Because MOV's conduct surge currents onto ground, and the IR (and IZ)
drop raises the potential of the chassis. When the "protected" equipment
has a low voltage connection to other equipment powered and/or grounded
at another point, the difference between one chassis and the other often
fries the interface circuitry.
I've seen many well-documented examples of this with audio systems, and
with computers connected by wired Ethernet, no radios anywhere around.
The sharp guys in pro audio stopped using MOVs at least 20 years ago.
73, Jim K9YC
On 1/22/2014 10:11 PM, Jim W7RY wrote:
Why?
On 1/22/2014 9:59 PM, Jim Brown wrote:
On 1/22/2014 8:40 PM, Gary "Joe" Mayfield wrote:
What are folks thoughts
about MOVs on the primary side of the transformer?
Bad idea. ANY MOV on branch circuits is a bad idea.
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