I have a question for any line-workers (U.S.A.).
I'm installing 800A Delta 120/208/240 3PH services and was wondering about the size of the transformer fuses. I use gear with an 800A breaker. In another thread is a discussion about fuses and breakers.
My curiosity is this...if there were a short in this service and it flashed, the fuse at the transformer might be more reliable in disconnecting than the main breaker, so why have a main breaker? There will be six or less disconnects in this service (usually 4 or 5).
There are two pole-mounted transformers for each of these 800A services.
Another question I have is...does anyone have a wiring diagram for how they get 3PH from two HV wires. I've seen winding diagrams for Delta secondaries, but not for the primary with the secondary.
Any help or comments would be greatly appreciated.
Dave
