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Old 08-16-2013, 08:54 AM   #46
Common Sense Common Guy
 
Join Date: Oct 2012
Location: So. IL near STL
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Bad wiring of Portable Power Panel


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Originally Posted by Philly Master View Post
each POCO has their own set of specs for temp power also .. the pole and how it is installed etc etc... all get inspected ...
...and sometimes they're even questionable.

We had a one-day event here recently where the municipal power company set up some temporary metal poles in the parking lot, connected a panelboard much like the one pictured here based on a CH panel, 6 20A circuits each connected to a standard duplex receptacle. It was a standard three-wire service feeder from a nearby transformer about 150 ft away.

The problem? No equipment ground, or at least none to speak of. We plugged an electric car into it, and while it detected a ground (likely through the edge of the temporary panel touching the metal pole through some moisture in the concrete), in less than 2 minutes it had stopped charging due to faulty ground. No grounding electrodes, and no bonding.

It worked for everything else, but the car chargers are very intelligent and will simply refuse to charge without a good, consistent ground.


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