I've been asked to do a job that I think I'm going to pass up on for safety reasons. While I have a lot of electrical experience, this particular job makes me uncomfortable. In light of that, however, I had some questions arising from this experience.
The job is to install Neon tubes in a window of a pizza shop. I have to install the power unit with a dedicated 20A 120V circuit. The label on the power unit says it takes in 120v and increases it to well over 15,000 volts before sending it thru the Neon tubes. I saw that on the label and immediately decided that I felt I was in over my head. I believe it's not the volts that will kill you, but the amps, right? or worng? Because I wasn't sure....well here I am writing to inquire before I do ANYthing.
The installation instructions specify the power unit MUST have it's own ground connection not shared with anyting else. I've heard of this before in other things and now I'm wondering, what really is the purpose of an isolated ground wire? I mean, why can't you have anything else grounding to this same ground wire? Why does it have to be a "dedicated" grouind wire not shared with anything else?
I'm asking because I'd like to tap into an existing circuit nearby that has a Neon power unit, to save me the cost of running a whole new circuit. But the manufacturer says while I can do that, I MUST run a separate dedicated grouind wire to the new unit and not share the grouind between units. Why not?