can one get 300 amps through a panel with a 200 amp breaker?

hfcarson · Jul 3, 2012, 07:29 AM

Stan....just for fun:
5,000 sq ft @ 3va/sqft
with (6) small appliance circuits x 1500va each
approx 12.5 tons of HVAC = approx 12,500va
8 kva electric range
5 kva electric dryer
Calc this out with allowed diversity and we get 142.7 amps @ 240V, 1P

It is possible that a 200 ampere, 240V service will work for this size dwelling.....

tkrussell · Jul 3, 2012, 10:24 AM

I am not getting into if the 200 amp service is sized properly.

I want to address the original concern of Doug stated here:

Quote:

Originally Posted by DouglasMcCarty

An electrician claims he upgraded our electrical panel and added another 100 amps to the existing 200 amp service panel.

Doug, not sure what you think or know you have been sold, but clearly, you had and still only have a 200 amp service.

I am not sure how the electrician "upgraded" the existing panel, but the 200 Amp Main clearly serves the new 100 amp sub-panel.

All that was done was more load, or at least more circuits, added to the existing 200 amp Main.

Does this answer your original question?

tommybwiz · Jul 5, 2012, 06:16 PM

Definately not a 300 amp set-up. Apparently all that was done (by the pics) was a 100 amp breaker added to the main panel to supply the sub-panel. If it had been a 300 amp upgrade, the meter base would have been changed out to a 325 amp, dual tap, larger service entrance cables, etc., or a 325 amp base with a dual tap disconnect. Was any of that done? You don't have pics for that, and it wasn't mentioned.You can't make 300 amps out of a 200 amp box. Just don't work. Sounds like you got duped.

ma0641 · Jul 5, 2012, 08:42 PM

Based on your picture it is a 200 amp service, that's what the main breaker says. It also shows a subpanel but the limitation is the main breaker.

can one get 300 amps through a panel with a 200 amp breaker?

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