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DOE-HDBK-1092-98
2) When the enclosure contains more than one bay, bond all grounding or bonding busses together.
3) All mounted chassis within rack cabinets shall have a grounding or bonding conductor attached
to the common grounding or bonding bus when the chassis is not grounded or bonded through
the power cord.
4) The grounding or bonding conductor shall be permanent and continuous.
5) Subassemblies mounted in other types of enclosures should be bonded by adequate preparation
of the mounting surfaces or by the use of a bonding conductor.
6) To provide protection against grounding or bonding conductor breakage, conductors between the
common grounding or bonding bus and moveable chassis should be braided cable or stranded
wire.
All grounding or bonding points should be tight for good continuity, identified by green color,
permanently labeled, and properly prepared by cleaning metal surfaces to bare metal or by the use
of serrated bushings. Anodized aluminum must be cleaned to bare metal.
The resistance across the bonding point should not be more than 0.1 ohm. If a measurement is
required, the method of measurement is to be determined by the user. (See ANSI/ISA - S82.01 - 1988
- Section 9.5.2)
9.3.4 SPECIAL CONSIDERATIONS
Systems feeding power isolation transformers must continue the equipment grounding conductor to
the equipment or the ungrounded equipment must be guarded and labeled.
For two-wire cord connected equipment, an equipment grounding connector should be installed
according to the manufacturer's instructions.
9.4 RACK POWER DISTRIBUTION
The following guidelines will provide the necessary information to correctly install power distribution
equipment within instrumentation racks containing electrical and electronic equipment.
9.4.1 GENERAL REQUIREMENTS APPLYING TO ALL AC POWER
EQUIPMENT WITHIN OR ATTACHED TO INSTRUMENT RACKS
9.4.1.1 LOADS
Knowledge of the loads that will be connected within a rack cabinet is necessary before starting
design of a rack power distribution system. All components must be sized correctly for the loads and
should provide for expansion.
Equipment enclosures may or may not contain a power distribution unit. A rack power distribution
unit contains a main overcurrent protection device and multiple branch circuits that are individually
protected against overcurrent. Without a power distribution unit, the power wiring is considered part
of one branch circuit.
9-6


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