Existing dwelling load calculation

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Dsg319

Dsg319

Senior Member
Location
West Virginia
Occupation
Wv Master “lectrician”
Need to pull a load calculation on existing dwelling unit that wants to finish a basement as livable. Just general purpose lights receps and bathroom circuit. Will be using 220.83.

Not adding any heating or air equipment as it is already plumbed into the basement.

It’s a two story house so it has 2-air handlers and 2-outdoor heat pumps.I know it’s a silly question but what exact nameplate data do I need take off of them to add into my calculations. I know I obviously need to get current so I can turn it into VA for the calcs, Do I just take the current given off of the compressor motor and O.D. Motor?

I remember a formula using tons of the unit to find VA but I can find that info on the unit.
 

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I would just use the minimum cir. ampacity since that has 125% built in. Are you doing this because you have to or because you are worried about overload. I would bet money that adding the basement with lights and receptacles won't add much at all.
 
Dennis Alwon said:
I would just use the minimum cir. ampacity since that has 125% built in. Are you doing this because you have to or because you are worried about overload. I would bet money that adding the basement with lights and receptacles won't add much at all.
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Thank you and Just OCD worried about overload lol. But good learning experience to go ahead and complete the calculation anyways.
 
Dennis Alwon said:
I would just use the minimum cir. ampacity since that has 125% built in. Are you doing this because you have to or because you are worried about overload. I would bet money that adding the basement with lights and receptacles won't add much at all.
Click to expand...
I need to research some more on heat pumps as I don’t have any experience with them, but if I use the min circuit ampacity, I assume that would be close to the same for the pump when heating vs cooling.
 
Dsg319 said:
I need to research some more on heat pumps as I don’t have any experience with them, but if I use the min circuit ampacity, I assume that would be close to the same for the pump when heating vs cooling.
Click to expand...
You need to also know if the compressor can run while the heat strips are on.
 
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