[Amps] MOVs

[Saandy]

Guys , think! Nothing gets conducted to a point not connected anywhere!
A MOV is intended to a supposedly safe limit a voltage differential between
2 points. Protection between the line and something ground connected is
achieved with a common mode choke.
It's more important to remember that MOV's have another problem: they have a
finite life time. They can be zapped a given number of times only; lattice
crystal inside get destroyed every surge and after a while you end up with
no protection, even though you think you're safe.
Use them sparingly and with circumspection!
Alex	4Z5KS

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Jim Brown
Sent: Friday, January 24, 2014 8:32 AM
To: amps at contesting.com
Subject: Re: [Amps] MOVs

On 1/23/2014 7:18 AM, Paul Baldock wrote:
> 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.

Right.  The problem comes when you take the MOV to the ground.

73, Jim K9YC

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