Reseman

Can anyone tell me the best way/formula to use when doing a load calc. on a old house(40+). The customer wants to add a refrigerated air unit to their home. The house is 2000 Sq. Ft with only the Dryer being on a electric circuit. The Water Heater and Stove are gas. The Main Panel is rated at 100 Amps and was installed when they extended the Sq. Footage of their home.
Basically, I want to know what is the biggest refrigerated unit I can install without providing them with a new service upgrade?

Thanks in advance,

Reseman

480sparky

The age of the house has no bearing on a load calculation.

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randomkiller

Exactly what is your electrical trade?

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Roger123

My suggestion is to use Article 220, Branch-circuit, feeder, and service calculations. Also, see 220.16(A)(2). Basically, treat the house as being new.

Reseman

So what do you guys do....Do you count all the existing fixtures, outlets, appliances, etc. or do you guys just calculate it as a new house?

JohnJ0906

You can do a standard 220 calculation, or use 220.83

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