Failed Inspection

[LarryFine]

I would think the metal enclosure of a panel would be at least as good a conductor as any of those.

But then, it's not just the metal, it's also (at least) two threaded-hole connections to it.

 

[wwhitney]

But then, it's not just the metal, it's also (at least) two threaded-hole connections to it.

OK, but as long as each of those connections complies with 250.8(A), that's not a violation.

Cheers, Wayne

 

[LarryFine]

OK, but as long as each of those connections complies with 250.8(A), that's not a violation.

Perhaps it's an acknowledgement (admission?) that some "normal" neutral current flows in electrodes.

I'm just guessing here. You'd need to ask whomever came up with the rule.

 

[kwired]

That voltage rise is still there in those locations, but you have simply raised the voltage of all conductive items within reach to that same voltage. A measurement to remote earth from those bonded locations will show the voltage rise.

I was aware of that.

This is a major contributor to electrocutions at boat docks and similar areas. Hard to make EPB in a lake.

 

[kwired]

A few years back one of our guys was doing a resi panel swap and due to the length of the old wire the (existing) water bond ended up on the factory installed equipment grounding bar but the ground rods and neutral were on the neutral bar, and the inspector rejected it.
I am pretty sure he let me jump a piece of bare #4 between the bars, as then they are joined but something other than the MBJ screw. They really prefer it to be all on the neutral bar, which is easy in new work.
They also don't like the bare from old 3-wire SE range and dryer cables landed on the equipment ground bar, even if the service becomes a sub panel.

If it is supplying a 120/240 load and was originally allowed to bond the appliance to the grounded conductor then it technically is a grounded conductor and should not land on the EGC bus.

In a sub panel it isn't allowed and sort of never really was allowed though you can see it often on old installations around here.

 

[LarryFine]

In a sub panel it isn't allowed and sort of never really was allowed though you can see it often on old installations around here.

Or in a panel that became a sub-panel and the 3-wire appliance feed was overlooked/ignored.