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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Testing for DC presence on AC mains posted by madisonears on January 12, 2007 at 17:46:17:
Set your voltmeter, of whatever type, to DC volts; lowest range.Put the positive probe on the neutral (large slot) of the outlet, and the negative probe in the safety/earth slot (the roundish one in the middle). Take your measurement.
If you are in a normal residential situation, there will be no (or less than a volt) difference. Where this comes into play is in large-scale (like apartment buildings) predicaments where there is a long path between neutral and earth ground, back at the supply. It's always prudent to test, though. At my single cottage, there's not a millivolt's difference.
Live long and prosper,
Poinz
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Follow Ups
- Yes. - Poindexter 18:43:32 01/12/07 (1)
- No - djk 00:09:12 01/13/07 (0)
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