If a 480, 3 phase branch circuit feeds a small (2 KVA) 480:120, 1 phase transformer, does GFPE protection on the branch circuit also protect the 120 VAC derived circuit? This application is for 120 VAC heat tracing.
If a 480, 3 phase branch circuit feeds a small (2 KVA) 480:120, 1 phase transformer, does GFPE protection on the branch circuit also protect the 120 VAC derived circuit? This application is for 120 VAC heat tracing.
480V GFPE is for equipment protection only (its trip point is way higher than 5mA).
The transformer creates a new system, therefore any ground fault on the 120V secondary is not reflected to the 480V primary.
