Transformer Question

[KillSwitch]

hello,

Just want to run my configuration by others to see if im missing something as im new to the transformer game.

I am running 480V feeders sized for 125A into a fused disconnect w/100A Fuses.

From there I am running into a 75KVA transformer then into a 200A 120/208v Main breaker panel.

Im just wondering if this looks good , I wasnt sure if i could run secondaries straight onto the main breaker

 

[augie47]

Welcome !

You didn't mention wire sizes so we are unable to go there.
In general, what you show is workable.
If a larger disconnect is not cost prohibitive I think I might go with 125 amp fuses to reduce chances of nuisance fuse blowing.
{If your 480v feeder is protected at 125 amps at the supply , you might even need the disconnect (see 450.14)}
And a great number of transformer secondary conductors go directly to the panel main.
Don't forget with transformer secondary conductors you can;t use 240.4(B)

 

[KillSwitch]

The feeders are protected by a meter disconnect 350’ away

We are sizing conductors to 150A minimum


Sent from my iPhone using Tapatalk

 

[petersonra]

The feeders are protected by a meter disconnect 350’ away

We are sizing conductors to 150A minimum


Sent from my iPhone using Tapatalk

if you have 150 A rated conductors why are you using 100 A fuses?