Pete,
Surge diversion to the ground conductor can raise the ground potential
unequally between equipment. If the rise and fall of the ground potential
is equal across interconnected equipment on a branch circuit, there's little
issue. During a surge event, small amounts of resistance can create large
amounts of potential difference between grounded equipment.
By storing the surge energy and slowly dissipating it onto the neutral (a
conductor actually meant for carrying current), the surge event does not
create a potential difference between grounded equipment:
http://www.surgex.com/library/22001.html
http://www.brickwall.com/how-it-works.html
>From the descriptions in the above links, you can see why the ONLY place for
"all three modes" of MOV protection is at the service entrance.
Paul, W9AC
----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: <towertalk@contesting.com>
Sent: Monday, January 03, 2011 10:13 AM
Subject: Re: [TowerTalk] Fwd: WHOLE HOUSE SURGE SUPRESSORS
> Why is this, Paul?
>
> 73, Pete N4ZR
>
> The World Contest Station Database, updated daily at
> www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net, blog at
> reversebeacon.blogspot.com,
> spots at telnet.reversebeacon.net, port 7000
>
>
>
> On 1/3/2011 10:01 AM, Paul Christensen wrote:
>>> The gold standard is to have both... whole house to protect heavy
>>> equipment
>>> like AC compressors, etc. then end-point protectors for LCD TVs,
>>> refrigerator CPUs, PCs, Ham Radios, etc.
>> But only if the secondary suppressors are single mode (fault current path
>> to
>> neutral), rather than devices that offer the popular "all three modes" of
>> protection. If secondary protection is desired after installing a
>> whole-house protector, it should only be single mode (e.g., SurgeX,
>> Brickwall, ZeroSurge). Except for the whole-house surge protector,
>> "three
>> modes of protection" devices have no place in a home.
>>
>> Paul, W9AC
>>
>> _______________________________________________
>>
>>
>>
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>>
>>
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