On Tuesday, June 18, 2013 9:45:08 PM UTC-7, snipped-for-privacy@I.don't.have.a.clue.com wrote:
Maybe you just need a line filter that contains coils and capacitors
because they block surges according to how fast the voltage and
current change, rather than according to the voltage level, as MOVs do.
Typically the more expensive surge protector power strips have both
types of protection, but watch out for those that advertise having an
RF filter but it's only a capacitor.
I like the triplite suppressors with metal boxes, LC filtering and MOV
protection. I don't like plastic contraptions. I think the L does slow down
the spike enabling the MOV to do a better job. Many MOV devices have MOV's
with too high a trip point.
At a segment powered by the line, such as a computer desk, anything
connected to the computer must be grounded to the same ground. The ground
is not protected against another ground point by MOV. Signal grounds can
fail at very low voltage levels. Makes sense to use a protect strip with
plugs for telephones, and other data connection.
Have to mention isolation transformers, such as sold by triplite. The
ground is equalized at the transformer, since a new neutral is formed by
tying to ground. The will be no great potential between line and ground,
except if differential surge is created on line. Spikes would automatically
I still have an old Heathkit spike and voltage monitor which no longer
works. I had given Heathkit recommendation of adding a ground monitor to
the circuit, but they sort of went away.
One time I had power going off and on. It was then a main suppressor blew.
I'm always concerned with things in the house to cause backward ac flow
against the main flow causing excessive voltage. Motors are still turning.
It's my theory. Thats why I like local suppressors on equipment. if
lightning hit a nearby line or your house, things will fail regardless. I
had a lightning strike my tree. Didn't notice any failure, but years ago I
had a modem go out in the computer, after a loud crack.
After that in installed MOV's on phone line.
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