Originally Posted By: roconnor
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Bob … Joe and I tend to also agree that a 60A panel is not a flag by itself, especially if there are gas appliances in the house.
For those that don't know where Bob and I are going with this, let me give ya an example:
A 60A 3-wire 120V/240V service would have a capacity of about 14,400 VA [60A x 240V]. With the requirements for existing homes, that would need to handle 100% of the first 8,000 VA and 40% of anything over that (NEC 220.31).
If ya look at say a 1,500 sf home, the basic lighting/receptacle and appliance load would be 9,000 VA [3 VA/sf, one 1,500 VA laundry circuit, and two 1,500 VA kitchen circuits ? which includes the load from a typical refrigerator], which leaves about 6,000 VA of feeder capacity.
But even if ya don?t have gas appliances, it's not an automatic flag. If ya add a small range at say 8,000 VA and a dishwasher at say 1,500 VA it still leaves about 2,200 VA in feeder capacity [14,400 VA - 8,000 VA - 40% x 10,500 VA] for say some nominal room AC load, oil fired heat plant motor, or maybe a box freezer ... ![icon_wink.gif](upload://ssT9V5t45yjlgXqiFRXL04eXtqw.gif)
But after that you are really at capacity for the service with no room for any other modern appliances or expansion. And forget about central AC for that house (the 40% demand factor is not applied to major heating/cooling loads). So, that situation would be something to point out ... even though it may not be overloaded ... ![icon_wink.gif](upload://ssT9V5t45yjlgXqiFRXL04eXtqw.gif)
Robert O'Connor, PE
Eagle Engineering ?
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I am absolutely amazed sometimes by how much thought goes into doing things wrong