FM 5-424 PDF

Publication of TM , 3 May supersedes FM , Theater of Operations Electrical TM is identical to that of the superseded FM 5- Field Manual (FM) , “Theater of Operations Electrical Systems, ” is intended for use as a training guide and reference text for engineer personnel who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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Air-cooled, engine-driven generator sets are designed to operate in the open with unrestricted ventilation. Adjust the voltage rheostats on both sets, if necessary, to eliminate crosscurrents. The amount of resistance to current flow that occurs along the cable is determined by the distance between the generator set and the load. No exceptions to the standard color coding of wires, as outlined in the other systems, are permitted in conduit wiring.

Since there is no positive link between the couplings, box connectors, and thin-wall conduit, ensure that each conduit joint is electrically and mechanically secure. Then go back to the incoming set and observe the paralleling lamps.

Generator sets are shut down and serviced periodically. Wire splices in conduit installations are not under tension; therefore, you can use a simple pigtail splice that is carefully made to obtain a good electrical joint. The most important thing to check for is a short circuitwhich results when two bare conductors of different potential come in contact with each other.

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Stop operating the equipment immediately if the deficiency could endanger personnel or damage the equipment. Do not try to heat PVC with a torch because you vm char the conduit.

The tests can be applied at frequencies ranging from 50 to 1, cycles per second. The individual demands for electrical power and the area to be serviced govern the site selected.


You may cut thin-wall conduit with a hacksaw or a special thin-wall cutter. When installing boxes and conduit runs, pull the conductor wires into the conduit. For example, if the load is more than a few hundred feet from the generator set, you may need a high-voltage distribution system. 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 5424 at least 10 times the internal diameter of the conduit for lead-covered conductors.

Since the outside and inside diameters of rigid conduit are the same as those of gas, water, or steam pipes, the standard thread forms, threading tools, and dies are used.

They allow the minimum space required for servicing and maintaining equipment. Keep the fj around f grounding system moist at all times.

FM Theater of Operations Electrical Systems – Maintenance

They are classified by the manufacturers as follows:. Use the following formula to determine the demand load when you know the demand factor: The total electrical load fluctuates constantly as equipment starts and stops.

The annual load has a power factor of 80 percent or more of the average power factor. Compute the connected load for each structure.

Medium Medium AC generator sets are driven by gasoline or diesel engines and produce between 3 and 10 kilowatts of electricity. Use Table B to determine whether the existing conduit can accommodate an additional wire. After steps 1 and 2 are completed, the incoming generator set may be synchronized with the base unit. There is no inductive reactance in a DC circuit regardless of the character of the load. Battery charging is the main use of DC generators. Benders are made for each size of conduit; therefore, use them only on those sizes for which they are designed.


Advanced Customization in Architectural Design and Construction. Large three-phase motors 5 HP or more usually operate satisfactorily between and volts. If the wiring is exposed, you should be able to see the problem by carefully checking the circuit.

FM Theater of Operations Electrical Systems – Table of Contents

The cross pieces should be about 8 feet long. When the synchronizing lamps blink in unison, the two sets are operating in parallel as one base unit. Any single-phase, two-wire, volt load can be connected to both the live wire and the grounded wire.

If necessary, drill, dig, or blast a hole in the soil and use the salt solution described previously. Newnes Rm Control Wiring Guide. A single-phase, three-wire distribution system Figure has one grounded wire and two live wires. The new load is connected to the additional circuit.

Provide a supply of clean fuel that is sufficient for all requirements planned for the life of the installation. To help maintain the operating temperature below the danger point, you must keep the equipment clean and dry.

Next, connect a 2-foot wire to the other terminal on the doorbell. Simply replace the damaged cord or plug before installing a new fuse or resetting the breaker. Follow the 5-42 procedures outlined in Table when a malfunction occurs or a fuse repeatedly blows.

Because only one magnitude of voltage is available from this kind of generator, the loads must require the same voltage. The size of conduit is determined by the inside diameter. The power in watts delivered by a DC generator set is the product of the current multiplied by the voltage.

Never connect the white wire to a black or substitute-color wire.