Residential Wiring

[tallgirl]

I have seen from DeWalt a propane heater that uses their power tool batteries to run a blower and ignition controls though.

Just Say No.

 

[Fred B]

I've had one for years, runs on propane. Not recommended to use in the house though.

I have seen from DeWalt a propane heater that uses their power tool batteries to run a blower and ignition controls though.

Milwaukee has one too. Could have used one a couple of years ago. Wiring a barn no power yet and near zero temps outside and wind blowing like the dickens off the lake. It came out shortly after completing project.

 

[markwilkie]

I'm sure this topic has been kicked around before. I believe there is no maximum number of receptacles you can put on a 15 amp circuit in a residential dwelling, correct? With that being said, I was curious how many receptacles you prefer to put on a 15 amp circuit when you're roughing a house, what's your rule of thumb?
Do you keep your lighting on separate circuits, or do you combine lighting and receptacles together?

I would put lighting on seperate15amp circuits. Plugs on 20s. And usually figure 180va per plug which is 1.5amps per plug. 80% of 20amps=16.16÷1.5 is over 10 receptacles. I wouldnt put more than 10-11 plugs on a 20amp circuit.

 

[Fred B]

I would put lighting on seperate15amp circuits. Plugs on 20s. And usually figure 180va per plug which is 1.5amps per plug. 80% of 20amps=16.16÷1.5 is over 10 receptacles. I wouldnt put more than 10-11 plugs on a 20amp circuit.

While good practice there is no code requirement to limit related to dwelling units. There was a discussion related to this on this forum in the past. While most would limit, but, code would "allow" a hundred or more.

 

[ptonsparky]

While good practice there is no code requirement to limit related to dwelling units. There was a discussion related to this on this forum in the past. While most would limit, but, code would "allow" a hundred or more.

Local requirements aside.

It's been cussed and discussed multiple times.

 

[roger]

(J) Dwelling Occupancies. In one-family, two-family, and
multifamily dwellings and in guest rooms or guest suites of
hotels and motels, the outlets specified in (J)(1), (J)(2), and
(J)(3) are included in the general lighting load calculations
of 220.12. No additional load calculations shall be required
for such outlets.

 

[James L]

(J) Dwelling Occupancies. In one-family, two-family, and
multifamily dwellings and in guest rooms or guest suites of
hotels and motels, the outlets specified in (J)(1), (J)(2), and
(J)(3) are included in the general lighting load calculations
of 220.12. No additional load calculations shall be required
for such outlets.

But doesn't that apply when calculating size of the service for the whole unit?

I don't see that as eliminating the need to calculate the load for a branch circuit.

 

[roger]

But doesn't that apply when calculating size of the service for the whole unit?

Actually it does.

III. Feeder and Service Load Calculations
220.40 General. The calculated load of a feeder or service
shall not be less than the sum of the loads on the branch
circuits supplied, as determined by Part II of this article,
after any applicable demand factors permitted by Part III or
IV or required by Part V have been applied.

 

[markwilkie]

Local requirements aside.

It's been cussed and discussed multiple times.

True, there is no limit in resi. But thats the route i would approach. I differs from house to house. People with no central air often plugs in space heaters or a.c. in when needed. In that case, you need a 20a circuit per room.

 

[James L]

True, there is no limit in resi. But thats the route i would approach. I differs from house to house. People with no central air often plugs in space heaters or a.c. in when needed. In that case, you need a 20a circuit per room.

Yes, it's situational.

 

[tallgirl]

But doesn't that apply when calculating size of the service for the whole unit?

I don't see that as eliminating the need to calculate the load for a branch circuit.

Other than the required branch circuits, what is the load for a branch circuit? Even @markwilkie 's comment is a hypothetical.

We did this once before where some hypothetical 400A service was fully utilized inside the dwelling -- meaning, 400A @ 240VAC -- and the 96kW caused the house to catch fire, assuming reasonable wall and attic insulation. 2kW per room is a lot of load. Space heaters, blow dryers and things like hot plates or microwaves are about the only loads which can reach that. It's just a hard thing to do without knowing how the owner is going to use the space.