Back at the lights the source neutral is connected to the neutral terminal on L1 and spliced with the white wire running between the fixtures. At each light it’s connected to the neutral terminal. At SW1 the red and white wires from the 3-wire cable running between switches function as the travelers with the white marked for hot using black tape or paint.
If the switch is good and things still don’t work, check the wiring to be sure the hot source is connected to a common terminal and the light fixture hot is connected to a common terminal. Likewise, be sure the traveler terminals are connected between switches only and not to any hot wires or the load.
This is another option for wiring a combo device where two sources are used. In this arrangement the connecting tab between the hot terminals on the device is broken off to separate the two. The switch controls a light and the receptacle half of the combo device is always hot.
A 30 amp circuit was once the norm for large, high voltage appliances like kitchen ranges. This type of receptacle provides 240 volts and 30 amps of current. The smallest cable allowed for used with a 30-amp circuit is 10 gauge, but 8 gauge may also be found. A 3-conductor cable is needed to carry a total of 240 volts and a neutral return. The circuit is wired to a dedicated 30 amp circuit breaker.
Also be sure the neutral from the source is connected to the neutral terminal at the light. A neutral wire will not be connected to the switches in these circuits, although some smart switches may make use of a neutral wire to operate the device.
At the receptacle the black cable wire from SW1 is connected to one of the hot terminals and the red wire is spliced to the white wire on the 2-conductor cable running to SW2. The white wire is wrapped with electrical tape to mark it as hot. The black wire is connected to the second hot terminal on the receptacle and to the top terminal on SW2 at the other end.
There are two sets of terminals on a ground fault circuit interrupter (gfci) receptacle: the line terminals and the load terminals. The source from the circuit should be connected to the line terminals and any standard duplex outlet or other device connected to the load terminals will be protected by this gfci.
This is the oldest version of a wall receptacle that you will find. It lacks a grounding contact and the plug slots are both the same size. These devices did not make use of a ground wire and both plug slots were treated the same. The wires used with these receptacles were usually both black.
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