skeetb1100
New member
- Location
- newark valley,ny,tioga
I am in the midst of installing a Generac 11Kw. Already installed a new service panel (200A - Generac with integrated EZ Transfer operator switch).
This switch separates the top 10 breaker slots from the bottom 20 some slots. The top portion is UTILITY only, The bottom ones are fed by the generator and utility.
This 'switch' senses when utility power is lost and allows power to flow from the generator to the bottom portion of the panel.
As I said the generator is a 11Kw with a 50A disconnect breaker on it.
The panel however has a 125A switch, which is where the supply wires from the generator 50A breaker, connect to the main service panel.
This switch in the panel is part of the Generac EZ Transfer Operator and I'm told it's not really a circuit breaker(although it sure looks like one), but is really just a switch
to allow supply from the Generator to energize the bottom portion of my new service panel.
This is NOT a separately derived system. It's only for backup in case I lose utility power.
My question involves what size feeders do I use from the generator (ie. the 50A breaker on the generator) to the connection point in the panel (the 125A switch)?
I'm told that I have to size the feeders to the larger of the two, which means I'm looking at probably #2 Cu.
However, since the generator has a 50A circuit breaker on it (and it's listed in the Generac doc as max output of about 45A), I don't understand why I can't size
these feeder wires to the 50A breaker, INSTEAD of this 125A (switch, which looks like ,but is not a circuit breaker) in the Generac EZ Transfer operator?
I don't want to run #2 Cu if I don't have to. It's not the expense, it's the 'ease of use' factor. If I could instead run 6, I'd prefer that.
It's about a 15ft run from the generator to the panel.
I plan on running the control wires for the generator in separate conduit. The power wires from the generator will be in a separate conduit.
The thing is I can't find anything on this in the NEC. Generac says wire it to the NEC.
I want to do this right, and I DO NOT want to give the inspector anything to beat me up on.
Thx in advance
This switch separates the top 10 breaker slots from the bottom 20 some slots. The top portion is UTILITY only, The bottom ones are fed by the generator and utility.
This 'switch' senses when utility power is lost and allows power to flow from the generator to the bottom portion of the panel.
As I said the generator is a 11Kw with a 50A disconnect breaker on it.
The panel however has a 125A switch, which is where the supply wires from the generator 50A breaker, connect to the main service panel.
This switch in the panel is part of the Generac EZ Transfer Operator and I'm told it's not really a circuit breaker(although it sure looks like one), but is really just a switch
to allow supply from the Generator to energize the bottom portion of my new service panel.
This is NOT a separately derived system. It's only for backup in case I lose utility power.
My question involves what size feeders do I use from the generator (ie. the 50A breaker on the generator) to the connection point in the panel (the 125A switch)?
I'm told that I have to size the feeders to the larger of the two, which means I'm looking at probably #2 Cu.
However, since the generator has a 50A circuit breaker on it (and it's listed in the Generac doc as max output of about 45A), I don't understand why I can't size
these feeder wires to the 50A breaker, INSTEAD of this 125A (switch, which looks like ,but is not a circuit breaker) in the Generac EZ Transfer operator?
I don't want to run #2 Cu if I don't have to. It's not the expense, it's the 'ease of use' factor. If I could instead run 6, I'd prefer that.
It's about a 15ft run from the generator to the panel.
I plan on running the control wires for the generator in separate conduit. The power wires from the generator will be in a separate conduit.
The thing is I can't find anything on this in the NEC. Generac says wire it to the NEC.
I want to do this right, and I DO NOT want to give the inspector anything to beat me up on.
Thx in advance
