Re: wiring oddities
When they were remodeling our office building we were housed in a set of trailers with power, ethernet etc. This left a spare set of offices for people to move into progressively as the building was remodeled. When the remodeling was done we moved back into our new offices.
Everything seemed to work except the image on the CRT displays in the trailers were vibrating at about 5 cycles per second. Clearly a magnetic field somewhere. After much trouble shooting with a coil of wire we discovered that someone had switched the neutral and ground on one of the fluorescent lights and there was a 4 ampere current flowing between the neutral and ground between the building and the trailers.
Now that we have flat displays there would be no problem except for a safety hazard.
Biting the hand that feeds IT
