Contents - hdbk10920051

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

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