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Publication of TM , 3 May supersedes FM , Theater of Operations Electrical TM is identical to that of the superseded FM 5- Field Manual (FM) , “Theater of Operations Electrical Systems, ” is intended for use as a training guide and reference text for engineer personnel who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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When they are connected in parallel, one set can be shut down and serviced while the others continue to operate. When a conductor is too small in diameter to carry the current demanded, the cable may overheat and cause the insulation to burn.

Consequently, conduit layouts and runs should be planned to use the 5-42 amount of conduit possible and also to keep the conductor runs to each outlet short enough to maintain a low voltage drop. Complete the following steps in sequence to determine the cable size required: May 17, ISBN: The two types of fittings are the standard, ordinary-size outlet box and the small junction or pull boxes called condulets.

FM Theater of Operations Electrical Systems – Maintenance

Additional operators and maintenance personnel may be required if several small sets replace a large one. Provide adequate shelter for generators that will be in service at one location for a long period of time.

This procedure requires a large amount of additional splicing to be made in the boxes and requires that you take more time in wiring. Item s unavailable for purchase. When it is difficult to install an effective grounding system because the soil is frozen, connect the grounding strap to something that is already grounded, such as a metal building or an underground pipe. If possible, attach the strap with a grounding clamp; if not, attach it with a bolt.

The load-bank method is preferred because it lets the operator set up and control the power specifications. Thus, a three-phase, three-wire, volt load can be connected to all three wires. The process of bending requires less effort, and the ends do not have to be threaded.

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Overlubrication causes overheating and leakage, and oily or greasy equipment surfaces collect dust and abrasive materials in the air.

Conduit-bending forms are also available as built-in units of pipe-vise stands. Operators can correct most equipment failures or unsatisfactory performance.

Because of restrictions, you must ground most flexible conduit systems by running a separate grounding wire along with the circuit conductors.

A floating ground is indicated when fuses are blown on the phase side of a circuit a number of times, and a circuit test shows no defects in the system. The fuel supply is stored outside the revetment to minimize the hazards associated with fuels at high temperatures. For short runs with few wires, you can pair conductors and push them through the conduit run from box to box.

Construct a revetment doorway shield that is similar to a revetment wall. The numbers cast on the bender shaft are inch measurements that you can use to check the depths of offset bends. First, ensure that the free-device wires at each box are not inadvertently touching each other or the metal box.

Contact with the earth does not guarantee a good grounding system. A lean-to, a shack, or a shed can adequately shelter generating equipment. This plate is located inside the main control-panel cover. Always use cutting oil when cutting pipe. Follow the troubleshooting procedures outlined in Table when a malfunction occurs or a fuse repeatedly blows.

Normally, the smaller sizes of pipe are threaded with dies that 5-4224 a thread for every turn of the die. Underground or wet installations require the insertion of lead-covered cables in galvanized conduit for permanent protection.

FM Theater of Operations Electrical Systems – Generators

Figure shows the procedures for determining the cause and location of a malfunction in a circuit. Loads are classified as inductive or resistive.

For example, the electrical load at a headquarters building that consists of lights and single-phase motors can be supplied by a small, single-phase generator set. Replace damaged electrical parts, components, and conductors immediately. Inductive loads such as partially loaded transformers and induction motors produce a power factor less than 1. The size of conduit is determined by the inside diameter. One electrician pulls the conductors through the conduit, while the other feeds the conductors into the conduit.


Locate all structures that require electrical power and mark them on a map. This technical manual TM is intended for use as a training guide and reference text for engineer personnel who are responsible for planning and executing theater of operations TO construction. The demand load is usually less than the connected load because all equipment in a building seldom operates at one time.

You may also be able to make a temporary ground by driving a spike deep into a large tree. The idea of these testers is quite simple. Have someone turn the light switch on and off. Loose, partly contacting, or partly broken connections at the screw terminals or splices of an electrical device can 5424 short circuits, arcing and burning, and radio interference. Keep the soil around the rod moist at all times.

The main generator fails to build up rated voltage. Generator sets have gasoline or diesel engines. This simulates the ON position and thereby extends the circuit test to include the wiring from the switch to whatever it will control.

Tighten the locknuts against the boxes so that the teeth will dig into the metal sides of the boxes. Adjust the frequency rheostat rm the incoming set until the kilowatt meter indicates one-half of the power of the base set.

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The tests can be applied at frequencies ranging from 50 to 1, cycles per second. This system supplies power directly to small loads such as lighting in barracks.

Conduit, however, has the capacity to accommodate several conductors in one run.