The big problems are the "layers of civilization" in a building. It's the same as old minefields - undocumented, forgotten, ready to blow up. Companies will pay and pay and pay a little at a time and endure the high hidden costs of downtime and problems trying to duct tape the existing wiring, rather than just pay one big bill, gut it out right and do over clean & documented.
And I agree with Mr. Fox too. Why not just send in a 5-wire service?
I didn't see mention of the classic, when you have a noise issue, drill a hole in the concrete floor, pound in a stake and attach a ground wire and it will get all better. And other old wives tales... Matt
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