w_tom wrote:
On May 7, 2:37 pm, VWWall wrote:
How can one find this rating for a particular device?

UL makes no effort to measure a protector's protective ability.

Cuttler Hammer says you are wrong.
http://tinyurl.com/63594d


Approval may be obtained by undersizing MOV's thermal fuses so that
a protector will disconnect MOVs faster during a surge; leave the
appliance to fend for itself.

Of course that applies to service panel and plug-in suppressors. But CH
says a suppressor has to have tested functionality (above).

w_ just buys cheap Chinese knock offs, so his suppressors fail regularly.


Also required for UL approval is total number of joules.

Provide a cite. Why does your favored manufacturer SquareD not provide
Joule ratings?


A 'whole house' protector uses all joules during all types of
surges.

Depends on the surge.


How effective are 'whole house' protectors? Well, a friend suffered
when the 33,000+ volt transmission line fell upon his 4000 volt
distribution line. Literally everyone powered from that B phase had
electric meters explode up to 30 feet from their pans. Many had
damage to plug-in protectors and to powered off appliances plugged
into those protectors. But my friend suffered no damage, except to a
meter that exploded off his building. He had a properly earthed
'whole house' protector. A protector is not rated to provide that
protection. But properly installed protectors with sufficient joules
will provide more protection than rated.

Neither service panel or plug-in suppressors will survive extended
overvoltage. It rapidly kills MOVs. w_ is using anecdotal evidence
(with no cite) to suggest service panel suppressors protect from crossed
power lines. More lunacy.


Which protectors actually provide better protection? Products from
a list of responsible manufacturers such as Intermatic, Square D,
Siemens, Polyphaser, GE, Cutler-Hammer, Keison, and Leviton.

Being responsible, they all make plug-in suppressors except SquareD.
SquareD, for the ‘best’ service panel suppressor, says "electronic
equipment may need additional protection by installing plug-in
[suppressors] at the point of use."


Still missing - a link to another lunatic that says plug-in suppressors
are NOT effective.

Still missing – answers to embarrassing questions:
- Why do the only 2 examples of surge suppression in the IEEE guide use
plug-in suppressors?
- Why does the NIST guide says plug-in suppressors are "the easiest
solution"?
- Why do all but one of w's "responsible manufacturers" make plug-in
suppressors?
- Why does SquareD say in addition to their "whole house" suppressors
"electronic equipment may need additional protection" from plug-in
suppressors.
- Why aren't airplanes crashing daily when they get hit by lightning (or
do they drag an earthing chain)?

For accurate information read the IEEE and NIST guides. Both say plug-in
suppressors are effective.

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bud--