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Old 05-21-2010, 09:02 PM   #1
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service entrance grounding question


I've had a 200 amp service drop and weter base set on a power pole and I'm going to set a service entrance panal on the same pole next to it. Is it permissable to tape the panal ground into the sevice drop ground or is it required or safer to connect to its own deicated ground rod?

Thanks in advancefor yourhelp

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Old 05-21-2010, 09:45 PM   #2
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service entrance grounding question


What is a service drop ground?

Your panel will be grounded to any of the acceptable grounding electrodes, of which ground rods are the most common.

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Old 05-22-2010, 03:39 AM   #3
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service entrance grounding question


There is no ground in a service drop. You need two ground rods outside at the meter and a grounding electrode conductor to your water main (if you have metallic piping.) Your grounding electrode conductor will be bonded (usually with a green screw or a metal bonding strap) to your neutral bus.

I don't mean to sound rude, but it sounds like you should get an electrician. If you mess up your grounding or neutrals, it could spell big trouble down the road.
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Old 05-22-2010, 08:50 AM   #4
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service entrance grounding question


The service drop (coming from the transformer) neutral is grounded at the transformer and again at the service pole. the groundwire at that pole comes from the neutral at the top of the pole and then direct to earth atthe base of the pole. I a normal entrance at the building I would install a ground rod and bond the neutral in the panel. Since in this installation I have a ground wire at the service pole, coming from the top of the pole to earth( although it is a neutral ground). Is it permissable to use that gound wire as a entrance panel ground or must I drive a seperate ground rod for the entrance panel. I know the cost and effort are really not a factor, I just want to know the ramifacations of such an insallation.
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Old 05-22-2010, 04:06 PM   #5
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service entrance grounding question


You will not pass your electrical inspection!
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Old 05-22-2010, 07:10 PM   #6
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service entrance grounding question


If I'm picturing this correctly, you're telling us that the utility ran a ground with your service drop? The only place I've heard of this happening is the UK.
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Old 05-22-2010, 07:38 PM   #7
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service entrance grounding question


After reading this I am wondrering if the OP wants to use the ground already run by the POCO on the pole as their grounding means for the panel instead of installing their own.
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Old 05-22-2010, 08:32 PM   #8
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service entrance grounding question


Thanks for the replies everyone. My question was answered. Commen sence told me the right answer but I wanted to clearify the particulars. You did that well. Thanks again.
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Old 05-22-2010, 08:39 PM   #9
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service entrance grounding question


Even though the OP has apparently solved their problem, it bears mentioning for future readers that service grounding occurs at the point of service. The point of service is the first means of disconnect (breaker at the meter location (if present) or the main breaker in the main panel. Ground rods and grounding electrode conductors originate from that point. What the POCO does at the pole is their business, but can't be utilized by the customer in most cases.
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Old 05-23-2010, 01:53 AM   #10
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service entrance grounding question


well said

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