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NAVFAC MIL-HDBK-1004/6 Lightning Protection

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LIGHTNING PROTECTIONCONTENTSPageSection 1CODES AND POLICIES1.1 Scope . . . . . . . . . . . . . . . . . . . . . . . .11.2 Cancellation . . . . . . . . . . . . . . . . . . . .11.3 Policies . . . . . . . . . . . . . . . . . . . . . .11.3. <strong>Lightning</strong> <strong>Protection</strong> . . . . . . . . . . . . . . . .11.3.2 Local Codes . . . . . . . . . . . . . . . . . . . . .11.3.3 National Codes . . . . . . . . . . . . . . . . . . .1Section 2SYSTEMS2.1 Types . . . . . . . . . . . . . . . . . . . . . . . .22.1.1 Primary . . . . . . . . . . . . . . . . . . . . . . .22.1.2 Secondary . . . . . . . . . . . . . . . . . . . . . .22.1.3 Combination . . . . . . . . . . . . . . . . . . . . .22.2 Primary Systems . . . . . . . . . . . . . . . . . . .22.2.1 <strong>Lightning</strong> Masts . . . . . . . . . . . . . . . . . . .22.2.2 Grounded Aerial Conductors . . . . . . . . . . . . .22.3 Secondary Systems . . . . . . . . . . . . . . . . . .22.3.1 Air Terminals . . . . . . . . . . . . . . . . . . . .2Section 3SYSTEM COMPONENTS3.1 Masts . . . . . . . . . . . . . . . . . . . . . . . .103.1.1 Material . . . . . . . . . . . . . . . . . . . . . .103.1.2 Top Point . . . . . . . . . . . . . . . . . . . . . .103.1.3 Height and Location . . . . . . . . . . . . . . . . .103.1.4 Zone of <strong>Protection</strong> . . . . . . . . . . . . . . . . .103.1.5 Joint Design . . . . . . . . . . . . . . . . . . . .103.1.6 Joint Test . . . . . . . . . . . . . . . . . . . . .113.1.7 Metal Mast Foundation . . . . . . . . . . . . . . . .113.2 Grounded Aerial Conductors . . . . . . . . . . . . .113.3 Earthed Energy Dissipation Systems . . . . . . . . .113.3.1 Electrodes . . . . . . . . . . . . . . . . . . . . .113.3.2 Ground Counterpoise . . . . . . . . . . . . . . . . .113.3.3 Radials . . . . . . . . . . . . . . . . . . . . . . .113.3.4 Plates . . . . . . . . . . . . . . . . . . . . . . .12Section 4INSTALLATION4.1 General . . . . . . . . . . . . . . . . . . . . . . .134.2 Design Calculations . . . . . . . . . . . . . . . . .134.2.1 Earth Resistance . . . . . . . . . . . . . . . . . .134.2.2 Soil Resistivity . . . . . . . . . . . . . . . . . .134.3 <strong>NAVFAC</strong> Design Guides . . . . . . . . . . . . . . . .134.4 Ordnance Facilities . . . . . . . . . . . . . . . . .134.4.1 Storage and Handling Facilities Above Ground . . . .134.4.2 Earth-Covered Magazines . . . . . . . . . . . . . . .134.4.3 Cranes on Piers and Wharves . . . . . . . . . . . . .134.4.4 Marshalling Yards (Truck and Railroad) . . . . . . .144.4.5 Railroad Sidings . . . . . . . . . . . . . . . . . .144.4.6 Electric Service . . . . . . . . . . . . . . . . . .14

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