This article was posted 02/22/2008 and is most likely outdated.

Investigation and Test of Grounding Method for Electrical Installations
 

 

Topic - Interesting and Important Documents
Subject - Investigation and Test of Grounding Method for Electrical Installations

February 22, 2008
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Interesting and Important Documents

 

Investigation and Test of Grounding Method for Electrical Installations

 

ImageThis is the first in a new series we’re starting in which we’ll send you interesting and important documents from Mike Holt’s archives.

 

This paper written by H.G. Ufer in 1961 explores the need for an adequate means for grounding. One which requires very little maintenance and one which does not require connection to the water pipe systems to provide an adequate low resistance ground. The purpose of this paper was to record the development and test of such a grounding method and to suggest its further test.

 

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Comments

  • I would be more comfortable with using two grounding rods, 10-ft long, cadwelded together set on spacers and laid at the bottom elevation of the footing, but not in the footing. Dig a trench to lay the ground rods in and pour some concrete around it. This way, the concrete in the footing would not be exposed to vaporization from heat generated by the lightning strike. Cadweld a #4/0 or larger bare copper cable to the ground rod and bring up to the surface in a PVC conduit for protection. From the surface it can then be extended to the electrical service grounding bars.

    Any comments?

    Bob Martino
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