By Rex Miller

Entire, compact and that includes formulation, tables, and diagrams rather than long textual content descriptions, this convenient reference promises job-essential details in a brief look-up layout. the hot 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 insurance of co-axial cable in domestic wiring, and extra on electrical automobiles and controls.

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Clean external ventilation system—check fan. Blow out internal ventilation passages. Eliminate external interference to motor ventilation. Reduce ambient temperature or provide outside source of cooler air. Balance supply voltage. Check motor leads for tightness. Eliminate single-phase condition. Won’t Start (Just hums and heats up) Single phased. Rotor or bearings locked. Runs Noisy Under Load (excessive electrical noise or chatter under load) Slow Starting (10 or more seconds on small motors—15 or more seconds on large motors) Across the Line Start Single phased.

Green 18 Ga. 18 Ga. Blue Violet Outside (Key/ Lock) switch assy. S-119 Exit/Entry control S-154 supplies indicater lights in a maximum of 2 S-119's Yellow White Inside switch assy. 18 Ga. Green Violet Outside Key/Lock switch assy. 49 Sea note S-119 Note: Connect & matching color-coded wires between inside & outside assy’s. Use matching color-coded 3-Pr. cable (NuTone 447 or 448) for greater spacing. FIGURE 4-2. Wiring for a typical security or fire system. 50 CHAPTER FOUR The control unit should be mounted between studs in a location with easy access from all rooms in the house; this is usually in a hallway.

Top-grade oils are recommended, since they are • • • • Refined from pure petroleum Substantially noncorrosive to metal surfaces Free from sediment, dirt, or other foreign materials Stable in the presence of heat and moisture encountered in the motor In terms of performance, the higher-priced oils often prove to be cheaper. If extremes in bearing temperatures are expected, special care should be exercised in selecting the proper lubricant. Special oils are available for motor applications at high temperatures and low temperatures.

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