renosteinke
Senior Member
- Location
- NE Arkansas
Sorry, kwired, you misunderstand the code requirement for the transfer switch.
Remember, the switch is expected to perform under a 'full load.' The house service size is defined as the amp rating of your main disconnect. The genny size is defined by the nameplate. The switch has to be able to switch both.
Thus, a house with a 200 amp service and a 125 amp genny will need a 200 amp transfer switch- even if the house calculates at 125 amps and you never measure more than 90 amps with everything running.
Remember, the switch is expected to perform under a 'full load.' The house service size is defined as the amp rating of your main disconnect. The genny size is defined by the nameplate. The switch has to be able to switch both.
Thus, a house with a 200 amp service and a 125 amp genny will need a 200 amp transfer switch- even if the house calculates at 125 amps and you never measure more than 90 amps with everything running.