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We recently put an addition on our home. I am looking to run a subpanel from our 200 amp service panel out in the yard at the meter (mounted to a pole), 75' to subpanel location.

In the addition we have 2 bedrooms, walk in closet, laundry room and bathroom. We also added on to our living room 10x15. All these rooms will have receptacles, lights and a 240 volt hook up for the dryer in the laundry room and baseboard electric heaters. (1 per room except laundry and living room) Total of 4 heaters. I currently picked up a 125 amp homeline 20 space 40 circuit panel box without main breaker. Is a 100 amp breaker from main panel more than enough? Can I use a 60 amp breaker to feed the subpanel? This is going to be inspected per NEC code.

  • You might want to return the panel you purchased, and get one with a main breaker installed. If you're in a jurisdiction covered by NEC, you'll likely need a disconnect at the house (which a main breaker qualifies). It's often cheaper to buy the panel with a breaker, than to buy a panel and breaker separate. – Tester101 Jan 8 '15 at 13:10
  • Please include the total square footage of the addition, as it's useful for calculating lighting loads. A sketch of the addition (with dimensions) would also be helpful, for calculating the number of receptacles that are required. – Tester101 Jan 8 '15 at 13:13
  • Whether or not this work will be inspected; and to which codes, completely depends on your location. Including that information will help folks answer that part of the question. – Tester101 Jan 8 '15 at 13:14
  • Thanks for the quick reply. I do actually have a main breaker panel box. I looked at it wrong. (Helps to take it out of the box and look directly at it) I am just going to run 100 amp breaker to the sub panel to play it safe. I dont want plagued with tripping a 60 amp in the middle of the night with zero degree temps. I am not sure how to upload diagrams to the comment section but that is my next question, how many feet between receptacles per IRC 2009 Electric code. From what I gather it shows no more than 6ft. I will upload an image as soon as I get it figured out! – Duane Jan 9 '15 at 17:01
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Each baseboard heater is probably 15A (if not then check what they actually are), and the dryer is 30A. So you're already at 90A. The washer (is it frontloading?) will need 15A/2 (it's 120V), and so will the bathroom, so that's 105A. I can easily imagine all those running at once. Then you have some plugs and whatnot, but you probably won't max all of them at once.

Looks like 120A will be OK, but just barely. Is electrical heat really your only option? Can you use a gas dryer?

  • Thank you for your reply also. I will have to check the baseboard heaters to know exactly what they are. As of right now that is the heating source we are going with. I dont like it but in the future we want to go with a self unit, heat/ac pump. A gas dryer is not an option without running gas line in from the street. A bit more expense I'd rather avoid if possible. As i mentioned to @testor101 I am just going to run a 100 amp from the main into my subpanel that has a main disconnect. Looking to upload a few images of my next step. Required distance between receptacles per IRC 2009 code. – Duane Jan 9 '15 at 17:08
  • @Ariel, your numbers are not correct since some of the items are 240V and some are 120V. You DO NOT just add up the numbers to get a load. That's simply not how it works. – Speedy Petey Jan 9 '15 at 18:13
  • @SpeedyPetey Did you not actually read what I wrote? I am well aware of that. I'll quote myself "15A/2 (it's 120v)". I assumed the baseboard heaters were 240V, if not he can plug in the real numbers, no one else answered so I gave him at least a start. And I only added the numbers for the items that likely will all be on at once at least sometimes. – Ariel Jan 9 '15 at 19:15
  • Again, adding up the numbers on the breakers, especially general use circuits, is a meaningless number. – Speedy Petey Jan 9 '15 at 20:01
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    @ariel, AGAIN, adding up the numbers on the breakers, regardless of their intended use, is a meaningless number. – Speedy Petey Jan 9 '15 at 21:05

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