66 Engineering and configuration guidelines
The following must also be-observed to implement the single-point ground:
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All ground conductors must conform to local codes and terminate in a
manner that is permanent, resulting in low impedance connections.
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All terminations should be accessible for inspection and maintenance.
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All grounding conductors must be continuous with no splices or junctions
and tagged “WARNING
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Ground Connection
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Do not remove or
disconnect.”
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Conductors should be insulated against contact with foreign grounds.
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Grounding conductors must be no-load, non-current carrying cables under
normal operating conditions.
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The use of building steel as part of the ground system is not recommended.
The DC resistance of the system ground reference wire from the I to the
building ground should be as close to zero as possible with the maximum total
resistance on all runs, within the building, not to exceed 0.5 ohms. The
‘.
insulated grounding wire size shall conform to the National Electric Code
(NEC) 250-294,250-295 and sections 310-316 (equivalent CSA requirements
when used in Canada).
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Power engineering 553-3001-l 52
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