grond rod

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mdh

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This may be a stupid question but here go
I am doing a private boat dock not a floating type,running a 240 volt 60 amp 4 wire feeder installed in sch 80 pvc terminating at the sub pnl in a storage room 100 feet out into the water.All is gfci protected.the water is down at this time and MY QUESTION should i install a 8 foot ground rod and wire at the sub pnl while the water is down or would the equipment ground conductor with the feeder be sufficient?

thanks MDH
 
Re: grond rod

Unfortunately, it appears you will have to comply with 250.32(A) and install a grounding electrode system for the panelboard at the dock.

Now the real question is where to put it. I would assume that it would perhaps be better to run the GEC back to the property and ground into the earth. Otherwise, you are going to have significant corrosion issues installing the system underwater...

I am curious to see what others suggest.
 
Re: grond rod

no scuba needed at this time because the water is down in the winter but TVA raises the water in the spring, so may-be the inspector may give some advice,BTW there is a 60 amp gfci disconect at the shore line with a ground conductor and 8 ft rod
Thanks and all comments would be appreciated

MDH
 
Re: grond rod

mdh,
a 4-wire EGC grounded panel GFCI protected BC's with an isolated neutral terminal bus is suffice when connected from the main disconnect panel that has 2 ground electrodes or provide 25 ohm or less for one rod test verification to the AHJ. [250.54]electrodes, [250.56]resistance, [250.32(A)]Single multi-wire exception, [250.130(B)]ungrounded system. Electrode grounding references.
rbj, Seattle

[ January 09, 2006, 06:19 AM: Message edited by: gndrod ]
 
Re: grond rod

rbj,
The original poster says that this is a feeder and not a branch circuit, so the exception to 250.32(A) does not apply.
Don
 
Re: grond rod

Sorry about that. I threw that in for associated reference. :eek: I can see where that would be misleading. tx don.
 
Re: grond rod

Hey I think I will drive a 8 ft rod and cadweld a #4 solid to the rod.It will take many plenty years before corrosion eates the solid wire in two.

what do you all think?

MDH
 
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