[Amps] MOVs

[Paul Baldock]

If the amp is running off 240V where in the USA this is symmetrical 
about ground and then the MOV is placed between the two phases, it 
seems to me that there would not be a surge current to ground.

- Paul

At 10:45 PM 1/22/2014, Jim Brown wrote:
>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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