Early Parallel feed

[Genesis006]

What is the best way to wire a 600amp 3 phase service. What size conduit and wire?

 

[roger]

Why not tell us what you think and then we can offer some opinions.

Roger

 

[highlegdelta]

Around here, the utility has strict requirements on conduit sizes for different size services. I'd start by contacting your utility.

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[kwired]

What is the best way to wire a 600amp 3 phase service. What size conduit and wire?

Pretty vague question that has many possible answers. More details will narrow down some of those possible answers.

 

[Genesis006]

Best what to feed 600 amp service

Best what to feed 600 amp service

I am install a 600 amp 3 phase service. I believe I need two 3-1/2" PVC schedule 40 conduits with 300 mcm paralel feeders from the transformor to the 600 amp distrubution panel with # 1 ground. The reason for the question is, they are requiring two 4" conduits for future to PP-3 and PP-4. When I need 3-1/2 why wound they want 4"?

 

[roger]

Who is doing this design, the Power Company or a design engineer? If they are giving you the conduit sizes aren't they also giving you wire sizes?
If this is a service you won't need the EGC

In many designs conduits are oversized and if you included it in your proposal you should just put them in and get paid.

Roger

 

[kwired]

I am install a 600 amp 3 phase service. I believe I need two 3-1/2" PVC schedule 40 conduits with 300 mcm paralel feeders from the transformor to the 600 amp distrubution panel with # 1 ground. The reason for the question is, they are requiring two 4" conduits for future to PP-3 and PP-4. When I need 3-1/2 why wound they want 4"?

You may comply with NEC with 3.5" but that doesn't mean a POCO or even local codes can't still require 4". Ask them for the reference to their requirement if it is beyond NEC. If they have a standard that applies to everyone then follow it. If they are shooting from the hip - good luck with other dealings with them.

 

[Carultch]

I am install a 600 amp 3 phase service. I believe I need two 3-1/2" PVC schedule 40 conduits with 300 mcm paralel feeders from the transformor to the 600 amp distrubution panel with # 1 ground. The reason for the question is, they are requiring two 4" conduits for future to PP-3 and PP-4. When I need 3-1/2 why wound they want 4"?

Integer inch sizes of conduit are a lot more common, and a lot easier to get. Occasionally you may find fitting product families that mysteriously omit certain half inch sizes.

Here's an example of an expansion coupling that omits the 3 1/2" size, for reasons I don't understand.
https://www.rexelusa.com/medias/sys...&realname=Bizline-RH_Bizline-RXP_24_CT_FS.PDF

 

[kwired]

Integer inch sizes of conduit are a lot more common, and a lot easier to get. Occasionally you may find fitting product families that mysteriously omit certain half inch sizes.

Over 2 inch maybe, 1/2, 3/4, 1-1/4, 1-1/2 are pretty common both pipe and fittings in about all types of conduit.
Even 2-1/2 is pretty common.