Electrician's Pocket Manual (Pocket References by Rex Miller

By Rex Miller

Entire, compact and that includes formulation, tables, and diagrams as opposed to long textual content descriptions, this convenient reference provides job-essential details in a short look-up structure. the recent moment variation has been up-to-date to incorporate the 2005 nationwide electric Code, new symbols for electric drafting now getting used in CAD drafting, extra assurance of co-axial cable in domestic wiring, and extra on electrical vehicles and controls.

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Electrician's Pocket Manual (Pocket References (McGraw-Hill))

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A typical hard-wired system with fire and security systems wired together (NuTone). , 60 Hz S-120 (135°F) Heat detector or S-121 (200°F) 10 KΩ Circuit sentry Blue Orange supplied with S-154 must be connected across end of fire detection circuit Fire Detection Circuit Any number of S-110’s, S-120’s, S-121’s and S-129’s can be connected across fire detection circuit S-120 or S-121 S-129 Any number of S-112’s, and/or S-117’s can be connected in intruder detection circuit Closed loop Intruder Detection Circuit S-113 Inside shunt switch 18 Ga.

Inadequate power supply. Undersized supply lines. High-resistance connections. Each phase lead run in separate conduits. Overload Relays Tripping Upon starting (Also see “Slow Starting”) Slow starting. (10–15 seconds or more) due to high inertia Load. Low voltage at motor terminals. (a) If the unbalanced current pattern follows the input power lines, the problem is in the power supply. (b) If the unbalanced current pattern follows the motor leads, the problem is in the motor. Correct the voltage balance of the power supply or replace the motor, depending on answer to (a) & (b) listed earlier.

The exact positioning of the switch depends on the type and design of the door or window. If possible, the switch should be installed in the frame on the hinge side of a door, and on double-hung windows, both top and bottom sections should be protected. Remember, the mounting area must be large enough to accommodate the flange of the switch. See Figures 4-6 and 4-7. Magnetic-operated reed switch assemblies are available for horizontal or vertical surface mounting on wood or metal doorframes or S-112 S-117 S-115 S-112 S-115 S-117 S-112 FIGURE 4-6.

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