4000 Amp Service

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jap

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(8) 4" existing underground pvc conduits (from vault outside where Utility X-fmr will be located) to building.

4000 amp MCB in Main Switchboard inside building. 120/208v 3ph 4w.

How many options are there of getting a service of that size through the existing conduits, other than 750 MCM copper conductors and 90d C lugs at both ends?

JAP>
 
You could use two sets of 300 kcmil copper in each raceway.

320 amps * 80% * 2 sets = 512 amps/Conduit * 8 = 4096 amps.
 
XHHW?

XHHW?

Compact conductor XHHW? Is it even still available? I recall an EC asking to use it some years ago when an addendum change in conduit sizing was missed.
 
jap said:
How many options are there of getting a service of that size through the existing conduits, other than 750 MCM copper conductors and 90d C lugs at both ends?
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With this choice, your challenge would be finding something on the service disconnect side that would be rated with 90deg terminations.

It is always weird but true, that even if you have 90deg terminations, you still can't use 90 deg column without the equipment the lugs being mounted in have been tested (if the equipment is required to be listed) at 90deg, which is essentially no equipment rated at 600V or less.
 
ron said:
With this choice, your challenge would be finding something on the service disconnect side that would be rated with 90deg terminations.

It is always weird but true, that even if you have 90deg terminations, you still can't use 90 deg column without the equipment the lugs being mounted in have been tested (if the equipment is required to be listed) at 90deg, which is essentially no equipment rated at 600V or less.
Click to expand...

It is tough.

This is more of "this is what we got", how do we get a 4000 amp service to the building with what we have.


JAP>
 
The Distribution Board will be new so there are options as to how the conductors will connect to it.

JAP>
 
jap said:
It is tough.

This is more of "this is what we got", how do we get a 4000 amp service to the building with what we have.


JAP>
Click to expand...

At least you can make it work and still use 75 degree C terminations.
 
infinity said:
At least you can make it work and still use 75 degree C terminations.
Click to expand...

Honestly, pulling parallel conductors in each of the conduits never even crossed my mind until you brought it up.
I cant recall ever doing that in my career, but, it seems to meet the need.

JAP>
 
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