MIL-STD-1310H(NAVY) APPENDIX C
ASTM INTERNATIONAL
ASTM B152/B152M - Standard Specification for Copper Sheet, Strip, Plate, and Rolled Bar
(Copies of this document are available from ASTM International, 100 Barr Harbor Dr., PO Box C700, West
Conshohocken, PA 19428-2959 or online at www.astm.org.)
NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) National Electrical Code Handbook
(Copies of this document are available from NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471 or online at www.nfpa.org.)
C.2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
C.3 GROUND SYSTEM CABLES
The cables used in the ground cable installation shall be in accordance with MIL-DTL-24643, and shall have a minimum conductor size as specified herein.
C.3.1 Ground cable installation. Ground cables shall be of minimum lengths consistent with other requirements specified herein. Cables shall be installed in locations that provide minimum exposure to physical damage, and shall provide access for inspection, repair, or replacement. Cables installed on nonmetallic hull structures shall be supported by fasteners. Ground lugs installed on cables shall be copper and shall be connected by brazing. Lugs shall not be crimped to the extent that conductor diameter is affected.
C.3.2 Ground plate interconnecting cable. A number 650 million circular mils (MCM) cable shall be installed from each ground plate to the main ground connection point.
C.3.3 Main ground cable. Number 0000 AWG cables shall be used as main ground cables for grounding all electrical and electronic equipment and metallic items. These cables shall be connected to the main ground connection point and shall run throughout the ship as shown on figure C-1.
C.3.4 Branch ground cables. Branch ground cables shall be number 10 AWG and shall be used to connect equipment requiring grounding (see C.1.3) to main ground cables.
a. Branch ground cables shall be attached to the main ground cable by brazing or by connectors.
b. A separate ground conductor in a power supply cable may be used in lieu of a separate ground wire connecting electrical or electronic equipment to associated connection boxes and switch boxes.
(1) Ground conductor shall connect to the generator or distribution panel and to metal housings of each component within the electrical supply system.
(2) The generator or distribution panel shall then be connected to the ground plates.
c. Ground loops shall be avoided where multiple ground conductors or cable shields terminate to equipment housings.
d. The power cable method of grounding shall follow the safety grounding requirements of the NFPA National Electrical Code Handbook.
e. Class B bonding to metallic decks, bulkheads, or masts may be used in lieu of a branch ground wire.
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