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SWITCH IN THE MIDDLE OF A CIRCUIT
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Figure 7-5 illustrates a single-pole switch in a middle of a circuit controlling a lamp at the end The hot black wire is attached to the lower brass screw The power passes through the switch and goes 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
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LAMP IN THE MIDDLE OF A CIRCUIT
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Figure 7-6 illustrates a single-pole switch at the end of a circuit controlling a lamp in the middle of the circuit This circuit is wired as in the switch loop of Fig 7-3 The
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BRANCH CIRCUIT DESIGN AND DEVICE WIRING
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Figure 7-4 Lamps at the ends of circuits: (a) A circuit ends at a lampholder with a pull-chain switch; (b) a circuit with a lampholder at the end is controlled by a single-pole switch
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black hot input wire and its black-marked extension go to the lower brass screw on the switch Power passes through the switch to the upper brass screw and a black output wire that goes to the lampholder The white neutral wire bypasses the switch and goes directly to the lampholder In this circuit, two or more cables can enter the octagonal fixture box and the hot and neutral wires go to the next outlet
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Figure 7-5
Switch in the middle of the circuit
LAMP IN THE MIDDLE OF A CIRCUIT CONTROLLED BY THREE-WAY SWITCHES
Figure 7-7 illustrates how a pair of three-way switches can control a lamp in the middle of the circuit from two different locations This circuit allows the lamp to be switched on from either the top or bottom of a stairway, or from either end of a hallway It can be switched off by the second switch Each three-way switch has three screw terminals, one painted to identify it as common and the other two interchangeable as traveler or return terminals The three-way switch also contains a movable blade The hot black wire goes to the common terminal on the lower three-way switch After power passes through the switch, it leaves by the upper common terminal through a black-marked white wire to the upper common terminal of the upper three-way switch Again, power passes through that switch to the common terminal to a third black hot wire that takes it to the lampholder The white neutral wire bypasses the lower switch and goes directly to the lampholder The common red traveler wire connects the two screws not functioning as common As stated earlier, a lamp in a three-way circuit will be on only when both switch toggles are in the same positions, either up or down
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Figure 7-6
Lampholder in the middle of the circuit
LAMPS AT THE ENDS OF CIRCUITS CONTROLLED BY THREE-WAY SWITCHES
Figure 7-8 illustrates one way a pair of three-way switches can control a lamp at the end of the circuit from two different locations The black hot wire spliced to a black-marked white hot wire in the octagonal fixture is attached to the lower common screw on the upper three-way switch The power passes through the switch to a black-marked white hot wire that goes to the corresponding terminal on the lower three-way switch After power passes through the switch, it leaves by the lower common terminal on a black hot wire to the lampholder Again, the neutral wire bypasses both switches, and the red traveler wire connects the third terminals on both three-way switches Figure 7-9 illustrates a second scheme for controlling a lamp at the end of the circuit from two locations The black hot wire from the source goes to the common terminal of the lower three-way switch After power passes through the switch, it goes by a second black hot wire to the upper common terminal on the upper three-way switch After passing through the second switch, it goes by a third black hot wire from the lower common terminal to the lampholder The white neutral wire bypasses both switches and goes directly to the lampholder As in the previous example, a red traveler wire connects the third terminals on both three-way switches
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