the problems I've seen with multiple grounds is in a home where a second
electrical grounding rod was added as part of a room addition.  A large
gauge wire was run between the two grounding rods.  As described in the
Circuit Cellar magazine article, even a large gauge wire can have a voltage
drop on it when hit with millions of volts via a lightning strike.  The
article also mentions the inductive effect of lightning on the wiring in a
house.  And, I forgot to mention that the lightning counter circuit
described in the article has a PIC in it!!!

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Micro Eng
Sent: Thursday, August 28, 2003 7:08 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE:] Relocating house earth ground


Most homes have dual grounds....one tied on the incoming copper water pipe
BEFORE the prv, and another safety ground tied to the ground rod.

>

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