Quote:
Originally Posted by Zeke
If you have to increase the main service to accommodate more breakers, I would first consider the sub panel. However, the main has to still have enough capacity for the loads. You can't keep adding 240v circuits forever.
The way I understand this is that you are just replacing the condenser unit, so the load isn't that much more. If it boils down to spaces for breakers only, by all means put a sub in. The nice thing about a sub in the same building is that you don't need new ground rods. Just unhook (or don't complete) the bond between the ground bus and the neutral bus.
Calculate the total load on the sub when choosing the breaker to feed it. Most say that the running amps is just enough, so you don't need 70 amps to feed a 40 and a 30 breaker. Hopefully your new condenser has a soft start anyway. But, given what size breakers are available for your main might be the deciding factor. In that case choose the larger. You may want to add another circuit some day. Like a car charger.
|
For Clarification:
My main panel is adequate and currently has 3 240v circuits; 1) Oven, 2) Dryer, 3) Condenser.
I just thought it would be easier to install a sub-panel at the end of the 240v dryer circuit, and then branch off to the new condenser. (rather than replace the current condenser line and climb thru my attic, run wire down the wall to the main box). But, I don't think the current breaker for the dryer is large enough for both dryer and condenser. I was thinking that would need to be the combination of both units but then they would each have their own breaker at the sub-panel.
Lastly, it is a condenser or a compressor? I've always thought it was a compressor.