Contents cont'd

DOE-HDBK-1092-2004

2.13.4.6.2

VISUAL INSPECTIONS.......................................................................................2-21

2.13.4.6.3

RATING INSTRUMENTS AND EQUIPMENT .....................................................2-21

2.13.4.6.4

CALIBRATION OF ELECTRICAL INSTRUMENTS ............................................2-21

3.0

ELECTRICAL PREVENTIVE MAINTENANCE.............................................................................3-1

3.1

DEVELOPMENT AND IMPLEMENTATION REQUIREMENTS ................................................3-1

3.2

DEFINITION ...............................................................................................................................3-1

3.3

MAINTENANCE .........................................................................................................................3-1

3.4

INSPECTION .............................................................................................................................3-1

3.5

ESSENTIAL ELEMENTS ...........................................................................................................3-3

3.6

PLANNING AND DEVELOPING AN EPM PROGRAM; FUNDAMENTALS OF EPM...............3-3

3.7

GROUND-FAULT PROTECTION ..............................................................................................3-3

4.0

GROUNDING................................................................................................................................4-1

4.1

REGULATIONS, CODES, AND REFERENCES .......................................................................4-1

4.1.1

ENGINEERING SPECIFICATIONS AND DRAWINGS ...................................................4-1

4.2

CIRCUIT AND SYSTEM GROUNDING.....................................................................................4-1

4.3

EQUIPMENT GROUNDING ......................................................................................................4-1

4.4

BONDING...................................................................................................................................4-2

4.5

GROUNDED OR UNGROUNDED SYSTEMS ..........................................................................4-3

4.5.1

GROUNDED SYSTEMS..................................................................................................4-4

4.5.2

UNGROUNDED SYSTEMS.............................................................................................4-5

4.5.3

HIGH-IMPEDANCE GROUNDING ..................................................................................4-5

4.6

GROUNDING REQUIREMENTS...............................................................................................4-6

4.7

GROUNDING ELECTRODE CONDUCTOR .............................................................................4-7

4.7.1

SIZING THE GROUNDING ELECTRODE CONDUCTOR..............................................4-8

4.7.2

EXCEPTIONS TO NEC 250.66 .......................................................................................4-8

4.8

MAIN BONDING JUMPER.........................................................................................................4-9

4.9

SYSTEM WITH GROUNDED CONDUCTOR..........................................................................4-10

4.10

EQUIPMENT GROUNDING CONDUCTOR............................................................................4-12

4.10.1

SIZING THE EQUIPMENT GROUNDING CONDUCTOR ............................................4-12

4.10.2

SEPARATE EQUIPMENT GROUNDING CONDUCTORS ...........................................4-13

4.11

UNGROUNDED SYSTEMS.....................................................................................................4-13

4.12

GROUNDING A SEPARATELY DERIVED SYSTEM..............................................................4-14

4.13

GROUNDING ELECTRODE SYSTEM ....................................................................................4-15

4.14

GROUND-FAULT PROTECTION OF EQUIPMENT ...............................................................4-16

4.15

PERSONNEL PROTECTIVE GROUNDS ...............................................................................4-16

4.15.1

PURPOSE OF PERSONNEL PROTECTIVE GROUNDS.............................................4-16

4.15.2

CRITERIA FOR PERSONNEL PROTECTIVE GROUNDS...........................................4-17