[R-390] Isolation transformer question

[Gene Dathe]

Gene wrote:

>Yes, you lose protection.  The GFI measures a difference in current between 
>hot and neutral.  Hook up the isolation transformer.  You can touch one 
>winding and not get a shock because you being at ground does not complete 
>the circuit.  However, grab both windings and you'll electrocute  yourself.

Sure, but that's not what a GFI prevents.  If you are well insulated
from ground and grab the hot and neutral sides of a GFI outlet, you
will get a shock and the GFI won't trip.  But if you grab the hot and
house ground, the GFI will trip.  With a regular non-GFI outlet, hot
and ground will give you the same shock that hot and neutral will give you.

With an isolation transformer, you can grab either secondary leg with one 
hand and your house ground with the other, and you won't get a shock.

Best regards,

Don


I concur.  Grabbing hot and neutral anywhere anytime is a bad idea!

My original post may have been unclear.  (Not the first time!)  By 
installing an isolation transformer, on a line equipped with a GFI, you 
*lose* the protection of the GFI.  You *gain* the protection of the i.t.   
Two different ways to provide protection about 50 years apart.  Use one or 
the other.

With the R390A, you can:
1. Use an isolation transformer and run as is.
2. Use a GFI and upgrade the line filters in the radio up to modern 
standards.

Either way will get you a radio with a shock-free chassis.

Have fun,  Gene

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