I need some expert advice on my residential application involving a 200a service from the utility and a 22kW Generac standby generator.
The house originally had a 100a service for many years, but I anticipated building a workshop so I requested an upgrade to 200a service and it was installed back around 2015 in my absence and was very straightforward, using an underground feeder and a 200a Square D meter main, with a 100a branch breaker feeding an existing ancient interior MLO Square D panel.
Around 2023, the Generac gear was installed and consisted of the 22kW genset and 200a, service disconnect rated ATS.
Referring to my crude SLD sketch, I am questioning the need for the Siemens distribution panel, as I believe the ATS, according to code and generally accepted industry practice provides adequate protection for the interior MLO panel, which is less than 3’ from the ATS.
Also, I do not like the wiring practices used by the electrical contractor when he installed the Siemens panel. He came off the 100a breaker with #2 copper, then in the meter main panel he did inline splices and increased the conductor size to 2/0 copper to go into the MLO panel. Why?
I would like to eliminate all this clap trap, remove the Siemens panel, and come off the “Load” lugs of the ATS with #2 copper and go straight into the MLO panel. FWIW the peak load of my house has never exceeded 13kW and before the 200a utility upgrade, it was being fed by a 100a service.
Would this be acceptable? Thanks in advance!
The house originally had a 100a service for many years, but I anticipated building a workshop so I requested an upgrade to 200a service and it was installed back around 2015 in my absence and was very straightforward, using an underground feeder and a 200a Square D meter main, with a 100a branch breaker feeding an existing ancient interior MLO Square D panel.
Around 2023, the Generac gear was installed and consisted of the 22kW genset and 200a, service disconnect rated ATS.
Referring to my crude SLD sketch, I am questioning the need for the Siemens distribution panel, as I believe the ATS, according to code and generally accepted industry practice provides adequate protection for the interior MLO panel, which is less than 3’ from the ATS.
Also, I do not like the wiring practices used by the electrical contractor when he installed the Siemens panel. He came off the 100a breaker with #2 copper, then in the meter main panel he did inline splices and increased the conductor size to 2/0 copper to go into the MLO panel. Why?
I would like to eliminate all this clap trap, remove the Siemens panel, and come off the “Load” lugs of the ATS with #2 copper and go straight into the MLO panel. FWIW the peak load of my house has never exceeded 13kW and before the 200a utility upgrade, it was being fed by a 100a service.
Would this be acceptable? Thanks in advance!
