conduit

[Dave Maxwell]

What size conduit for 3 conductor 2ot and one #4 copper? 2 inch

 

[rkevins]

2" is good for 6 - 2/0 for rigid pvc per Ugly's 2008 edition

 

[wyliesdiesels]

You didn't specify what type of wire(AL, CU, compact, regular)...But my 2011 Ugly's book says 5 for regular Al and Cu!

 

[pattenp]

Also depends on wire type, not just size.

 

[Dave Maxwell]

2ot aluminum

 

[Dave Maxwell]

2ot direct bury aluminum. Im going in conduit for my own comfort. Will be across my back yard.

 

[pattenp]

I don't know what size 2ot is. Wire types are thhn, thwn, rhw-2, etc.

 

[Dave Maxwell]

The electric supply company just told me they had 2/0 aluminum 3 wire conductor. For 100 amp 250 foot. That's all I know.

 

[pattenp]

If you're feeding a sub-panel in an outbuilding from a main panel you need to use 4 conductors.

 

[Dave Maxwell]

That's what the #4 copper is for. I don't have many places and this is what they had. They tried to find a four conductor

 

[pattenp]

It's most likely type USE. The 3 #2/0 & 1 #4 will fit in 2" conduit.

 

[pattenp]

Why not run an aluminum equipment ground?

 

[Dave Maxwell]

No clue.

 

[pattenp]

You can use aluminum for the ground. #1 Al is typically used as the ground in 2/0 Al cable.
The #1 Al should be cheaper than #4 Cu.

 

[Dave Maxwell]

Thank you.

 

[wyliesdiesels]

I don't know what size 2ot is. Wire types are thhn, thwn, rhw-2, etc.

I think he means 2/0! And I think its actually spelled ought!

 

[Ironhorse]

you can not run 2/0 UF cable in pipe of any kind...it is a ***** for one and in pvc it builds static. On my HV runs I concrete as per spec all the pipe runs for voltage bleeds

 

[pattenp]

I think he means 2/0! And I think its actually spelled ought!

Oh... I got it. Yep... ought or naught.

 

[pattenp]

you can not run 2/0 UF cable in pipe of any kind...it is a ***** for one and in pvc it builds static. On my HV runs I concrete as per spec all the pipe runs for voltage bleeds

Who said UF? I've never seen UF cable in 2/0. Is it actually made that large?

 

[Dave Maxwell]

That's how they wrote it.2/0. Verbally said ought. OK. Next question. How so you put slight bends in it. So they sell 45 angles in schedule 40?

 

[pattenp]

Slight bends can be made using a heat gun. Elbows come in radius down to 11.25 deg.

 

[Dave Maxwell]

Great to hear. Wasn't sure how many bend options I had. Stupid phone and big hands. Do became so in previous message

 

[Dave Maxwell]

 

[Dave Maxwell]

2.55 / ft. Got it for 1.57/ft. Through work

 

[pattenp]

Look and see what the insulation ratings are that's stamped on the wire. See if it's just USE-2.

Or does it also have RHW-2 or XHHW-2 stamped on it?

 

[Dave Maxwell]

Will look. Direct bury if that means anything

 

[pattenp]

Will look. Direct bury if that means anything

Nope. I'm asking about the insulation rating because you may have wire that can't be run inside. You have to terminate it on the outside in a junction box if it's just USE-2. If it carries the RHH or RHW-2 or XHHW-2 stamp then it's okay to run it inside because it is fire resistant insulation.

 

[Dave Maxwell]

It better be OK. Told them what is was for

 

[pattenp]

Not all direct bury cable are created equal. Some can also be run inside and some cannot. The ones that can be used inside have an insulation that is fire resistant. In addition to being USE-2 the fire resistant direct bury cable also carry a rating of RHH or RHW-2 or XHHW-2.

Had you planned to run this cable to the inside of the structure?

 

[Dave Maxwell]

Yes from my home breaker panel to one in the garage

 

[pattenp]

I'll cross my fingers for you and hope it's fire resistant rated. And you are putting it in conduit the whole distance.. right? I can't say I'd lose sleep over using it inside if it's not fire rated, but it would not be to code.

So post back the good or bad news.

 

[wyliesdiesels]

It better be OK. Told them what it was for

The problem is that there is so many different insulation types and grades and not all electricians and people in the trade know about all the different types! So they may have given u something that would work for part of your scenario but not the rest!

 

[Dave Maxwell]

Use sun res. News to get my meter out and lable both ends of each wire.

 

[Dave Maxwell]

OK so when coming out of my house garage. I'm going down with schedule 80 and through the wall. Os it OK to be at ground level just outside the house. Maybe 6 inches before I'm done to the 20 inch mark. Will be schedule 80 anywhere that's exposed to possible damage. 40 under ground.

 

[pattenp]

Coming out the wall a little above ground level is okay.