This part is no different from the case where the power enters the switch box first. In the case of several lights controlled by a single switch, the converted white conductor from the line side of the switch goes to one fixture, and then another cable goes from there to the second fixture, to the third, etc. Two lights with single pole switch power in light box Tim Palmer - Logs to lumber 95K views How to Wire a 3-way Switch with Power to Light and 2020 NEC 404.2 (C) Sparky Channel. The white should be marked with a piece of black tape to indicate it is a hot, even though it will be hot only when the switch is on. Wiring first runs from the power base to the first. (White is usually neutral.) At the switch the black of the second cable is connected to the line connection and the white to the load connection. However, in a three-way switch, there is an extra wire that allows the two switches to connect together. The white of the second cable is connected to the hot connection on the fixture and marked with a piece of black tape to indicate that it has been "converted" to a hot. In the latter case, the neutral of the line (white in the US) is connected to the neutral connection of the fixture, and the hot of the line (black) is connected to the black of a cable going to the switch. The switch controls the light even though it would not at first glance appear to be "between" the two, but actually it is. Two-way switching uses a COM, L1, and L2 terminal. This allows you to switch the light on or off from either location. For instance, in the case of a staircase, you can install one switch at the top and another switch at the bottom. The power for the circuit joins the light fixture F1 via the cable C5. Two-way switches allow consumers to control the same light using two different switches. But it is sometimes the case that the line power cable first enters the box of the light fixture and then goes to the switch. Two lights between 3 way switches (power via a light). The pigtail method means you use a 6-inch black spare wire to twist all the black wires together. By analogy with water pipes it is easy to see that the switch can control the light because it is "between" the two. The best way to make this connection is by using a pigtail. Most commonly the line power enters the box with the switch and then goes to the light fixture. However, if the fixtures are wired in a series connection, you will need the help of an electrician.
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