Need help

[neb]

How do you figure the secondary fusing for a 3 phase pad mount transformer?

Example>> 500kva/480 volt/dual voltage 7.2/14.4 What is the formula or a quick way to figure it out.

Thanks

[Electriceel]

We don't fuse anything on the secondary side. The formula for secondary full load amps is. (KVA) times (1000) divided by (secondary phase to phase voltage) divided by (square root of 3). For this transformer it would be 600 amps.

[neb]

This would be what the transformer itself would be fused at. Like in bayonet fuse for the secondary fuse size. In the transformer not after it get to the disconnect
Thanks

[Pootnaigle]

Ummget an uglis book and just look up the fullloadcurrent at both the secondary and primary sides