Publication of TM , 3 May supersedes FM , Theater of Operations Electrical TM is identical to that of the superseded FM 5- Field Manual (FM) , “Theater of Operations Electrical Systems, ” is intended for use as a training guide and reference text for engineer personnel who are. *This publication supersedes TM , 23 August , and FM , 9 October Field Manual. No. Headquarters. Department of the Army.
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As outlined in Chapter 3the inspection checks include normal operation and operation under the rated load.
Allow a clearance of 4 to 6 feet if you use combustible materials. The new load is connected to the additional circuit. Using a steady and continuous force, firmly hold the conduit and bender with the bending groove over the conduitpush down on the handle, and step on the footstep to bend the conduit 55-424 the desired angle. Conduit should be run as straight and direct as possible.
Generator sets are shut down and serviced periodically. The sum of the inductive and noninductive loads is the connected load for the entire installation. Enter Your Email Address. Sets that produce more than 60 kilowatts of power must be transported in 5-ton trucks. Most electrical loads in the US require a frequency of 60 cycles. Good 5-44 facilities can reduce the time required for wiring installation because damaged conduit, fittings, cable, and supports can create time-consuming problems on the job.
You may use a two- or three-wire system, depending on the size of the load and the area serviced. Use the proper clamps and connections for the grounding system selected. Consequently, conduit layouts and runs should be planned to use the minimum amount of conduit possible and also to keep the conductor runs to each outlet short enough to maintain a low voltage drop.
Bends in rigid conduit must be made without collapsing the conduit wall or reducing the 5-244 diameter of the conduit at the bend. Install the generator set so that its long axis is parallel with the long axis of the revetment. By using unions, conduit may be started from two outlets and joined together at any convenient place in the run. The main generator overheats.
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In an AC system, both wires of a circuit are encased in a single conduit, thereby causing the induced current of each to balance and cancel each other. Consequently, if this conductor was isolated in an iron or steel conduit, the conduit would be heated by the induced current.
The maximum allowable voltage drop for lighting and power loads is 5 percent. Place the paralleling switch on the control panels of the base and incoming generator sets in the ON position. One form contains a battery and a light; another uses a battery and a buzzer or a bell. Tighten the locknuts against the boxes so that the teeth will dig into the metal sides of the boxes.
Single-phase equipment provides power for small lighting, AC and DC motors, special equipment such as radial arc electrical welders, and some furnace loads. Ensure that grounding rods are as straight as possible. Periodically inspect all operating devices in the wiring system for defects.
The radius of the curve on the inner edge of any field bend must be at least six times the internal diameter of the conduit for rubber- braid- or thermoplastic-covered conductors and at least 10 times the internal diameter of the conduit for lead-covered conductors.
Rigid conduit Figure has the same size designations as water pipe.
If you cannot do this, replace the pipe with an 8-foot-long electrode. Place the equipment near an oasis or subterranean water if possible. A single-phase, three-wire distribution system Figure has one grounded wire and two live wires.
The minimum allowable inside ffm for a revetment for generator sets rated from 1. If you need additional sets for parallel operations, plot them on the map. Use planks, timbers, logs, ammunition boxes, or other materials to prevent the skids or frame from sinking into soft earth. The tests can be applied at frequencies ranging from 50 to 1, cycles per second.
FM Theater of Operations Electrical Systems – Table of Contents
Maintenance, Troubleshooting, and Repair, Second Edition: Male and female adapters are available for transitions to other types of conduit and for box connections. The voltage and phase requirements are marked plainly on most AC and DC motors. This practice reduces the size of wire cable required, minimizes the line voltage loss, and provides voltage control at the demand end of the line.
When equipped with accessories such as an electric distribution system, this set produces all the power needed by 5-244 forces in the field. Black-enamel or galvanized rigid metal conduit is approved for use under most conditions and in most locations.
In grounds of this type, fuse trouble may not occur for several days; then the ground reappears and the fuses are blown again.
This allows no more than a 3 percent loss in the branch 5-42 and no more than 5-4224 2 percent loss in the main and feeder lines. This set is used when it is isolated from the distribution system and when equipment failure will not 5-442 affect the field unit’s mission.
The annual load factor of a well-operated, active field unit is 50 percent or more of the capacity of the generator sets. Use the projection on 54-24 head of the bender, sometimes called a foot stepto steady the bender in operation and reduce the pressure required on the handle.
Exposed thin-wall conduit is supported in a similar manner and with the same type of supports used with rigid conduit.