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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Volgage porve caution
I own a "Circuit Alert" made by GB Instruments. (had it for over 6 years,
has new batteries). These are the probes that you place in the vicinity of a live circuit and the instrument 'chirps' in response. I just discovered that it does not detect current, or voltage, when you wave it around a 240 volt cable. While it 'chirps' happily within 3-4 inches of a 120 volt wire or cable, it will not do so for 240 volts. Won't detect my main house service (6 gauge, bundled in sheathing), air conditioning feed (10 gauge, bundled in sheathing) or any other 240 volt bundled source. Of course, if you go to the end of the feed and wave the tool near either of the 120 volt legs, it shows positive. I'm doing a lot of demolition work around the house and am quite surprised by the above results. I suppose one leg of the 240 feed is out of phase with the other and they cancel each other? Any comments. Be careful our there. Ivan Vegvary |
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