GEC 700.7(B)

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Greg1707

Senior Member
Location
Alexandria, VA
Occupation
Business owner Electrical contractor
WARNING
SHOCK HAZARD EXISTS
IF GROUNDING
ELECTRODE CONDUCTOR OR
BONDING JUMPER
CONNECTION IN THIS
EQUIPMENT IS REMOVED
WHILE ALTERNATE SOURCES
ARE ENERGIZED.

I don't understand the shock hazard if the GEC is disconnected. I thought the grounding electrode system was unrelated to over current or short circuit etc.
 
T

texie

Senior Member
Location
Fort Collins, Colorado
Occupation
Electrician, Contractor, Inspector
Greg1707 said:
WARNING
SHOCK HAZARD EXISTS
IF GROUNDING
ELECTRODE CONDUCTOR OR
BONDING JUMPER
CONNECTION IN THIS
EQUIPMENT IS REMOVED
WHILE ALTERNATE SOURCES
ARE ENERGIZED.

I don't understand the shock hazard if the GEC is disconnected. I thought the grounding electrode system was unrelated to over current or short circuit etc.
Click to expand...

This is only required if the generator is installed as a non separately derived system in which case the normal system main bonding jumper and grounding electrode system also serve as the main bonding jumper and GES for the generator. If you were to interrupt this while running on the generator you would lose your GES and main bonding jumper.
This would not be an issue if the alternate source was set up as a SDS as it would then have its own GES and main bonding jumper.
 
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