Figure 9-2 - hdbk109220040146

DOE-HDBK-1092-2004

RACK #1

RACK #2

Cabinet rails

used for

AC power strip.

bonding.

Bonding Conductor

These chassis shall be

bonded/grounded internally

Identified equipment

from the ground wire in cord.

ground points.

Bonding

Conductor

These chassis shall be

Identified

bonded/grounded

equipment ground

internally from the ground

points.

wire in cord.

Required ground or bonding

Required

wire common to the ground

bonding/grounding

wire of the power strip and the

(Same gauge or

ground wire of the ac power

"Rack #1" supplying

larger than ac power

cable coming into this second

single phase, ac power

cable.)

rack (Same gauge or larger

to "Rack #2).

than the ac power cable.)

NOTE: This drawing represents a typical

Typical configuration for

120/208 Volt, three phase Wye, 5

Metallic case of typical power strip is

bonding/grounding wire

wire, ac power for Rack #1.

bonded to the grounding conductor

going to cabinet rail

through means of mounting screw.

Energized conductor - Black

(Hot, AC source)

Grounded conductor - White

Compression

(Neutral, AC return)

fitting (not

Grommet

Green

Equipment grounding conductor

"NM" type)

Green, Green with Yellow stripe,

Bare (Ground)

The Equipment Grounding Conductor

Black

and the Grounded Conductor shall

White

Typical Single-Phase, AC plug

for power to Rack #2

NOT be connected together at power

Incoming ac power

(Typically, 120 V,

cable termination.

Single Phase)

Figure 9-2

1) Have a common grounding or bonding bus (normally a cabinet rail).

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.

9-4