TRANSFORMER INSTALL 112.5 KVA 480 to 208Y/120

[Part-Time]

would this work for the installation from what i can tell some of the conduit is over sized but i think that was intentional
The supply wires will be about 400 feet long

 

[infinity]

Any of your conductors sized at 90? C are not code compliant since almost all terminations are only rated for 75? C.

 

[david luchini]

Assuming the 480V supply is from a 200A OCPD, the feeder sizes appear compliant (assuming the tap lengths are OK.)

The transformer secondary conductors should be 4 conductors, not 3, and the #6 green should be #4 per 250.30(2) and 250.66.

 

[infinity]

Also the #6 EGC in the transformer primary feeder needs to be increased in size since the ungrounded conductors have been increased from a 150 amp-#1/0 to a 175 amp-#2/0.

 

[Part-Time]

Assuming the 480V supply is from a 200A OCPD, the feeder sizes appear compliant (assuming the tap lengths are OK.)

The transformer secondary conductors should be 4 conductors, not 3, and the #6 green should be #4 per 250.30(2) and 250.66.

I made some changes Thanks for all the input so far

 

[augie47]

Do the panels have mains ?
You might want to address the transformer GEC. (250.30)

 

[Part-Time]

Yes Both panels will have A main Breaker
What about grounding it to the building steel frame?

 

[Part-Time]

Updated

 

[Part-Time]

Updated

Updated

View attachment 6727

 

[augie47]

somewhat a mute point since the wire sizes are correct, but I would show the 75? rating rather than the 90? since that is what you are using and, yes, I would add the GEC to the electrode (and perhaps the bond jumper) rather than have one say "we wired it just like you showed"

 

[Part-Time]

Udated

Udated

Maybe This is the best

 

[DARUSA]

Updated

on the 480 volt 100 amp Panel with #3 conductor the ground wire need to be #4 or at less #6 because it is a tap feeder and the OC protection is 200amp. But I'm sure is number #4!!!

 

[Part-Time]

I will look at that might just change it to #4 anyway

 

[GearMan]

Did you oversize the XFMR for a reason? Normally a 75KVA would be sufficient to feed a 200A panel.

 

[John120/240]

Did you oversize the XFMR for a reason? Normally a 75KVA would be sufficient to feed a 200A panel.

Yes it is required to size XFMR oversize for future use. Just ask T M Shaib for his

explanation.:roll:

 

[cdslotz]

Yes it is required to size XFMR oversize for future use. Just ask T M Shaib for his

explanation.:roll:

Do they plan on mounting the future panel or OCPD right next to the new 200A 120/208 panel?
Will there be room?

 

[Part-Time]

Yes
The transformer is Over Sized for future use if needed