[GreenKeys] Grounding and GFI's

[Bob Camp]

Hi

That sort of issue may be what has driven them to the "odd" GFI's. Who 
knows?

Certainly it's well worth checking this sort of thing (neutral separate 
from ground) on a device like a Teletype. With almost all of the wiring 
available to be "improved" who knows what may have happened over the 
years.


	Take Care

		Bob Camp
		KB8TQ


On Feb 13, 2005, at 1:45 PM, Buzz wrote:

>
> Then there's the problem of a grounded neutral.
> http://www.softcom.net/users/buzz/temp/Linenoise.html
>
> Buzz
>
>
> On Sun, 13 Feb 2005 10:37:49 -0500, you wrote:
>> Hi
>>
>> GFI's are a significant problem when it comes to older gear. Since 
>> they
>> trip out on minor current imbalances they are really designed to work
>> with gear that has total isolation of the AC line to ground. The other
>> thing that they depend on is a single path back to ground *through* 
>> the
>> GFI. It's this second requirement that often gets messed up. Cross
>> grounding gear between different GFI'd circuits is a no-no. Running a
>> grounded antenna to the chassis of a GFI'd radio is also against the
>> rules. If the Model 28 is on one GFI and the computer is on another 
>> GFI
>> that's a problem if there is a direct ground connection between the
>> 28's keyboard and the frame ground on the RS-232 input on the 
>> computer.
>
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