Concept site Twelve Gauge Electric is a fictional electrician, designed and built by Patrick Bushe to show what I make for electricians. Fictional, by Patrick Bushe

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Will your panel handle it?

Tell us the panel, the house and what you want to add. You’ll see a rough load, whether there’s room, and a sample price for the work.

Rough math first. The real load calculation happens at the panel.

1. Main breaker size
1,600 sq ft
3. Already in the house electric, not gas
4. What you want to add
5. New 20 A circuits Kitchen counters, a bathroom, a garage workshop. 0
A wall charger on the outside wall of a house, plugged into a car parked beside it

How the math works.

  1. Everything in the house adds up. Lights at 3 volt-amps a square foot, the kitchen and laundry circuits, and each big appliance at the number on its label.
  2. Not everything runs at once. The first 8,000 volt-amps count in full, the rest at 40%. Air conditioning and heat pumps count in full.
  3. We keep 20% back. A panel that runs past 80% for hours gets warm. Under the line, you have room.
  4. Then we look for real. Open slots, the age of the panel, the wire to the meter and what your utility allows can all change the answer.