TM 3-34.46 (FM 5-424/25 June 1997)/MCRP 3-17.7K THEATER OF .

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TM 3-34.46 (FM 5-424/25 June 1997)/MCRP 3-17.7KTHEATER OF OPERATIONSELECTRICAL SYSTEMSMay 2013Publication of TM 3-34.46, 3 May 2013 supersedes FM 5-424, Theater of Operations ElectricalSystems, 25 June 1997. This special conversion to the TM publishing medium/nomenclature has beenaccomplished to comply with TRADOC doctrine restructuring requirements. The title and content ofTM 3-34.46 is identical to that of the superseded FM 5-424.This special conversion does not integrate any changes in Army doctrine since 27 October 1997 anddoes not alter the publication’s original references; therefore, some sources cited in this TM may nolonger be current. For the status of official Department of the Army (DA) publications, consult DAPam 25-30, Consolidated Index of Army Publications and Blank Forms, athttp://armypubs.army.mil/2530.html. DA Pam 25-30 is updated as new and revised publications, aswell as changes to publications are published. For the content/availability of specific subject matter,contact the appropriate proponent.DISTRIBUTION RESTRICTION: Approved for public release; distribution is unlimited.

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TM 3-34.46 (FM 5-424)/MCRP 3-17.7KHeadquartersDepartment of the ArmyWashington, DC, 3 May 2013Technical Manual No. 3-34.46/MarineCorps Reference Publication 3-17.7KTheater of OperationsElectrical SystemsContentsPagePREFACE.xiPART ONEBASIC ELECTRICAL TECHNIQUESChapter 1FUNDAMENTALS. 1-1Usage . 1-1Drawing Symbols and Reading Blueprints . 1-2Color Coding . 1-4Splices . 1-4Insulation and Wire Connections . 1-5Job Sequence . 1-6Chapter 2TOOLS AND EQUIPMENT . 2-1Section I - Interior Wiring . 2-1Pliers . 2-1Fuse Puller . 2-1Screwdrivers . 2-1Wrenches. 2-1Soldering Equipment . 2-2Drilling Equipment . 2-2Woodworking Tools . 2-2Metalworking Tools. 2-2Masonry Drills . 2-2Conduit Threaders, Reamers, and Cutters . 2-3Insulation-Stripping Tools . 2-3Hammers . 2-3Tape. 2-3Fish Tape . 2-3Drop Chain . 2-3DISTRIBUTION RESTRICTION: Approved for public release; distribution is unlimited.*This publication supersedes FM 5-424, 25 June 1997.i

ContentsRuler and Measuring Tape . 2-3Wire Grip and Splicing Clamp . 2-4Extension Light. 2-4Thin-Wall Conduit Impinger . 2-4Wire Code Markers . 2-4Meters and Test Lamps . 2-4Section II - Wiring Materials . 2-5Electrical Conductors . 2-5Electrical Boxes. 2-7Cable And Wire Connectors . 2-9Straps and Staples . 2-9Receptacles . 2-10Surface Metal Raceways . 2-10Plugs and Cord Connectors . 2-10Switches and Covers . 2-11Fuses and Fuse Boxes . 2-12Circuit Breakers. 2-12Lamp Holders and Sockets . 2-13Signal Equipment . 2-13Reflectors and Shades . 2-13Incandescent Lamps . 2-14Fluorescent Lamps. 2-14Glow Lamps . 2-14Transformers . 2-14Pole-Line Hardware . 2-15PART TWOChapter 3WIRING PROCEDURESDESIGN AND LAYOUT . 3-1Section I - Interior Wiring . 3-1Types of Distribution . 3-1Load Per Outlet . 3-2Circuiting the Load . 3-3Balancing the Power Load on a Circuit . 3-5Load Per Building . 3-6Balancing the Power Load of a Building . 3-6Wire Size . 3-7Grounding And Bonding . 3-7Wiring For Hazardous Locations. 3-9Installation in Hazardous Locations . 3-10Installation of Signal Equipment. 3-10Battery Operation . 3-10Transformer Operation . 3-11Special Switches . 3-11Additions to Existing Wiring . 3-13Circuit Diagrams. 3-14Section II - Expedient Wiring . 3-14Purpose . 3-14iiTM 3-34.46/MCRP 3-17.7K3 May 2013

ContentsWire . 3-14Supports . 3-16Chapter 4CABLE WIRING . 4-1Section I - Armored Cable Wiring . 4-1Advantages and Uses . 4-1Materials . 4-1Installation . 4-2Additions to Existing Wiring . 4-5Section II - Nonmetallic-Sheathed Cable Wiring . 4-6Advantages and Uses . 4-6Materials . 4-6Installation . 4-7Additions to Existing Wiring Circuiting . 4-10Section III - Cable Fishing With Access . 4-10Section IV - Cable Routing Without Access . 4-11Routing Behind a Baseboard . 4-11Adding a Light and A Switch . 4-12Routing Cable Along a Wall . 4-12Routing Cable Around a Doorway . 4-12Routing Cable Through Back-To-Back Devices . 4-12Section V - Finishing Up . 4-12Mounting Boxes . 4-12Wiring Into the Power Source . 4-14Chapter 5CONDUIT WIRING . 5-1Section I - Rigid Conduit . 5-1Uses and Advantages . 5-1Materials . 5-1Procedures . 5-3Circuiting . 5-7Additions to Existing Wiring . 5-8Section II - Thin-Wall Conduit. 5-8Uses and Advantages . 5-8Bends. 5-10Installation . 5-11Section III - Flexible Conduit . 5-11Materials . 5-11Installation . 5-11Section IV - Nonmetallic Conduit . 5-12Uses. 5-12Wiring. 5-12Trimming . 5-12Bending. 5-13Joining . 5-13Chapter 6FOREIGN SYSTEMS . 6-1Section I - Wiring Installations . 6-13 May 2013TM 3-34.46/MCRP 3-17.7Kiii

ContentsType of Wiring . 6-1Voltages . 6-1Frequency . 6-1Materials . 6-2Section II - Additions to Existing Installations . 6-2Procedures . 6-2Supply . 6-2Modifications . 6-2Effects of Voltage Differences. 6-2Effects of Frequency Differences . 6-3Effects of Material Differences . 6-3Chapter 7SWITCHES AND FUSES . 7-1Disconnects. 7-1Oil Circuit Breakers . 7-4Oil Fuse Cutouts . 7-5Circuit-Reclosing Fuse Cutouts . 7-5PART THREE POWER GENERATIONChapter 8GENERATORS . 8-1Section I - Mobile Generator Sets and Electric Distribution Systems . 8-1Mobile Generator Sets . 8-1Electric Distribution Systems . 8-6Section II - Generator Selection and Operation Principles . 8-9Selecting the Generator . 8-9Computing the Load . 8-9Computing the Cable Size . 8-13Balancing the Load . 8-19Selecting The Generator . 8-22Paralleling the Generator Sets . 8-26Determining the Grounding System . 8-28Selecting the Generator Site . 8-31Constructing a Revetment . 8-32Chapter 9CONTROLS AND INSTRUMENTS . 9-1Engine Controls. 9-1Safety Controls. 9-1Engine Instruments . 9-5AC Generator Controls . 9-5AC Generator Meters . 9-5Convenience Outlet. 9-6Chapter 10SETUP, INSTALLATION, AND OPERATION PROCEDURES . 10-1Section I - Setup and Installation . 10-1Preliminary Instructions . 10-1Connection Instructions . 10-5Section II - Operation . 10-9Weather Conditions. 10-9ivTM 3-34.46/MCRP 3-17.7K3 May 2013

ContentsGeographical Areas .

TM 3-34.46 (FM 5-424/25 June 1997)/MCRP 3-17.7K THEATER OF OPERATIONS ELECTRICAL SYSTEMS May 2013 DISTRIBUTION RESTRICTION: Approved for public release; distribution is unlimited. Publication of TM 3-34.46, 3 May 2013 supersedes FM 5-424, Theater of Operations Electrical Systems, 25 June 1997.This special conversion to the TM publishing medium/nomenclature has been

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