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Re: MOV lightning arrestor in place of safety gap...MCOV?

Original poster: "Harold Weiss" <hweiss@xxxxxxxxxx>

Hi All,

I have one installed internally on my 10KVA pig, and there was a sticker saying not to test it.

Just checked.

CAUTION
MOV arrestor installed.  Do not overvoltage test.

So it seems that testing might trash them for lightning protection purposes.

David E Weiss

Original poster: "J. Aaron Holmes" <jaholmes@xxxxxxxxxxxxxxxxxx>


Hard to say.  I'm guessing it has mostly to do with
thermal breakdown.  These are rated for 10kA surges,
and the datasheet indicates that part of the test
procedure includes a 500A two-second fault current
test.  Yow!  I'm pretty sure my pig won't do that! :)

--- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "david baehr" <dfb25@xxxxxxxxxxx>
>
>
> These 'Arrestors' sound like a good idea, but, do
> they have a limited life
> as with small MOVs , ? , they can only take so many
> hits ?
>  >From: "Tesla list" <tesla@xxxxxxxxxx>
>  >To: tesla@xxxxxxxxxx
>  >Subject: Re: MOV lightning arrestor in place of
> safety gap...MCOV?
>  >Date: Sun, 01 May 2005 11:11:53 -0600
>  >
>  >Original poster: "David Rieben"
> <drieben@xxxxxxxxxxxxxxx>
>  >
>  >Hi Aaron,
>  >
>  >PS-Overvolting these arresters does NOT harm them
> as that's exactly
>  >what they're designed to do on the utility primary
> line. Once the
>  >line
>  >voltage
>  >drops back below their cutoff voltage, they act
> just like an open
>  >circuit
>  >once again.
>  >
>
>
>