Subpanel capacity
Home Improvement Asked on December 6, 2020
I will be installing a 125A subpanel using a #2 Cu THHN via 2" x 3"(L) conduit secured with four 2-in conduit locknuts (inside and outside of panels). The sub-panel shut-off will be a Q2125 125-Amp Double Pole Type QP.
The first photo shows the current configuration with a small, 8 circuit subpanel that will be replaced with a 20/20 125A box. I will further be adding 40A 240V (oven/micro combo), and 50A 240V (induction cooktop), as well as two 20A circuits, one for a dishwasher and another perhaps for an island outlet with beverage fridge (no sink or stove on the island).
I am trying to calculate the maximum capacity I can put on this subpanel, and whether I can just add the new circuits I mentioned above, or whether I need to rebalance with the main panel.
One Answer
The trick is adding up the loads not the breakers you might have close to 200 double pole amps on a 125 amp panel and it could be ok but the size of the loads and the diversity of loads like heating / cooling all come into play but if you are putting in a new panel go big they don’t cost that much more.
Answered by Ed Beal on December 6, 2020
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