By Rex Miller
Entire, compact and that includes formulation, tables, and diagrams rather than long textual content descriptions, this useful reference provides job-essential details in a short look-up structure. the hot moment version 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 cars and controls.
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Entire, compact and that includes formulation, tables, and diagrams instead of long textual content descriptions, this convenient reference promises job-essential details in a brief look-up layout. 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 insurance of co-axial cable in domestic wiring, and extra on electrical cars and controls.
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Extra info for Electrician's Pocket Manual (Pocket References (McGraw-Hill))
Line PERMANENT-SPLIT CAPACITOR 4-LEAD— Reversible by transposing leads. Line TWO-VALUE CAPACITOR— Reversible only from rest (by transposing leads). TWO-PHASE 4-LEAD— Reversible by transposing either phase leads with line. FIGURE 3-1. (continued ) THREE-PHASE–SINGLE VOLTAGE—Reversible by transposing any two leads. 34 CHAPTER THREE Black White Yellow Green Line Line Red Blue 3-PHASE, STAR-DELTA, 6-LEAD REVERSIBLE— For 440 volts connect together white, yellow and green: Connect to line black, red and blue.
Figure 4-5 shows how to locate heat sensors. Heat detectors should be installed on the ceiling but, when necessary, may be mounted on a sidewall. When installed on a smooth ceiling, each detector will protect a 20-square-foot area. When installed on a wall, detectors should be at least 6 inches and no more than 12 inches below the ceiling and at least 12 inches from any corner. ALARM SYSTEMS 53 FIGURE 4-4. How the smoke or heat detector is wired to the control unit. 54 CHAPTER FOUR FIGURE 4-5. How to locate heat sensors.
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.
Electrician's Pocket Manual (Pocket References (McGraw-Hill)) by Rex Miller