Smitty Two wrote:

In article ,
"Robert11" wrote:

Hello,

Having a new service box installed in a residence.

Electrician has never used these before, so thought I'd ask here.

Was thinking of purchasing, and having him install, an Intermatic Whole
House Surge Suppressor
Model 4870 in the new box. Have had several large lightning storms in the
past, and one nearby strike fried the control board on our furnace ! The
Intermatic unit isn't all that expensive, about $80 or so.

Any of you folks ever used this model ?

Worth doing ? Thoughts on ?

BTW: If they do ever take a big hit, do they (usually) fail open or closed
?

e.g., would the MOV's be shorting the hot to neutral/ground after a big hit,
such that the unit would have to be removed prior to re-initiating service ?

Thanks,
Bob

I'd guess that for $80, you're just buying a single premium lightening
strike insurance policy. If you want actual protection, look to the
professional stuff:

http://www.lightningprotectioncor.com/

Give my friend Chester a call out there and he can recommend something.

You should not think of lightning protection and surge protection as
being synonymous. There are plenty of surges on the power lines that
have nothing to do with lightning. I put the Square D "Surge Breaker" in
my QO panel, I don't recall the exact price but I think it was well
below $80. The normal surge suppressers work well for non lightning line
surges as well as induced surges from nearby lightning strikes. They
complement, not replace lightning protection devices such as air
terminals (lightning rods) and other technologies. In any event it is
not generally economical to lightning harden a residence to the point of
being able to survive a direct hit.