Posted by barnE on April 28, 2012 at 16:05:18 from (67.172.83.183):
In Reply to: Electrical question posted by Stephen Newell on April 27, 2012 at 19:35:30:
Used to use megger made by Biddle co. for checking ground resistance. Hand cranked dynamo created I think DC current that went through galvanometer calibrated in ohms. Megger was hooked to known positive ground and wire being checked. Current through galvanometer, reading in ohms would tell you the resistance of ground existing. Megger would also shock the heck out of you if not careful. Seems like it could read up to 1000 megohms. What you are trying to do is make sure ground or grounding is very low resistance like 20 or 40 ohms to keep equipment and personel safe. Dave (all I know from 20 years ago)
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