So when you buy a generic surge protected power strip, do they have the 3
way MOV protection installed in them?
----- Original Message -----
From: "Jim Brown" <firstname.lastname@example.org>
Sent: Monday, 03 January, 2011 1:50 PM
Subject: Re: [TowerTalk] Fwd: WHOLE HOUSE SURGE SUPRESSORS
> Paul is exactly right. I've spent the last 40 years in pro audio and
> large sound systems, where lots of expensive equipment is
> interconnected. We learned about the issues that Paul is talking about
> the hard way, and came to the same conclusions that he is articulating.
> The SurgeX products are specifically marketed to the pro audio world,
> and are highly respected. I began specifying them for all of the large
> systems I designed about 15 years ago. About the same time, I bought
> them to protect the expensive gear in my home and office. About 7 years
> ago, SurgeX began hiring me to teach classes on Power and Grounding at
> industry conferences, and to write a tutorial on the subject. I'm still
> teaching those classes, and recently updated the tutorial to cover power
> systems outside North America. Less than 5% of the class content
> addresses lightning protection or their products.
> It's also ABSOLUTELY CRITICAL that everything connected to the power
> system be properly bonded together per NEC. This includes EVERY ground
> rod, the CATV ground, the TELCO ground, all antenna grounds, the shack
> ground, conductive cold water, and any building structural steel.
> BTW -- the SurgeX and Brickwall products are based on the same rather
> interesting patent. Rather than being shorted out by an MOV, the surge
> is stored in a large inductor, then discharged slowly back into the line
> after the event. Thus, the surge protector does not raise the
> potential of the equipment ground, where it cause failures of
> interconnected equipment. An important limitation of this concept is
> that it is not practical to build inductors rated for circuits of more
> than about 30A.
> 73, Jim K9YC
> On 1/3/2011 7:59 AM, Paul Christensen wrote:
>> Surge diversion to the ground conductor can raise the ground potential
>> unequally between equipment. If the rise and fall of the ground
>> is equal across interconnected equipment on a branch circuit, there's
>> issue. During a surge event, small amounts of resistance can create
>> 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:
>> > 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.
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