sands35
Well-known member
I'm doing some long term planning for a re-wire project.
The house was build in '62 and has a mish-mash of wire projects in it.
The original wire has no grounds and is that nasty tar paper fabric stuff.
I know of a couple outlets and lights that have mixed hot/neutral wires and a couple other issues.
The bathrooms are grounded and has GFCIs. There is nothing that needs to be fixed right now. Eventually, I'll do the 1st floor as well.
The basic plan is to run a sub panel to a craft room on the 2nd floor, then wires up into the attic, then down into the rooms as appropriate. Most of the job is pretty basic, if a PITA. A couple outlets are on exterior wall that will be interesting. Once I get the sub panel in, I'd just go slow and do it room by room. (I need to get more insulation in the attic too, but want to do the electrical 1st).
4 bedrooms, 2 baths, 1 hall and one craft room and 5 closets with one light each.
Question:
What amp rating on the sub panel to service that?
My 1st look suggested 40 amp feeder would be OK. 8-3 NM or 6-3?
About 1200 sq ft on the 2nd floor. (basic load calcs based on sq ft is under 30 amps)
The basement is conditioned space - location of the main panel I'll pull from.
The run is about 75 feet. The math suggests a ~3% drop at 30 amp draw for #8.
The bathrooms will have their own 20 amp and I'll probably use 1 breaker for 2 bedroom's outlets and 1 breaker for 2 bedroom's lights.
I'll need to put in conduit to get to the 2nd floor (can go through a coat closet below on 1st floor). I'd rather avoid putting up conduit in in the unfinished basement if I can.
There is nothing special about the rooms. Ceiling fans, clock radios, a sewing machine, iron, etc. Standard normal house usage. About the heaviest use would be 2 blow-dryers going at once with lights and bath fans.
The house was build in '62 and has a mish-mash of wire projects in it.
The original wire has no grounds and is that nasty tar paper fabric stuff.
I know of a couple outlets and lights that have mixed hot/neutral wires and a couple other issues.
The bathrooms are grounded and has GFCIs. There is nothing that needs to be fixed right now. Eventually, I'll do the 1st floor as well.
The basic plan is to run a sub panel to a craft room on the 2nd floor, then wires up into the attic, then down into the rooms as appropriate. Most of the job is pretty basic, if a PITA. A couple outlets are on exterior wall that will be interesting. Once I get the sub panel in, I'd just go slow and do it room by room. (I need to get more insulation in the attic too, but want to do the electrical 1st).
4 bedrooms, 2 baths, 1 hall and one craft room and 5 closets with one light each.
Question:
What amp rating on the sub panel to service that?
My 1st look suggested 40 amp feeder would be OK. 8-3 NM or 6-3?
About 1200 sq ft on the 2nd floor. (basic load calcs based on sq ft is under 30 amps)
The basement is conditioned space - location of the main panel I'll pull from.
The run is about 75 feet. The math suggests a ~3% drop at 30 amp draw for #8.
The bathrooms will have their own 20 amp and I'll probably use 1 breaker for 2 bedroom's outlets and 1 breaker for 2 bedroom's lights.
I'll need to put in conduit to get to the 2nd floor (can go through a coat closet below on 1st floor). I'd rather avoid putting up conduit in in the unfinished basement if I can.
There is nothing special about the rooms. Ceiling fans, clock radios, a sewing machine, iron, etc. Standard normal house usage. About the heaviest use would be 2 blow-dryers going at once with lights and bath fans.
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