250.50

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bassphisher

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My question has to do with the beat to death subject of concrete encased electrode.I am going to do a footing inspection this afternoon for a single family attached dwelling.This is the same thing as a duplex but they are separately owned.
Do I have the footing contractor leave a piece of rebar exposed in each property?The footing will be continuous through the entire structure.They will be separately metered.My concern is creating a path for current flowing through the rebar in the footing.My instinct is to have them stub out a rebar for each side.Just like the water,they will each have their own water service.It seems like we are grounding to a lot of things and it seems like we are creating circulating currents.
Paul
Gretna Electrical Inspector
 
Re: 250.50

If its one foundation one #4 soild copper wire 20' in lenght would do, just make sure the concrete is in direct contact with earth, and not sitting on a vapor barrier, and steel is not coated that it nullifies the conductivity.
 
Re: 250.50

If its one foundation one #4 soild copper wire 20' in lenght would do, just make sure the concrete is in direct contact with earth, and not sitting on a vapor barrier, and steel is not coated that it nullifies the conductivity.
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Yes it is just one foundation.But their are going to be two panels and two meters.Two complete seperate services.
How is this any different than a city wide metal water pipe system?
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Your right that's what I was trying to say in my original post.Thats why I think that their should be two points of attachment to the electrode.One going to each panel.
 
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