1200A Service from transformer to main switch

[Sqjlighting]

If I’m running 400ft underground from transformer to 1200A 208/120V 3 Ph 4 W main switchgear, please confirm 4-3” pvc Conduits with 1-500 kcmil and 1-#3/0 ground wire in each? Las Vegas location.

 

[infinity]

380*4=1520 so the wire size is good. That should be 4-500's per raceway. Is this ahead of the service disconnect? If so then there should not be an EGC in any of the raceways.

Welcome to the Forum.

 

[electrofelon]

As Rob said, we need confirmation on customer or utility transformer. If this is a service there would be no EGC. If this is an SDS and it is outside and PVC then I would think you would use the exception where you can Bond both ends, so no ssbj needed

 

[augie47]

You can play with the numbers but most likely you could drop a wire size without an excessive voltage drop.
(For example a set of 400 kcmil would only give you 3% VD at 1100 amps)

 

[hillbilly1]

380*4=1520 so the wire size is good. That should be 4-500's per raceway. Is this ahead of the service disconnect? If so then there should not be an EGC in any of the raceways.

Welcome to the Forum.

Except for in Arkansas, for some reason (probably uneducated inspector) they want a EGC from the transformer to the service disconnect! LOL!

 

[Sqjlighting]

Yes, this is before the service disconnect between utility transformer and switchgear. Thank you very much for your replies!

 

[ron]

If I’m running 400ft underground from transformer to 1200A 208/120V 3 Ph 4 W main switchgear, please confirm 4-3” pvc Conduits with 1-500 kcmil and 1-#3/0 ground wire in each? Las Vegas location.

Even without derating from Annex B, 3 sets of 500s are not enough for 1200A.

 

[infinity]

Even without derating from Annex B, 3 sets of 500s are not enough for 1200A.

Read it again, it's 4 sets in 3".

 

[Tulsa Electrician]

If I’m running 400ft underground from transformer to 1200A 208/120V 3 Ph 4 W main switchgear, please confirm 4-3” pvc Conduits with 1-500 kcmil and 1-#3/0 ground wire in each? Las Vegas location.

I see you do not mention CU or Al , Thwn or Xhhw etc.
Is you PVC sch 40 all the way. No sch 80 anywhere.
Also if you add the EGC ( 3/0 cu) for some reason, check your raceway fill.

400 foot run in 3" kinda tight depending on raceway routing and bends.

4-500 & 1-3/0 in. 3" sch 40 PVC per NEC is over 40% fill.

 

[Tulsa Electrician]

I would like to add if a compact Xhhw for the 500 and a Thwn 3/0 is used it is under 40% fill and code compliant for sch 40 PVC.