These were likely short-term transients. But if the surge breaker
breaks the power to the panel during a voltage transient (of whatever
duration) it does its job, then if it fries that is just a $108 problem
rather than a $500 SC unit problem or TVs etc.? Do I have this right?
I'm trying to figure out the best way to deal with this, and if the
lightning aspect can be helped to, that would be good.
If I understand correctly, putting one of these things in near the main
breaker in the panel causes the main breaker to trip -- the surge
breaker shorts the power to ground so as to trip the main breaker when
it senses surges/transients, etc.
Or they also have surge breakers just for one circuit that just trips
that one circuit, so if I got one of those for the AC unit it would only
protect that device, not everything else on the panel too. As long as I
am putting one in I might as well go for the whole panel protection.
--R
On 7/29/16 12:43 PM, Craig via Mercedes wrote:
On Thu, 28 Jul 2016 12:17:05 -0400 Floyd Thursby via Mercedes
<mercedes@okiebenz.com> wrote:
The manager of the other system on Seabrook Island, just down the road,
said they were getting voltage readings on a 480V line of 420-540V, all
over the map ...
She says the powerco won't guarantee clean power on the Island, so we
are all pretty much screwed on the cost of the equipment. Nice. So I
need to look at getting some surge protectors on my AC units (220V 30A
circuits) -- are there line surge protectors I can wire in at the
shutoffs by the units? Or at the panel?
Contrary to what the others have said, surge suppressors are NOT suitable
for this job!
A surge arrestor will indeed clip surges from motors and lightning. These
are short-term excursions from the normal power.
The power company putting out 270 V (or more) on a 220/240 V line is not
necessarily a sort-term excursion. If it lasts any significant time (say,
tens of seconds), it WILL burn out the surge arrestor.
Craig
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--FT
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