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Figure 7-1 Wall switches can be identified by the number and color of their screw terminals: (a) A single-pole switch has three screw terminals (one grounding); (b) a three-way switch has three screw terminals; and (c) a four-way switch has four screw terminals
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output wires It was explained previously that single-pole toggle switches are the only wall-mounted switches with ON and OFF legends marked on their toggles If the switch is mounted correctly, ON is visible when the load is powered Single-pole toggle switches for use in nonmetallic switch boxes have a grounding screw, typically on the left side of the switch Neither the three-way switch shown in Fig 7-1b nor the four-way switch shown in Fig 7-1c has the ON/OFF toggle legends because they would have no meaning; the positions of the toggles on the other switches in the three- and four-way circuits determine the ON and OFF positions of any one switch in the circuit Each three-way switch has three screw terminals (one painted to identify it as common ) and an internal movable blade In wiring three-way circuits, as shown later in Figs 7-7, 7-8, and 7-9, a common traveler wire is connected between one of the brass terminal screws on each switch A lamp in a three-way circuit is OFF when one switch toggle is up and the other one is down By flipping one toggle of the pair so that both are either up or down, the circuit is completed and the lamp will turn on
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Figure 7-2 illustrates a lamp controlled by a single-pole switch The black input hot wire goes to the upper brass screw, power passes through the switch, and the black output hot wire goes from the lower brass screw to the lampholder The neutral wires bypass the switch and go directly to the lampholder With the switch between the hot wires, the lamp circuit can be made or broken A switch in the neutral wire could make or break the circuit, but it would not disconnect the lamp from the power source This
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Figure 7-2 Lamp controlled by a switch: The neutral wire bypasses the switch and goes directly to the lampholder
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scheme could expose a person to electrical shock, or a short circuit could occur at the lamp with the switch off
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Figure 7-3 illustrates a switch loop The NEC limits the number of wires allowed in a switch box To avoid this limit, circuit wires can be run to the lampholder first with a switch loop going to the switch, as shown The black hot input wire and its black-marked extension go to the lower brass screw on the switch Power passes through the switch and leaves from the upper brass screw on a black wire that goes to the lampholder The white neutral wire bypasses the switch and goes directly to the lampholder
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Figure 7-4a illustrates a circuit ending at a lampholder controlled by a single-pole pull-chain switch The black hot and white neutral wires go directly to the lampholder This wiring scheme is frequently used in unfinished attics and basements
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Figure 7-3 Switch loop: Circuit wires go to a lampholder first, with a loop going to the switch, minimizing the wires in the box
Figure 7-4b illustrates another example of circuit ending at a lampholder, but this circuit is controlled by a single-pole switch The hot wire connects the black-marked white extension to the lower brass screw of the switch Power passes through the switch and leaves from the upper brass screw on a black wire to the lampholder Again, the white neutral wire bypasses the switch and goes directly to the lampholder This wiring scheme is widely used in finished rooms
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