Thanks Don. It's a metal case held together with screws, so there
should be no trouble opening it up to clip out the MOVs. The question
is whether I should do that. You pay extra for them, after all. :=)
Alan N1AL
On 2/1/2013 2:44 PM, Don Wilhelm wrote:
Alan,
It should be a simple matter to open the strip and clip out the MOVs
(unless the construction is glued plastic).
73,
Don W3FPR
On 2/1/2013 4:43 PM, Alan Bloom wrote:
The problem is it is getting hard to find decent-quality outlet strips
that DON'T have surge protection built in. I am currently building up
a second studio for KBBF-FM, a community bi-lingual station here in
Santa Rosa. I wanted an outlet strip with some sockets spaced far
enough apart to accommodate several wall transformers. I found the
perfect device at Home Depot, but it has surge protection built in.
Should I crack it open and remove the MOVs?
Alan N1AL
On 2/1/2013 12:02 PM, Jim Brown wrote:
On 2/1/2013 10:21 AM, Mark Bayern wrote:
Someone brought out the fact that a power strip or some other device
with a surge protector built in should cover everything on that
particular leg. It's a parallel circuit.
Nope. ANY shunt mode device (MOV) operates by conducting the spike to
the green wire or the neutral. The resulting current raises the voltage
on the green wire (which is connected to the chassis of the equipment
plugged into the "protected" outlet) to some very high value, depending
on the spike that sets it off. In the case of lightning, this can be
a lot.
Now, consider equipment connected to two different power strips, with or
without an MOV, or to different locations, or to another ground. ALL of
those other points will be at a different potential as a result of
seeing the same spike, and again, in the case of lightning, that can be
a VERY large difference. it is the DIFFERENCE in potential from one
piece of gear to the other that fries those Ethernet ports, and it would
also fry signal interconnect circuitry for audio and video.
THIS is why MOVs are a really bad idea on branch circuits. Those of us
working in pro audio have LOTS of interconnected equipment, often at
widely separated points, so we learned all of this the hard way nearly
20 years ago. Our solution has been to use SERIES-MODE Surge Protectors,
and that has been quite effective. SurgeX and Brick Wall are the only
two companies I know of that have licensed the series mode patent. Their
products are not cheap, but they work. I have SurgeX protectors on all
of my ham gear, computers, and audio/video gear.
73, Jim K9YC
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