cornell
New member
- Location
- atlanta, ga
Hi all. I'm a builder/contractor excited to be wiring my own home, and I'm taking this opportunity to understand the how/why of things as opposed to letting the subs do that for me. I hope you all don't mind sharing some knowledge with me directly.
When it comes to these combo panels, for example the GE TSMR420CSCU with the add'l 4 spaces that can feed the 2 AC units directly, do these loads (2-40a breakers, most likely) get counted in the load calcs? They have their own breakers as well as subsequent service disconnects, so I can see the logic of not needing the add'l protection of the main 200a breaker and hence bypassing it, but that would effectively make it a 280amp panel then, no? I've looked at the schematics and couldn't make out how these two sets of breakers are connected internally.
I ask because my AC units are next to the meter main and this would take approx 8-kva off my 220.51 load calc., allowing me to prewire for an electric vehicle outlet instead. My SEC to the load center is a 4/0, anticipating the 200a service draw, but if I feed my AC's directly off the meter main what does that do my my panel and wire requirements? Am I limited to whats left over??
I know my NEC knowledge on this is limited, obviously. Wanting to learn.
When it comes to these combo panels, for example the GE TSMR420CSCU with the add'l 4 spaces that can feed the 2 AC units directly, do these loads (2-40a breakers, most likely) get counted in the load calcs? They have their own breakers as well as subsequent service disconnects, so I can see the logic of not needing the add'l protection of the main 200a breaker and hence bypassing it, but that would effectively make it a 280amp panel then, no? I've looked at the schematics and couldn't make out how these two sets of breakers are connected internally.
I ask because my AC units are next to the meter main and this would take approx 8-kva off my 220.51 load calc., allowing me to prewire for an electric vehicle outlet instead. My SEC to the load center is a 4/0, anticipating the 200a service draw, but if I feed my AC's directly off the meter main what does that do my my panel and wire requirements? Am I limited to whats left over??
I know my NEC knowledge on this is limited, obviously. Wanting to learn.
