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Publication of TM , 3 May supersedes FM , Theater of Operations Electrical TM is identical to that of the superseded FM 5- Field Manual (FM) , “Theater of Operations Electrical Systems, ” is intended for use as a training guide and reference text for engineer personnel who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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FM Theater of Operations Electrical Systems – Generators

Operators can correct most equipment failures or unsatisfactory performance. The replacement ballast is already wired, and about 5 inches of each wire will be sticking out of the ballast.

All couplings and mf to boxes are threadless and are of clamp or compression type. Also, do not place other heat-generating equipment in a revetment with a generator set. Roof construction usually consists of two pieces of lumber 4 inches by 4 inches or logs 4 inches in diameterabout 10 feet long, and enough cross pieces of lumber, logs, or steel planking to cover the entire roof.

If the generator set is attached to a shipping pallet, the pallet provides an adequate foundation. Compute the power factor.

FM Theater of Operations Electrical Systems – Conduit Wiring

Map the field unit. This procedure requires a large amount of additional splicing to be made in the boxes and requires that you take more time in wiring. Table B lists the maximum number of conductors of a certain gauge that can be inserted in the various sizes of conduit used in interior wiring. 5-44 a fire point that includes a Class A fire extinguisher, a shovel, and a pickax.

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 completely discharged. Refer to the description and data section in the appropriate TM for information about a specific generator that is not on the plates. Three-phase, three-wire, volts. Military field units commonly use one of four systems: Red, blue, and orange insulated wires can be used as substitutes for black wire when wire combinations are combined in a conduit or a circuit.


In table models, the ballast is located in the base of the lamp; in ceiling or wall-mounted models, the ballast is in the metal enclosure that is attached to the ceiling or wall. Sign In Sign Out. Because most loads can be divided and balanced between phases, most medium- and large-sized generator sets are designed for three-phase operation.

Ensure that the voltage and frequency outputs of the incoming generator set are the same as those of the base set. These generators are usually mounted on skids to increase mobility.

Inductive loads such as partially loaded 5-4224 and induction motors produce a power factor less than 1. The amount and type of protection desired determines the thickness of the roof. No exceptions to the standard color coding of wires, as outlined in the other systems, are permitted in conduit wiring. If a large amount of conduit is being cut, a power hacksaw is recommended. The new load is connected to the additional circuit.

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Condulets Figure provide intermediate points in long conduit runs for the pull-through of wire or provide junctions for several concealed installations where they will not be accessible. The load bank is a self-contained test unit that is mounted in a cabinet and generates no power.

If you cannot do this, replace the grounding rod with an 8-foot electrode. Other considerations when selecting generating equipment for a field unit include Use planks, timbers, logs, ammunition boxes, or other materials to prevent the skids or frame from sinking into soft earth. Loads that occur during peak times may affect the capacity required for a generator set, while loads that occur during nonpeak times fmm not. To ensure that the power is balanced, connect the loads so that each phase receives an equal load of current from the generator set.


Larger sizes up to 6 inches are available for special use in certain commercial and factory installations. For proper maintenance under normal conditions, fixtures and lamps should be cleaned at least every 3 months. The annual load factor of a well-operated, active field unit is 50 percent or more rm the capacity of the generator sets.

How to Design, Fabricate, and Install. Editors of Cool Springs Press. This manual emphasizes the constructional aspects of electric wiring.

For example, if three No 10, Type R, and four No 8, Type R, conductors are to be inserted in a tm, their combined cross-sectional area obtained from Table B is 0. The fast buildup of corrosion is a problem in the tropics.

Provide an adequate number of supports according to Table B Distribution systems are classified according to the voltage used to carry the power from the power source to the distribution transformers or to the loads. When single-phase power is obtained from three-phase circuits, operators must balance each phase at the generator set.