Subpanel size

[iwire64]

I'm adding a circuit in a residential system for a 40A pool heater. Tje existing panel is full, so I need to add a subpanel. I can steal the breaker space that currently houses the 30A pool pump and move that circuit to the new subpanel. What size breaker should feed the subpanel?

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[cpinetree]

It may be easier / less expensive to just add a 30 or 40 amp sub panel and move several of the single pole loads to it.

If not I would go with 80 amps.

 

[JFletcher]

I'm adding a circuit in a residential system for a 40A pool heater. The existing panel is full, so I need to add a subpanel. I can steal the breaker space that currently houses the 30A pool pump and move that circuit to the new subpanel. What size breaker should feed the subpanel?

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What size is the subpanel and what size wire are you going to feed it with? How much capacity is left in the main panel?

 

[Smart $]

From an owners cost, ease of installation the first thing to do (aside from the load calculation) is to check tandem breaker possibility. Usually easy to move a couple low-amp line-to-neutral loads to a couple tandems and make room for a 2-pole. Of course, while you are at it, you should check what rating of breaker the panel will accept if you have to go the subpanel route.