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5424Ch14 - FM 5-424 CHAPTER 14 Maintenance The rules and...

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FM 5-424 Maintenance 14-1 CHAPTER 14 Maintenance The rules and routines outlined for a maintenance program for any electrical wiring system are determined primarily by the selection, location, and instal- lation of the original equipment installed. Maintenance is merely a system of routines designed to keep the equipment in satisfactory operating condition through periodic inspection, cleaning, testing, tightening, adjusting, and lubri- cating. These basic maintenance operations should be set down in the above- listed order, and the various duties should be delegated to specific electrical personnel to prevent operating breakdowns. This chapter reviews and outlines the various procedures and recommended practices necessary to perform maintenance and troubleshooting. Section I. Preventive Maintenance INSULATION The insulation materials designed to shield or protect the conductors from accidental contact with other conducting substances are built into the conductor during manufac- ture or may be installed in the field as part of the system's installation. Since it is important to maintain these protective coat- ings or shields on the wire conductors, ensure that preventive maintenance includes periodic tests and checks to expose potential trouble locations where the wire insulation has become frayed or where pro- tective devices have been damaged. Tape, repair, or replace such wire areas and loca- tions as required. Conductor shielding installed in the field (such as antishort bushings and damage protection) should always be maintained and should be replaced when dislodged or damaged. To ensure a trouble-free system, routinely inspect and maintain conductors and conductor-enclosure supports. Replace damaged electrical parts, components, and conductors immediately. LOOSE FITTINGS To avoid the possibility of short circuits, the maintenance organization responsible for power distribution in an electrical system should periodically spot-check the electrical
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FM 5-424 14-2 Maintenance fittings. These fittings include such items as conduit couplings, connectors, and box-entry devices. Check fittings for looseness or separation and tighten or reclamp them as necessary. CAPACITORS Since the static capacitor or condenser remains charged after being disconnected from the energy source, you must not inspect it and work on it until it is com- pletely discharged. CONDUCTOR CONNECTION The conductor connections made to electri- cal devices or other conductors should also be included in the periodic maintenance checks to determine the condition of solder splices, wire taps, and terminal connections. Loose, partly contacting, or partly broken connections at the screw terminals or splices of an electrical device can cause short cir- cuits, arcing and burning, and radio inter- ference. This may result in the rapid oxidation of the connecting materials or a dangerous short circuit if the free wire con- tacts other metallic components that are grounded. Moreover, the increased resis- tance resulting from a loose or poor connec-
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