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Posted by w_tom on June 4, 2007, 3:43 pm
> Surge suppressors are normally use across the contacts
> such as relays contactors and solenoids, purpose of surge
> suppressors is to limit reveres voltage BkEMF and to limit
> arcing across the contacts lengthen life of the item and to
> limit noise on electrical lines.
Snubber circuits are not surge protectors. Arcing only creates
noise and may harm contact life expectancy. These are not surges.
Your telco, commercial broadcasters and 911 emergency response
center install a 'whole house' type protector AND earthing so that
direct lightning strikes never cause damage. Your telephone Central
Office may see hundreds of surges during just one thunderstorm - being
connected to overhead wires all over town - as even demonstrated by
1950 and 1960 Bell System Technical Journal papers. How often have
you been without phone service for 4 days while that computer is
replaced? Surge protection is installed for direct lightning strikes
- also making lesser transients irrelevant. Anyone who is suffering
appliance damage due to lightning should look at themselves as reason
that a protector and sufficient earthing was not installed.
Allentown, being an old industrial town, has many buildings with
earthing that does not even meet post 1990 NEC requirements. No earth
ground means no effective protection. Earthing that must exceed code
requirements. Those who did not upgrade their earthing or thought
some magic plug-in protector would protect them must then proclaim,
"Nothing can protect from lightning". So why do phones work just fine
all through and after the T-storm? Protection from lightning does
work when properly located, sized, and earthed.
A 'whole house' protector for even less than $50 is sold in Lowes
and Home Depot. Protectors that also include the essential and
dedicated earthing wire.
Snubber circuits are for noise. Noise voltages are so low that
surge protectors would completely ignore those tiny spikes. Tiny
snubbers are not surge protectors.
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