Surge Suppression vrs. Lighting and Power Spikes


OK,

Here is something I have thought about on many occasions while jamming out and then being rudely interrupted by an overhead lightning storm. Should I continue my session while the storm is overhead or should I switch everything off and wait until it blows over before continuing? I have chosen to switch my equipment off but leave it plugged into the wall.

Is powered on audio equipment any more vulnerable then powered off or in standby mode audio equipment during a lightning storm or power grid spike? I mean if your house gets hit by a direct lighting strike that was the result of having an old school TV antenna on your roof or if the power station down the street gets zapped the wave of electricity is coming your way weather you like it or not, correct?

As an example, if we take 3 houses that are all on the same power grid into consideration during said event, does the house who happens to be drawing the most current at the time of the event have a higher likelihood of being the one who gets chosen by the power spike as it's target for discharge? The term magnet comes to mind as another way of thinking about it.

Now I would imagine this spike has the potential of being very powerful. I have seen some numbers on the web stating that a direct lightning strike can generate anywhere from 1000 to 100,000 AMPS of juice. If these numbers are even somewhat close to being accurate then even the fanciest surge protection/power distribution device isn't going to save your equipment.

If your lucky enough to have the direct hit occur at the power station down the road then I assume the power company has some kind of buffer device that absorbs a large portion of this electricity before it reaches your house but this is just an assumption. If they do have some kind of buffer then maybe your surge protection device has a better chance of survival since the impact would be greatly reduced; maybe even to the levels that most surge protectors found in the home can tolerate and maybe not.

It almost seems that the only real safe bet would be to fully unplug your power distribution device from the wall since we obviously can't predict how the power spike will arrive either thu a direct hit or a possible buffered hit.

I'm curious to know what the general consensus is on this topic and what others do when faced with a storm overhead?

Please feel free to post your thoughts..Thanks
eniac26

Showing 6 responses by hifihvn

Unplugging everything you can is the best bet. There is protection (arrester plus other?),on the utility end that should transfer most of that strike to ground. But, if the pole or one in your area gets hit, there is some spike voltage(when their stuff works right) that does get through. I would not count on any devise for in the home as a sure thing for even this type of spike. If you want to risk leaving your stuff plugged in, using a quality surge protector may help, but not for sure. A direct hit to your house is the worse risk for your equipment, and possibly occupants. I've seen pictures where a lightning bolt blew right through the roof and struck an object to complete its path. One was a sink (going for metal pipe?), that half was missing, another was a range with a big burn on the corner of it going by memory. Lightning does things that are odd. I've seen lightning strike the ground right next to a telephone pole! So with all that said, unplug. After seeing that shattered sink, you could see why they say stay out of there during a storm. I imagine if you Google lightning strikes, or check it out on Youtube, you'll probably see some interesting pictures. Anyone might give it more respect too, after seeing the pictures, or videos.
People believe that grounded antenna attracts lightning. It is exactly opposite - ungrounded antenna attracts lightning since it is floating (separated from the circuit by input transformer) and charged by the friction of the wind to very high static voltages making your house looking (electrically) like a skyscraper.
Kijanki

I'm guessing that why the NEC (national electrical code) now requires you to bond it with the homes electric ground (if memory is correct), to lesson any static buildup that my attract a direct lightning hit.
I should have said, all of the ground rods(antenna included), need to be bonded with your homes electrical grounding block, if my memory is correct. Years back, I think you could just use an arrester and ground rod alone, without the all of the bonding.
Yes, that is a problem with ground rods alone. Might be it's part of the reason for the bonding to the homes ground too. Plus less chances of arcing over I imagine. I saw that link Jea48 posted and couldn't find it again. Thanks for posting it. Good info. I guess they've learned a lot from those experiments, with shooting those rockets up into the clouds in Florida. A lot of those skyscrapers have some big thick steel plates under them, where it's nice and moist, plus all the contact with the moist ground must be the reason they take all those strikes, without any problems. Still better odds with a wire with a ground rod will direct a lot more toward the ground, instead of coming straight down through the roof I would think. Years back before cable TV, our roof antenna was on a tripod, with a 4 gauge solid copper ground wire,and it still had me moving away from that end of the room below it, just in case, during a nasty storm. Another link to read. [http://www.ece.ufl.edu/announcements/news/2003/lightning-powerlines.html]
A Youtube link to watch if somebody else didn't post it first.
[http://www.youtube.com/watch?v=2wY_t7zVIXY]
Better slow motion video.[http://www.youtube.com/watch?v=-bvmEYxEYiA&feature=related]