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electrical wiring against physical harm Installation of rigid metal conduit, IMC, and EMT, sometimes referred to as thin-wall conduit, requires that provision for making changes of direction in the conduit runs ranging from simple offsets at the point of termination at outlet boxes and cabinets to complicated angular offsets at columns, beams, cornices, and so forth Sometimes contract speci cations dictate otherwise, but changes in direction are made, particularly in the case of small diameter conduit, by bending the tubing as required In the case of 11/4 inch and larger sizes, right-angle changes of direction are sometimes installed with the use of factory bent elbows or conduit bodies In most cases, however, such changes in direction are made more economically by using conduit bent in the eld A good reason for making on-the-job bends is multiple runs of the larger conduit sizes This is because truer parallel alignment of multiple runs can be maintained by using on-the-job conduit bends rather than factory elbows Such bends can all be made from the same center, using bends of the largest conduit in the turn as the pattern for all the other bends Most conduit and raceway systems are run exposed Learning to install neat-looking conduit systems in an ef cient and workmanlike manner is the hallmark of a good electrician Every electrician working on commercial and industrial electrical installations must learn how to calculate and fabricate conduit bends That means the operation of both hand and power conduit benders take pride in performing the best work possible
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NATIONAL ELECTRICAL CODE
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The NEC requires that metal conduit bends must be made so that the conduit will not be damaged during the installation and during operation The Code also requires that the internal diameter of the conduit will not be effectively reduced in size To accomplish this, the Code, further speci es that the minimum radius of the inner edge curve of a conduit bend be at least six times the internal diameter of the conduit when conductors without lead sheath are installed See Fig 8-16 The reason for this rule is: when the inside of an elbow is less than six times the inside diameter, wire pulling
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WIRES AND WIRING 2" diameter rigid, IMC, or EMT
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Approx 6 diameter of the conduit 12"
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A For conduit containing conductors without lead sheath 2" D
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21 "
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B For conduit containing lead-sheathed conductors
FIGURE 8-16 (A) 2-inches rigid, IMC or EMT bend radius (B) Radius of 90 bend
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CHAPTER EIGHT
becomes dif cult That means the insulation on the conductors may be damaged When lead sheath conductors are to be installed, the inside must be increased according to NEC Table 346-10 See Fig 8-16B The NEC further states that no more than four bends (360 ) total may be made in any one conduit run between boxes, cabinets, panels, or junction boxes That is, between pull points
CONDUIT TERMINOLOGY
In case you haven t seen them before, or need to refresh your memory, here are some of the terms encountered when working with conduit Circle a closed curve line point, the points of which are all the same distance from the center The circumference of a circle is found by multiplying the diameter by the constant pi Pi (p) has a value of 314159 Or, C = p D, where C is the circumference and D is the diameter Elbow an ell or a 90 bend that is made when a conduit must turn at a 90 angle Factory elbows are available already bent Figure 8-17 shows how factory elbows are used, and how onthe-job bends can be made for a neater look Gain the distance saved by the arc of a 90 degree bend By knowing the gain you can precut, ream, and pre-thread both ends of the conduit before the bend is actually made A typical gain table is shown in Table 8-2 Hickey designed for bending small sizes of rigid conduit The hickey is not to be confused with a hand bender See Figures 8-18A and Fig 8-18B Kick a change in direction of the conduit, but at a small angle The rst bend in and offset is really a kick Little kicker a hand-operated device used to make offsets in EMT Offset when two 45 bends are used and when the conduit must run over, under, or around an obstacle An offset is also used at outlet boxes, cabinets, panel boards, and pull boxes as can be seen in Fig 8-19and Table 8-3 and Table 8-4 Right angle an angle that contains 90 Remember that a circle has 360
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