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Page 48 of 332 Chapter 3 — System and site requirements
553-3021-209 Standard 3.00 April 2000
The following are additional grounding requirements:
• Ground conductors for the Option 11C Mini system:
— must not be smaller than #6 AWG (#40 metric) at any point (see
Table 10 on page 49. This table provides a list of grounding wire
requirements specific to some areas)
— must be routed through the same conduit as the phase conductors
that serve the system
— must not be smaller than any phase conductor in the same conduit
— do not carry current under normal operating conditions
• All ground conductors in the building:
— must be isolated from the neutral bus except at the service entrance
to the building
— must be hardwired to the main ground reference
• Avoid spliced conductors. Continuous conductors have lower
impedance, and they are more reliable than spliced conductors.
CAUTION
Never connect the single point ground conductor from the Option 11C
Mini system to structural steel members or electrical conduit. Never
tie this conductor to a ground source or grounded electrode that is not
hard-wired to the building reference conductor.