grd rod

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It was more like lack of theory or understanding or the definition of a grounded and grounding conductor.

Was allowed years ago but no longer for new installs.

As for existing sub-panel, yes keep ground bar/neutral bar tied together.
 
grd rod

mopowr steve said:
It was more like lack of theory or understanding or the definition of a grounded and grounding conductor.

Was allowed years ago but no longer for new installs.

As for existing sub-panel, yes keep ground bar/neutral bar tied together.
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so on existing sub panels with a three wire feed, driving a ground rod and keeping the neutral bar and grd bar connected will be safe and better than not having the grd rod there at sub panel at all?
 
enireh said:
so on existing sub panels with a three wire feed, driving a ground rod and keeping the neutral bar and grd bar connected will be safe and better than not having the grd rod there at sub panel at all?
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We drive ground rods because we have always driven ground rods and that is the reason we will keep driving ground rods. I don't think there is a huge gain in safety having them.

What is most important is to keep a low impedance equipment ground path back to the breaker so that it will trip on a ground fault. That usually means keeping the neutral bonded at the sub panel for an existing three wire feed. We are talking about a sub panel in a separate structure, right?
 
ActionDave said:
We drive ground rods because we have always driven ground rods and that is the reason we will keep driving ground rods. I don't think there is a huge gain in safety having them.

What is most important is to keep a low impedance equipment ground path back to the breaker so that it will trip on a ground fault. That usually means keeping the neutral bonded at the sub panel for an existing three wire feed. We are talking about a sub panel in a separate structure, right?
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yes a separate structure farm land with sub panels 150' out from the source I work a lot of farm/ranch lands and the three wire system feeding sub panels is always the case so the best one can do is drive a ground rod a lot of these are very old systems and the folks owning the property don't want to spend much and there thoughts are "well its been this way all along and its fine" so I talk them into grd rods and some will read the links explaining why a grd rod is a good idea if we cannot get the grd wire in from the source

thank you so much
 
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