Contents cont'd - hdbk109220040013

DOE-HDBK-1092-2004

8.3.2

CONDITIONS OF USE ....................................................................................................8-6

8.3.3

USE OF EXTENSION CORDS........................................................................................8-6

8.3.4

DOUBLE INSULATED TOOLS........................................................................................8-6

9.0

ENCLOSED ELECTRICAL/ELECTRONIC EQUIPMENT ............................................................9-1

9.1

PURPOSE..................................................................................................................................9-1

9.2

SCOPE.......................................................................................................................................9-1

9.3

GROUNDING AND BONDING ..................................................................................................9-1

9.3.1

OBJECTIONAL CURRENT OVER GROUNDING CONDUCTORS................................9-1

9.3.2

EQUIPMENT GROUNDING CONDUCTOR....................................................................9-2

9.3.3

ENCLOSURE GROUNDING AND BONDING.................................................................9-3

9.3.4

SPECIAL CONSIDERATIONS ........................................................................................9-5

9.4

RACK POWER DISTRIBUTION ................................................................................................9-6

9.4.1

GENERAL REQUIREMENTS APPLYING TO ALL AC POWER EQUIPMENT

WITHIN OR ATTACHED TO INSTRUMENT RACKS .....................................................9-6

9.4.1.1

LOADS.........................................................................................................................9-6

9.4.1.2

OTHER GENERAL EQUIPMENT REQUIREMENTS .................................................9-6

9.4.2

CONDUCTORS AND CABLES SPECIFIC REQUIREMENTS. ......................................9-6

9.4.2.1

FLEXIBLE CABLES.....................................................................................................9-7

9.4.2.2

STRAIN RELIEF ..........................................................................................................9-7

9.4.2.3

SEPARATION OF VOLTAGES ...................................................................................9-7

9.4.2.4

OTHER CONCERNS...................................................................................................9-8

9.4.3

POWER SWITCHES AND INTERLOCK DEVICES SPECIFIC REQUIREMENTS ........9-8

9.5

CHASSIS POWER DISTRIBUTION ..........................................................................................9-8

9.5.1

AC POWER DISTRIBUTION ...........................................................................................9-8

9.5.1.1

CHASSIS BONDING AND GROUNDING ...................................................................9-8

9.5.1.2

CONNECTIONS, CONNECTORS, AND COUPLINGS ..............................................9-9

9.5.1.3

TERMINALS/LIVE PARTS ........................................................................................9-10

9.5.2

DC POWER DISTRIBUTION.........................................................................................9-10

9.6

PROTECTIVE DEVICES FOR ENCLOSED ELECTRICAL/ ELECTRONIC EQUIPMENT.....9-10

9.6.1

SURGE ARRESTERS ...................................................................................................9-10

9.6.2

FUSES ...........................................................................................................................9-11

9.6.3

CIRCUIT BREAKERS ....................................................................................................9-11

9.6.4

POWER INTERLOCK DEVICES ...................................................................................9-11

9.7

DISCONNECTING MEANS .....................................................................................................9-11

9.7.1

GENERAL ......................................................................................................................9-12

9.7.2

EMERGENCY SHUTDOWN..........................................................................................9-12

9.7.3

SPECIAL CONSIDERATIONS ......................................................................................9-12

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