2 ground leads?

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beachbumjeremy

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I don't know if this is the right section, but I asn't sure where to post it. My brother just demod a building and one thing he pulled out was w sensor switch, the type that mounts for bathroom lights or office lighting or whatever you'd like. What caught me as strange was that it has 2 seperate ground leads. For is labeled 120 ground, and the other says 277 ground. I've asked both my teacher and my foreman and both said they'd never seen it. Since it was already installed, I couldnt read up on it. Anybody know?
 
ground leads

ground leads

beachbumjeremy said:
I don't know if this is the right section, but I asn't sure where to post it. My brother just demod a building and one thing he pulled out was w sensor switch, the type that mounts for bathroom lights or office lighting or whatever you'd like. What caught me as strange was that it has 2 seperate ground leads. For is labeled 120 ground, and the other says 277 ground. I've asked both my teacher and my foreman and both said they'd never seen it. Since it was already installed, I couldnt read up on it. Anybody know?
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It seems more likely as Ron stated, one is for grounding, the other for the grounded coductor, (white or grey) because you need the grounded conductor to operate the sensor. IMHO
 
Possible that one was for an isolated ground? If they were labelled what they were for, why the question? I would just assume that one was for 120 the other for 277. Why would they do it that way? One can only guess!
 
One of them is not the grounded conductor, they are both green. It is clearly labeled. I just don't understand why there would ever need to be a seperate ground for a 120 or 277. As Barbeer stated, who knows why they did it, but I was just hoping someone did.
 
Definately 2 grounds

Definately 2 grounds

I have connected these type switches many times. There are 2 distinct grounds, 1 @ 120v & 1@ 277v. You are instructed to cap the unused ground tail by the manufacturer. They are electronic devices and work with the hot and switch leg and have no identified grounded (neutral conductor tail). The device apparently uses the ground to connect the small amount of power to either the 120 or the 277v power supply. Why they need 2 separate grounds or how this is allowed I'm not sure, but the device is U.L. approved.
 
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