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Subject - New Circuits
jim53142 My house was built in 1928,as I redo each room I have been spliting each room off on its own because the whole house was ran on 4 circuits. In order to be to code, how many oulets and switches can be on 1 circuit? Question #2 is it ok to have a 15 amp switch on a 20 amp circuit. Question #3 is it ok to have a 15 amp outlet on a 20 amp circuit. Any help would be appreciated.
kbsparky The Code does not specify a maximum number of outlets per circuit in a dwelling. Rather, you are supposed to install a sufficient number of circuits to handle the calculated "lighting" load, which is set at a minimum of 3 watts per square foot.

Depending on whether you install 15 or 20 Amp circuits, determines the minimum number of circuits required. The folks who write the Code want you to install as many outlets as you want, reducing or eliminating the need for the use of extension cords.

As for those 15 Amp switches on 20 Amp circuits, this can be a mixed bag. In my area, as long as the load you are controlling does not exceed the rating of the switch, you are fine.

The use of 15 Amp receptacles on a 20 Amp circuit is a bit more complicated. You have to have more than 1 outlet per circuit to be allowed to use the 15 Amp outlets. And, you won't be allowed to draw more than 12 Amps at any one outlet to be in compliance. See NEC 210.21(B)

The reverse of that situation is not allowed. You can't install a 20 Amp receptacle on a 15 Amp circuit. But you are allowed to install a 20 amp switch on a 15 Amp circuit.

Go figure
David Hyatt Jim, per code in a house you can put 100 receptacles on a circuit, not that I would recommend that. Use good judgement. 2) yes 3) Only if there is more than one outlet on that circuit. Meaning not dedicated to one load.