equipment grounding conductors and bonding conductors shall be contained within the same raceway, auxiliary gutter, cable tray, cablebus assembly, trench, cable, or cord, unless otherwise permitted in accordance with 300.3(B)(1) through (B)(4).

All of the circuit conductors would be in the same trench, but would not be in the same cable. It is my opinion that the separate EGC is a violation of this code section.

 

[Flex]

You can read the code section that applies to say that you can't use a separate EGC with the USE cable, or that you can.

All of the circuit conductors would be in the same trench, but would not be in the same cable. It is my opinion that the separate EGC is a violation of this code section.

I'm inclined to agree with you. But is this code really black and white or does it seem kind of gray. First time through I figured it be ok.

 

[480sparky]

I think he is asking about buying a 3-wire USE assembly, and adding a single grounding conductor in the same trench with it......NOT a seperate trench.

If so, I do that all the time.

 

[stew]

run this type of install all the time. trench is not a raceway in my opinion. we use 4/0 use and a #4 use ground all the time for trailers and mfg homes. also have used 2/2/4 use w a separate ground for garages and outbuildings when we can't find 2/2/2/4.

 

[Flex]

run this type of install all the time. trench is not a raceway in my opinion. we use 4/0 use and a #4 use ground all the time for trailers and mfg homes. also have used 2/2/4 use w a separate ground for garages and outbuildings when we can't find 2/2/2/4.

So in your opinion its against code?

 

[LarryFine]

You can read the code section that applies to say that you can't use a separate EGC with the USE cable, or that you can.

All of the circuit conductors would be in the same trench, but would not be in the same cable. It is my opinion that the separate EGC is a violation of this code section.

It does include "trench" and "or" in the list. I say compliant.

 

[iwire]

It does include "trench" and "or" in the list. I say compliant.

So based on that I could install GRC for some of the conductors and lay the others beside it?

 

[M. D.]

So larry ,.. would this , if it were in the trench also comply???

http://images.industryclick.com/files/31/412ecm11fig11.jpg

The use of the word "or" does denote a choice that whole list of things or cord.. ...wiring methods or a cord

 

[stew]

code compliant in my opinion no question.

 

[Flex]

code compliant in my opinion no question.

sorry misinterpreting your post.

 

[Flex]

So based on that I could install GRC for some of the conductors and lay the others beside it?

That is what I was trying to figure out. I guess in a trench you could? But I wouldnt think so.

 

[iwire]

That is what I was trying to figure out. I guess in a trench you could? But I wouldnt think so.

No in my opinion you can't I was just trying to point out that the EGC will have to be part of the cable assembly and not just laid near it.

 

[iwire]

code compliant in my opinion no question.

I would give it a red tag.

 

[fireryan]

I think he is asking about buying a 3-wire USE assembly, and adding a single grounding conductor in the same trench with it......NOT a seperate trench.

If so, I do that all the time.

thats exactly what im talking about. It seems to me that this could go either way