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Old 07-30-2010, 06:33 PM   #1
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Whole house surge protection question for Glen McIvor and others

If you are an electrical engineer I would like to know if you can shed some light on whether whole house surge protectors work and explain how.
I am interested in this one if it REALLY works. Do any of them really work?
I understand a lot of electrical theory and would like to know how they work vs a surge protector for a computer/power bar type.

ps. Sorry about the name goof, should be McIver.
"Cut it twice and it is still too short".

Last edited by yuri; 07-30-2010 at 08:49 PM.
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Old 07-30-2010, 09:59 PM   #2
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here is a discussion at Mike Holts forum


and another very informative article


a very simple explanation of probably the most common type of TVSS is: there is a device (generally a MOV) connected between the hot conductors and the EGC. An MOV will not conduct current until it is presented with it's designed voltage. Then it will conduct and shunt the current to the ground source. So, under normal operating conditions, it is seen as an open circuit. When the voltage level exceeds the design voltage, it conducts the current to ground.

they degrade as they are used and a large hit often destroys them.

One thing I do not see listed for the device you linked is the clamping voltage . In the mike holt thread, if I read it right (i read it quite quickly) the clamping voltage is 800 vac. Not very good. You want a device rated for less. 330 is the target number you want.
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