Re: Surge / Ground / Lightning

On 3 May 2008 09:46:09 GMT, phil-news-nospam@[EMAIL PROTECTED]
 put finger to
keyboard and composed:

>In alt.tv.tech.hdtv Franc Zabkar <fzabkar@[EMAIL PROTECTED]
> wrote:
>| On Thu, 1 May 2008 13:30:31 -0700 (PDT), w_tom <w_tom1@[EMAIL PROTECTED]
> put
>| finger to keyboard and composed:
>| 
>|>On May 1, 2:18?pm, ransley <Mark_Rans...@[EMAIL PROTECTED]
> wrote:
>|>> Whaaat, you say my Triplights that offer a life time warranty to
>|>> damages from from surges and lightning offer non such ?claim or
>|>> warranty, thats pure barf. Triplight surge protectors are only one
>|>> step a homeowner needs to hopefully protect you. Ive been hit several
>|>> times, anything you do helps a bit.
>|>
>|>  Actually some things installed will decrease protection - ie the TV
>|>destroyed because the plug-in protector earthed an 8000 volt surge
>|>through it.
>| 
>| Can you elaborate on this by showing us the path taken by the strike
>| through the TV?
>
>A surge will take _every_ path.  Where that ends up with a voltage
difference
>somewhere, anywhere, that exceeds the device breakdown voltage, then you
will
>have current flow across there.  And if that breakdown means damage, as
it
>would for things like a CMOS circuit component, the device would be
damaged.

True but irrelevant to my question. I wanted specific examples in
sup****t of the claim that "some things installed will decrease
protection".

A strike on the mains would be clamped to the earth pin by MOVs. It
may still be that the antenna provides a second path to earth which
would mean that the TV could be damaged that way. However, the absence
of an earth pin would result in an even higher differential voltage
between mains and antenna which would mean an even greater likelihood
of damage. OTOH, if the strike arrived via the antenna, then the
presence or absence of the earth pin should make very little
difference AFAICS.

- Franc Zabkar
-- 
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