is this legal?

[Copperclad]

Im thiking this is not right.......can you attach a branch ckt. conduit from a run of bus duct?
Im sure the duct would support the weight of this lil 3/4" conduit, but it sure don't feel right.

 

[Jim W in Tampa]

what size wire and how fused

 

[Copperclad]

The bus duct system is 1000a 480 volt
We are looking to attach (via beam clamps on the lower lip) a 3/4" emt for misc. 20 amp branch ckts.

 

[Chris6245]

So, I'm just taking a shot here. The conduit and branch circuit don't originate from the buss duct, you just want to use the buss duct as a means of support?

 

[Copperclad]

Yes Chris,,,,,just like that!
sorry to be so vague

 

[Jim W in Tampa]

OK guess i read to much into this. No i don't think using it as support is ok. Probably can hold it but how to we arrive at what it it can hold ? 1/2 , 3/4 , 1 , etc i think bad idea and pretty sure one sytstem can't support the other. I WIRE will be her shortly with number.

 

[iMuse97]

It just doesn't seem right. Can't find anything specific that says you can't do it.

 

[Chris6245]

Not sure of code section but my first thought is no. But I think you would be able to use the threaded rod that supports the buss duct to support your conduit. Or even clamp to the brackets that hold the duct.

 

[Sierrasparky]

Not sure of code section but my first thought is no. But I think you would be able to use the threaded rod that supports the buss duct to support your conduit. Or even clamp to the brackets that hold the duct.

I like your Idea.

 

[tkb]

I wouldn't support the conduit from the buss duct, I would use the buss duct supports to hang from.

 

[jeremysterling]

The bus duct system is 1000a 480 volt
We are looking to attach (via beam clamps on the lower lip) a 3/4" emt for misc. 20 amp branch ckts.

Tek screws and 1h straps might be a bad idea

 

[Pierre C Belarge]

Buss Duct:
Article 100
"Raceway. An enclosed channel of metal or nonmetallic materials designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this Code.
...and busways."

Article 368 - Busways
Electricians generally call busways - busduct. Busduct is covered in Article 368, Busways.

300.11(B) Raceways Used as Means of Support.


In general, raceways are not permitted as a means of support.

 

[Pierre C Belarge]

Im thiking this is not right.......can you attach a branch ckt. conduit from a run of bus duct?
Im sure the duct would support the weight of this lil 3/4" conduit, but it sure don't feel right.

See 368.56(A)

 

[Chamuit]

I wouldn't support the conduit from the buss duct, I would use the buss duct supports to hang from.

That's what I'd do. Also, checking on the listed weight that the supports can hold wouldn't be a bad idea.

 

[Copperclad]

Thanks everyone for your help, I wil try to enlighten my boss on this matter.

 

[iMuse97]

Thanks everyone for your help, I wil try to enlighten my boss on this matter.

No doubt, it seems easy at the time to mount the raceway (3/4" conduit) to the other raceway (busduct), but this method is eventually a problem, when the supporting system needs modification and the supported system is intended to remain in place.

I said it didn't seem right; you thought so from the start, and now you've got Pierre CB giving you the basic code info. that says it is not permitted. Case closed--or not as your boss determines. I've been in that situation, too... not so much anymore b/c I'd be arguing with myself. Good luck.