Download Electrician's Pocket Manual (Pocket References by Rex Miller PDF

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By Rex Miller

Entire, compact and that includes formulation, tables, and diagrams in preference to long textual content descriptions, this convenient reference provides job-essential details in a brief look-up structure. the recent 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 insurance of co-axial cable in domestic wiring, and extra on electrical vehicles and controls.

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However, under normal conditions, even a roomful of people smoking won’t trigger an alarm because smoke spreads out so that the concentration is very low. Figure 4-4 shows how the detector is wired to the control unit. There are two types of smoke detectors. In the photoelectric smoke detector, the smoke is detected as it interrupts a small light from a bulb inside the unit. This type is best at detecting thick smoke because that kind of smoke causes the light beam to be interrupted. This type of detector is used primarily in the home, since house fires are usually of the smoldering type with thick smoke.

Replace bearing—avoid: (a) Mechanical damage. (b) Excessive greasing. (c) Wrong grease. (d) Solid contaminants. (e) Water running into motor. (f) Misalignment or closecoupledapplication. (g) Excessive belt tension. 43 (continued) 44 TABLE 3-3 Motor Troubleshooting Guide (continued ) Symptom Mechanical Noise Possible Causes Driven machine or motor noise. Motor noise amplified by resonant mounting. Driven machine noise transmitted to motor through drive. Misalignment on close-coupled application Correction Isolate motor from driven machine— check difference in noise level.

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.

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