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5/8" 8' Ground rod
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Note #9
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FIGURE 7-14 Standards for a farm meter
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6" minimum below final grade
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CHAPTER SEVEN
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TABLE 7-1 Dimensions and Knockout Information for QC and Homeline Load Centers (Square D)Dimensions W Box No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 in 381 481 481 888 1425 1425 1425 1425 1425 1425 1425 1425 588 1425 2000 2000 2000 588 756 962 888 856 mm 97 122 122 226 362 362 362 362 362 362 362 362 149 362 508 508 508 149 192 244 226 217 in 672 930 930 1257 1492 1792 2092 2604 2986 3378 3798 3937 1312 2092 5000 6800 5300 1612 2312 2612 1480 2392 H mm 171 236 236 319 379 455 531 661 758 858 965 1000 333 531 1270 1727 1346 409 587 663 376 608 in 300 319 319 380 375 375 375 375 375 375 375 375 338 375 575 575 575 338 425 475 380 895 D mm 76 81 81 97 95 95 95 95 95 95 95 95 86 95 146 146 146 86 108 121 97 100
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Table 7-1 shows the dimensions and Figure 7-15 shows the box number and the location of the knockouts
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LOW-VOLTAGE POWER
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Most low-voltage systems use transformers from the 120-volt or 240-volt line and step down the voltage to either 16 volts or 24 volts to be used within a building as signaling or remote control circuits Chimes or doorbells use a step-down transformer to take 120 volts down to 16 The wiring is usually a two-conductor or three-conductor 18 wire The low-voltage switching may be a number of pushbutton
POWER SOURCES
Knockouts Symbol A B 3/4 C 1 D 11/4 E 11/2 F 2 G 21/2 H 3 I 31/2
Conduit 1/2 size A
A,B,C,D A A,B,C A A,B,C
A,B,C A
A BOX 1 B,C,D,E B,C,D,E BOX 2 B,C,D,E C,D,E,F
A,B BOX 3 C,D,E,F,G A A,B B,C,D,E
A,B B,C,D,E
A,B A A B,C,D,E B,C,D,E BOX 4 BOX 5 B,C,D,E B,C,D,E C,D,E,F C,D,E,F,G A A,B B,C,D,E A,B A,B A A C,D,E,F C,D,E,F,G A A,B B,C,D,E B,C,D,E A,B,C,D
A,B,C,D BOX 6 BOX 7
A,B,C,D
FIGURE 7-15 QO and Homeline Load Centers Knockout information and enclosure dimensions (Square D)
CHAPTER SEVEN
C,D,E,F,G B,C,D,E B,C,D,E D,E,F,G B,C A,B C,D,E,F,G A A,B C,D,E,F D,E,F,G
B,C,D,E C,D,E,F
A A,B
B,C,D,E BOX 8
A,B,C,D
C,D,E,F BOX 9
A,B,C,D B,C,D,E
B,C,D,E B,C,D,E D,E,F,G B,C A,B
C,D,E,F,G
A A,B C,D,E,F D,E,F,G
B,C,D,E B,C,D,E D,E,F,G B,C A,B
C,D,E,F,G
A A,B C,D,E,F D,E,F,G
C,D,E,F BOX 10
A,B,C,D B,C,D,E
C,D,E,F BOX 11
A,B,C,D B,C,D,E
FIGURE 7-15 (Continued)
POWER SOURCES
B,C,D,E B,C,D,E D,E,F,G B,C C,D,E,F,G A A,B C,D,E,F D,E,F,G
A,B C,D,E,F A,B,C,D A
C,D,E,F BOX 12
A,B,C,D B,C,D,E BOX 13
A,B A,B,C A A,B B,C,D,E C,D,E,F D,E,F,G C,D,E,F
D,E,F,G,H D,E,F,G,H,I
A,B,C,D B,C,D,E BOX 14 BOX 15, 16, 17
FIGURE 7-15 (Continued)
CHAPTER SEVEN
C,D,E,F C,D,E,F E,F,G,H
A,B,C,D
D,E,F,G
D,E,F,G
BOX 18
BOX 19
BOX 20
A,B B,C,D,E
B,C,D,E B,C,D,E
A B,C,D,E B,C,D,E BOX 21 A,B C,D,E,F BOX 22
B,C,D,E
FIGURE 7-15 (Continued)
types This same voltage may be used in control circuits for garage door openers and certain burglar alarm systems A low-voltage transformer is used to obtain 24 volts for use in controlling the hot-air furnace that heats the house or, in some-cases, stores and other commercial and industrial plants The main advantage of these control circuits is that they can use 18 wire for short runs and then move up to 16 or 14 for longer distances Low-voltage signaling and remote control circuits are covered by the NEC Article 725 Class 1, Class 2, and Class 3 circuits are detailed as to voltages and currents allowed Low voltage is also used in modern construction and home lighting systems General Electric makes a system that has found wide use Inasmuch as it is low voltage and low current, the wiring
POWER SOURCES
requirements for relay switching circuits are small, exible wires that may be snaked in thin wall or steel partitions without the protection of metal raceways (except where local codes prohibit such installation) Wires can be dropped through hung ceilings into movable partitions as easily as rewiring telephones In fact, wiring can be placed under rugs to switches located on desks and easily changed when required The switches are modern in appearance and very compact The low-voltage circuits are simple, and one that can be easily followed is seen in Figure 7-16 It shows the basic circuit, one transformer, one relay, and one switch controlling a load The red, white, and black wires from the switch to the relay and transformer are usually 20 AWG This means they can be run longer distances for less cost than conventional wiring Figure 7-17 shows the basic circuitry for a remote control system The recti er diode is used to change the 24 volts from alternating current (AC) to direct current (DC) This produces less noisy relays no AC hum The power supply for the General Electric system (used here as an example there are others) is a 24-volt transformer connected to a 120-volt line It can also be obtained to operate from 277 volts The relays in Figure 7-18 are the mechanical latching type That means the switching circuits require only a momentary impulse These relays have a coil design that resists burnout due to equipment or operational failure They can control 20 amperes of tungsten, uorescent, or inductive loads at 125-volt AC and 277-volt AC They can also be used for 1/2-horsepower, 240-volt AC and 11/2-horsepower, 125-volt AC motors Some relays are available
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