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Grounding specifications
Every three-phase circuit must contain three-phase conductors and an insulated
equipment-grounding conductor. Every single-phase 120 volt branch circuit (used
for the Hardware Management Console and service outlets) must contain one
phase conductor, a neutral conductor, and an insulated equipment-grounding
conductor.
For 200 VAC through 240 VAC installations worldwide, the equipment-grounding
conductor must match local electrical codes and must be green with or without one
or more yellow stripes on the insulation. IBM recommends that the ground wire be
the same size as the phase conductor wires.
Conduit must not be used as the only grounding means. However, any conduit or
cable shield must be connected at both ends in such a way that it is included in the
grounding path in parallel with the grounding conductor it contains. Most electrical
codes require that branch circuit wiring be located in metallic conduit, or be made
from shielded cable, if located under a raised floor. Even when not required by local
regulations, some form of shield around the branch circuit wiring is strongly
recommended as a means of reducing coupling of high-frequency electrical noise
into signal and control cables.
There is information about additional recommendations and requirements for
equipment grounding on IBM's Resource LinkWeb site (http://www.ibm.com/
servers/resourcelink). See "General Information for Planning a Physical Site".
46
z10 BC IMPP
Level 03c, May 2011
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