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DOE-HDBK-1092-98
CONTENTS
4.0
GROUNDING ....................................................................................................... 4-1
4.1
REGULATIONS, CODES, AND REFERENCES ....................................... 4-1
4.1.1
ENGINEERING SPECIFICATIONS AND DRAWINGS ................ 4-2
4.2
CIRCUIT AND SYSTEM GROUNDING ..................................................... 4-2
4.3
EQUIPMENT GROUNDING ....................................................................... 4-2
4.4
BONDING .................................................................................................. 4-3
4.5
GROUNDED OR UNGROUNDED SYSTEMS .......................................... 4-4
4.5.1
GROUNDED SYSTEMS ............................................................... 4-4
4.5.2
UNGROUNDED SYSTEMS .......................................................... 4-5
4.5.3
HIGH-IMPEDANCE GROUNDING ............................................... 4-6
4.6
GROUNDING REQUIREMENTS ............................................................... 4-7
4.7
GROUNDING ELECTRODE CONDUCTOR (GEC) .................................. 4-9
4.7.1
SIZING THE GROUNDING ELECTRODE CONDUCTOR ........... 4-9
4.7.2
EXCEPTION TO NEC 250-94 ..................................................... 4-10
4.8
MAIN BONDING JUMPER ...................................................................... 4-10
4.9
SYSTEM WITH GROUNDED CONDUCTOR .......................................... 4-11
4.10 EQUIPMENT GROUNDING CONDUCTOR ............................................ 4-14
4.10.1 SIZING THE EQUIPMENT GROUNDING CONDUCTOR .......... 4-14
4.10.2 SEPERATE EQUIPMENT
GROUNDING CONDUCTORS ................................................... 4-15
4.11 UNGROUNDED SYSTEMS ..................................................................... 4-15
4.12 GROUNDING A SEPARATELY DERIVED SYSTEM ............................. 4-15
4.13 GROUNDING ELECTRODE SYSTEM .................................................... 4-16
4.14 GROUND-FAULT PROTECTION OF EQUIPMENT ............................... 4-17
4.15 PERSONNEL PROTECTIVE GROUNDS ............................................... 4-17
4.15.1 PURPOSE OF PERSONNEL PROTECTIVE GROUNDS .......... 4-18
4.15.2 CRITERIA FOR PERSONNEL PROTECTIVE GROUNDS ........ 4-18
4--i
41


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