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DSEIBEL1 · 02-08-2010, 09:31 PM

Hello,

I am trying to size a sub panel for my basement. Below are the loads. I believe I take the total wattage and divide by 240VAC based on the fact it will be a 240V panel. I come up with 31 Amps. I have a few questions..

-Is my circuit distribution correct, are the loads/items per circuit within limits?

-What size of sub panel would you recomend?

-How can I tell that my main panel can handle this sub-panel?

Proposed sub-panel loads.

15A - 100W - Smoke Detector
15A - 1000W - Bathroom heater
15AGFI - 360W - Bathroom receptacles
15AGFI - 300W - Bathroom lights
15A - 1800W - 10 x receptacles
15A - 1800W - 10 x receptacles
15A - 720W - 4 x receptacles
15A - 450W - 9 x 50W potlights (600W dimmer)
15A - 420W - 7 x 60W Wall lights (600W dimmer)
15A - 400W - 4 x 100W lights (no dimmer)

7350 Watts total.

Note: My bathroom circuits are on GFI breakers (lights and receptacles seperate...I get a deal on breaker...I know not neccessary).
Also...accounted for 180W per receptacle.

Magnettica · 02-09-2010, 01:01 AM

-Is my circuit distribution correct, are the loads/items per circuit within limits?

Your load calcs look great. Normally it is done by the square footage of the area but what you did is fine too. Except for the bathroom receptacles that should be calculated at 1500 watts, not 360. Hair dryer 360 watts? Ok? :D

-What size of sub panel would you recomend?

60 amp 120/ 240.

-How can I tell that my main panel can handle this sub-panel?

By doing a load calc according to article 220.

Magnettica · 02-09-2010, 01:03 AM

Also, your bathroom receptacles need to be 20 amps, not 15.

**Scuba_Dave** · 02-09-2010, 08:51 AM

Where are you located ?