Grounding a pool

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atomjock

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Here is an interesting pool grounding/bonding issue:
I have a pool that will abut a mixed construction house with poured in-place concrete walls for the basement and I-beams as key structural load bearing members throughout the house. The structural steel is all bonded together and a #3/0 grounding electrode conductor runs from one of the I-beams to the grounding buss in the main service panel. The house has a pool that abuts one of the basement structural walls. The pool enclosure is made up of the structural wall of the house and (3) poured-in-place retaining walls whose rebar is driven into the bedrock of the land. The rebar of the retainign walls is bonded to the rebar of the structural walls of the house. There will be a window in the basement wall allowing you to see in the pool. The pool itself will be sprayed into the enclosure formed by the structural wall and the (3) retaining walls. The decking of the pool is actually a wide, poured-in-place veranda that sits on metal pans that lie on the structural steel beams; the walkway is part of the house.
My question is this:
If i instruct the pool contractor to bond the wire grid for the sprayed-in pool to the structural steel i-beam that supports the veranda, will this provide the equipotential grounding required by 680? My concern is that the structural steel is already part of the grounding electrode system.

your input is most welcome.

thanks!
 
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The fact that the structural steel is already part of the grounding electrode system is of no concern. All the metal in the area of a pool must be bonded together including luminaires and pump motors which already have an EGC. The EGC leads back to the service where the grounding electrode conductor originates. It may not be necessary to bond the grid to the structural metal unless it is part of the reinforcing steel for the pool. I say it's unnecessary because there is already a low resistance path to the grounding electrode.
 
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