2020 Residential Services-- Surge Protection - Page 4 - Electrician Talk - Professional Electrical Contractors Forum
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Old 10-06-2019, 06:06 PM   #61
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Although lightning is a surge, not every surge is lightning.

A MOV that clamps an 800V surge is not going to have the same reaction as a MOV that attempts to clamp a nearby lightning hit.
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Old 10-06-2019, 08:32 PM   #62
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Where would this 800V surge come from and what would terminate it (make it stop)?



I ask in terms of duration and what sort of protection scheme would coordinate with the surge supressor.



I am no expert on transmission and distribution but I don't see how poco equipment can supply much more than a few percent extra voltage.


Short of a catastrophic failure in which case things get real interesting, more like lightning.
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Old 10-07-2019, 07:46 AM   #63
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Quote:
Originally Posted by Jerome208 View Post
Where would this 800V surge come from and what would terminate it (make it stop)?



I ask in terms of duration and what sort of protection scheme would coordinate with the surge supressor.



I am no expert on transmission and distribution but I don't see how poco equipment can supply much more than a few percent extra voltage.


Short of a catastrophic failure in which case things get real interesting, more like lightning.
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Old 10-07-2019, 08:03 AM   #64
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If you search you'll find zillions of pictures like this one:



There are similar pictures for surge strips. I found a surge strip that had cooked off pretty bad after a lightning storm, a bit scary. There are manufacturers selling surge strips with the MOVs in metal housings now. I am switching back to the old Tripp Lite Isobars, which are excellent and have a metal case.
Yep, sometimes they catch on fire. !

Scary huh
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Old 10-08-2019, 09:33 AM   #65
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I was standing next to a crappy 'surge protector' power strip that lit up like that once. Thing had a mini fridge plugged into it. One minute it was fine, the next there was a little camp fire next to me. In a fertilizer plant.... and no fire extinguisher in sight.

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Old 10-08-2019, 10:50 AM   #66
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Where would this 800V surge come from and what would terminate it (make it stop)?


I struggle myself to visualize this because it's a lot harder to think about than current in wires in circuits.



In a lightning strike, there's a surge in ground potential at the point of the strike that's immense. It dissipates in a gradient around that point in the ground. Of course the ground itself has resistance, there is voltage drop across the resistance, the voltage at any point in the gradient is lower than the voltage at the strike point, the further you get, the lower the voltage.



A similar thing happens if a primary distribution line is lying on the ground say across the street from your house, this will raise the ground potential at the rod in your house, but not as much as it would if the primary line was bolted to your ground rod.
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Old 10-08-2019, 11:11 AM   #67
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I struggle myself to visualize this because it's a lot harder to think about than current in wires in circuits.
Maybe think about it as an electrical earthquake. The lightning strike point is the epicenter & gradients of damage. Or a dam breaking & the gradients of damage.
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