Separate earth for USA devices
Separate earth for USA devices
(OP)
Hi,
A number of devices from the USA have different voltage than in Australia.
The guy has his own transformer from 415V at the primary side L-L to 208V at the seconday.
There is a distribution board at the secondary taking tge one output fron the transformer and distributing it via single phase and 3 pgase breakers to the loads.
The question is: those devices require earthing. Shall it be the same earth as the primary or a separate dedicatex earth?
In Australia earthing is imperative for class I equipment even if there is a GFCI/RCD protection.
A link to some correct litterature is very much appreciated.
Thanks.
A number of devices from the USA have different voltage than in Australia.
The guy has his own transformer from 415V at the primary side L-L to 208V at the seconday.
There is a distribution board at the secondary taking tge one output fron the transformer and distributing it via single phase and 3 pgase breakers to the loads.
The question is: those devices require earthing. Shall it be the same earth as the primary or a separate dedicatex earth?
In Australia earthing is imperative for class I equipment even if there is a GFCI/RCD protection.
A link to some correct litterature is very much appreciated.
Thanks.






RE: Separate earth for USA devices
The same ground grid may be used for both the 415 Volt system and for the 208 Volt system.
Bill
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"Why not the best?"
Jimmy Carter
RE: Separate earth for USA devices
RE: Separate earth for USA devices
Well spotted Scotty, thanks will call his attention. There seems to be a mix of small motor and small electronic loads.
Waross thanks for the clarification, we're trying to figure out what the term "dedicated earth" means in this case. We thought that they meant a separate earth grid, remote from the one for 415V but as you say it can be the same, with or without GFCI/earth fault differential protection.
What could they be asking for?
RE: Separate earth for USA devices
I've had a little time to think about this, because my wife wants to move to another country where the voltage is 220 V with no ground reference.
Strange how there 220 V light bulbs look like they might fit where we use 120 V light bulbs.