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WIRES AND WIRING
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Bends made on the job
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FIGURE 8-17 Bends of factory elbows compared with bends made on the job
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CHAPTER EIGHT
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TABLE 8-2 Rigid Conduit (90 Bends) Rigid Conduit Size (in) 1/2 3/4 1 11/4 NEC Radius (in) 4 5 6 8 90 Gain (in) 25/8 31/4 4 55/8
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Saddle when a small obstruction, such as a pipe, must be crossed by the conduit It may be necessary to use two offsets to cross some larger objects See Figure 8-20 and Table 8-5 Stub-ups the short ends of the conduit that stick up after a longer piece has bent See Table 8-6 Take-up the amount of conduit the bender will use to form the bend Bender manufacturers usually list their particular product s take-up distances on the side of the device See Table 8-7
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FIGURE 8-18 (A) Hickey for bending conduit (B) Hickey in use
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45 bend Offset Offset depth Air duct
45 bend
Note: If possible, always install conduit offsets and saddles over an object rather than under it This avoids pockets in which water can settle A Conduit strap Offset Conduit hub Outlet box or cabinet
Finished wall
A Air duct C
Offset depth
FIGURE 8-19 (A) Bends offsets over a heat or air duct (B) Box or cabinet offset (C) Closer look at bends for air duct
CHAPTER EIGHT
TABLE 8-3 Conduit Offsets Measurements Offset Depth (in) 1 2 3 4 5 6 7 8 9 10 Distance Between Bends (in) 6 51/4 6 8 7 81/2 93/4 111/4 121/2 14 Angle of Bends (degrees) 10 221/2 30 30 45 45 45 45 45 45 Conduit Length-Loss (in) 1/16 3/8 3/4 1 17/8 21/4 25/8 3 33/8 33/4
BOXES
Boxes are used to make connections of wiring or to mount switch boxes and xtures There are many types of metallic and nonmetallic boxes Nonmetallic PVC switch boxes and receptacle boxes are used in residential wiring The roughing-in time can be reduced by using
TABLE 8-4 Typical Offset Multipliers Various Angles Angle (degrees) 10 15 225 30 45 Multiplier 576 386 261 200 141
WIRES AND WIRING Step 1 Step 4
Hand bender Step 2 Saddle Conduit Steam pipe
FIGURE 8-20 Steps in bending to have conduit go over or under a steam pipe
Step 3
these boxes, inasmuch as they have their own connectors molded into the box They can also be used in remodeling old work See Figure 8-24 When you install an old work box into hollow walls, two arms swing out behind the wall Tighten two screws and the arms draw
TABLE 8-5 Saddle Bending Minimum Length (in) E-C 20 20 20 20 20 20 20 20 Bend Spacing (in) C-C 16 16 16 157/8 153/4 155/8 151/2 151/2 Bend Degrees No 1 6 7 8 10 121/2 15 18 20 Bend Degrees No 2 6 7 8 10 121/2 15 18 20 Bend Degrees No 3 12 14 16 20 25 30 36 40
Straight-Run Conduit (in) 1 11/4 11/2 2 21/2 3 31/2 4
CHAPTER EIGHT
TABLE 8-6 Stub-ups Dimensions Various Sizes of Conduit
Pipe and Conduit Size (in) Y (in) 1/2 3/4 1 11/4 11/2 2 21/2 3 31/2 4
Radius of Bend R (in) 4 41/2 53/4 71/4 81/4 91/2 121/2 15 171/2 20
Developed Length 90 (in) 65/16 71/16 9 113/8 13 1415/16 195/8 239/16 271/2 317/16
Gain X (in) 111/16 115/16 21/2 31/8 31/2 41/16 53/8 67/16 71/2 89/16
/ 2 Gain Y (in)
/ 11/4 9 1 /16 13/4 2 211/16 33/16 33/4 41/4
/8 15 16
tightly against the wall Installation is completed with a few turns of the screwdriver A template is included in the box to ensure an accurate cut in the wall The swing-arm box can be used with wall material from 1/4-inch to 5/8-inch thick or from paneling to drywall A cable clamp is molded into the box Just push the wire in and pull back slightly to activate the clamping action
TABLE 8-7 Conduit Take Up EMT (in) 1/2 1/4 1 11/4 Rigid Conduit* (in) 1/2 1/4 11 Take-Up (in) 5 6 8 11
Amount of take up for 90 bends with one-shot benders * IMC and Rigid will be the same
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A Footrest
Handle Bender arrow Take-up mark 18" Mark 5" B Lip or hook 18"
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