Posted by Fromjb2 on September 17, 2007 at 13:00:28 from (74.111.119.222):
In Reply to: Electrical Grounding posted by John T on September 17, 2007 at 08:17:17:
Hi John T, excellent article. Many years ago, I worked in a computer facility where a new isolation transformer had been installed and the Electrician was connecting up the new power feeds to the mainframe. The Electrician had all the breakers in the main panel turned off and he was connecting the wire ends in the main breaker box of the mainframe when all of a sudden there was a flash like an arc welder from where the Electrician was working. Every one rushed over to see if he was OK, he just held up his hand with a screwdriver with part of the tip and a V notch in the shaft that had been burned away. He had connected the ground lug to the case of the breaker panel and was in the process of connecting the neutral when his screw driver slipped and made contact between the neutral and grounded case. Electrician was really puzzled, he took out his VOM meter and measured between neutral and ground and there was 10VAC. After further investigation it was determined the contractor that installed the isolation transformer had never connected the neutral to the building ground point (city water pipe). Moral of the story, always check the neutral to ground voltage with a VOM meter because serious damage or injury can occur because there are no circuit breakers on the neutral wire.
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