Isolated ground

[wt5y]

In my house I set up my ham shack /workbench in the garage.  I ran 6/3 awg to a subpanel.  From their I have everything in the garage ie washer dryer water heater overhead outlets motion lights flourescant strip lights 240v heater wired with thhn wire ran in 1/2 EMT.  I even made sure that the track the garage doors roll up on was bonded to the EMT.  Basically anywhere you put a meter in their its going to read .17 ohms even the metal steelcase desk is bonded. Along with the filing cabinet.  Now I got those fancy red isolated ground receptacles with the green delta triangle.  The ground screw is not connected to the mounting strap on the outlet so your ground wire is isolated except when you connect the ground wire to the ground bar in the subpanel which is connected through the EMT back to the box holding the outlet. Maybe I'm missing the point but how is different from using a regular outlet.  And yes I have the neutral bus seperate from the ground bar per NEC.  Their probably overkill but since I have them might as well use them.

John wt5y
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[Don Wilhelm-3]

John,

Think single point ground (the one at the breaker box end) - it minimizes
circulating ground currents.  Great for audio (keeps hum off the equipment
enclosures, etc.), but of no value for RF.

BTW - are you saying you are working on a bench with a conducting metal top?
If so, that is a hazard in itself for any electrical work.  Consider what
can happen if you accidently contact a high voltage while touching the desk.
That is why metallic objects (and anti-static devices) are normally grounded
through a 1 meg resistor.

73,
Don W3FPR

> -----Original Message-----
>
> In my house I set up my ham shack /workbench in the garage.  I
> ran 6/3 awg to a subpanel.  From their I have everything in the
> garage ie washer dryer water heater overhead outlets motion
> lights flourescant strip lights 240v heater wired with thhn wire
> ran in 1/2 EMT.  I even made sure that the track the garage doors
> roll up on was bonded to the EMT.  Basically anywhere you put a
> meter in their its going to read .17 ohms even the metal
> steelcase desk is bonded. Along with the filing cabinet.  Now I
> got those fancy red isolated ground receptacles with the green
> delta triangle.  The ground screw is not connected to the
> mounting strap on the outlet so your ground wire is isolated
> except when you connect the ground wire to the ground bar in the
> subpanel which is connected through the EMT back to the box
> holding the outlet. Maybe I'm missing the point but how is
> different from using a regular outlet.  And yes I have the
> neutral bus seperate from the ground bar per NEC.  Their probably
> overkill but since I have them might as well use them.
>
> John wt5y
> Sent via BlackBerry from T-Mobile
>

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