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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => AC Power and Grounding => Topic started by: Phil Graham on December 17, 2013, 01:22:41 PM
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This 19min video is an interesting look at problems (e.g. fires) caused by open neutrals, courtesy of Mike Holt, whose site is an excellent resource for all things electricity:
http://www.youtube.com/watch?v=XZ_zzHpGBGw
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This 19min video is an interesting look at problems (e.g. fires) caused by open neutrals, courtesy of Mike Holt, whose site is an excellent resource for all things electricity:
http://www.youtube.com/watch?v=XZ_zzHpGBGw
I've personally measured 5 volts AC between one side of a manufacturing plant and the other side several hundred feet away. We had a hint that something was wrong when we connected a CCTV camera back on the rail dock and ran a piece of coax several hundred feet to the guard shack. We had huge hum bars on the video and the coax felt warm to the touch. Our fix was video isolation baluns in the coax lines, but I'm sure there were all sorts of neutral currents running around the I-beams of the building.
The video above is fascinating in that it shows how a low-voltage/high-amperage arc can cause a fire inside a wood wall. Scary stuff when you think about it.
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maybe thats why i have seen arcs and felt tingles sometimes when adding electrical to an existing building. here in california the dirt is always shaking.