i work for a cable company and we have this phenomenom called voltage feedback. it breaks down into two parts. first part is we read an AC voltage between the coax and house ground, which we say is "floating voltage". second part is where we grab the coax and touch the ground and get a "tingle". sometimes we can attribute the tingle to a bad electrical plug, bad t.v., etc. but sometimes, none of these apply and we are baffled. any more knowledge would be extremely heplful.

retsoksirhc

Probably of no use to this discussion, but interesting nonetheless:

We had voltage come back from Sattelite receivers that, for some reason or another, customers would connect to cable outlets after the initial installation. I just don't understand what people are thinking sometimes...

KeepItSimpleStupid

You know that there are systems out there which use 2 grounds and use green and green with yellow stripe.

Green is protective ground
Green with yellow is signal ground.

And they tend to keep them separate.

Motors would use protective ground.
The other receptacles would be the orange independent ground and connected to signal ground.

buzzman

This is called an "Isolated ground system". The different color wires are used to differentiate the two grounding sytems. It is a separate path of ground isolated from the main grid, that goes to the same grid, if that makes sense...lol. in other words, it will have its own "strict path to ground" that will not be tied in parallel with any other operating system ground. It is used to take away "circulating currents" in Electronic wiring that is often installed close to or around other sources of energy. These circulating currents can cause variations (Misreadings) in electonic devices when accuracy is of upmost importance. ie: Instrumentation in an airplane, gas plant,...etc...