[TowerTalk] GROUNDING OF FIELD DAY STATIONS

[Jim & Velma Woods]

Regarding this topic, I believe that the NEC requires that portable generators have the neutral grounded when the power level is 5000 watts or higher.  This would explain why many generators do not have this provision.

Also, I believe that GFCI's could be effectively used ... even if the neutral is grounded.  They don't "measure" leakage through the grounded conductor but sample the degree of balance between the neutral and hot conductors.  If the imbalance is greater than about 5 mA, they trip.  The assumption is that the imbalance is current flowing via the grounded conductor.

I recommend that GFCI's be used on all 120 volt circuits that are in "wet locations" which includes outdoor circuitry.  Although in the US OSHA rules only apply to employer-employee sites (work settings like construction sites) use of GFCI's is considered "good electrical safety practice".

Jim Woods, W7PUP
(Retired Safety Engineer)
Grants Pass, OR
woods at grantspass.com