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430 posts

Ultimate Geek

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# 179434 8-Sep-2015 17:32
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Recently my neighbour's house took a decent lightning strike on the roof, setting his house on fire and causing untold havoc.  I was outside watching the hail-storm when it hit, and as my eyesight came back my wife came out to tell me that the smoke had been let out of our TV.  The outcome was that ALL of the HDMI ports on our Vodafone T-Box, Sony Bravia TV, Denon AV receiver, and Playstation were destroyed.  The only survivor in the whole setup was the WD Media player.  There was a good surge arrestor on the power supply and none of the power supplies or analogue ports were damaged, just the HDMI ports.  I'm wondering if the surge came through the Vodafone cable, although the modems were both OK.

The good news:  Service Plus in Wellington repaired the TV, which required replacement of the main board, and somehow persuaded Sony to pay for it (out of warranty).  Apparently there was no evidence of a surge in the set, the power supply fuses were intact, but they could still smell the damage.  Also they put a new front bezel on the set FOC after it got a bit scratched in the workshop.  Excellent!

Looking for a replacement for the Playstation (which we used for Netflix, Lightbox, YouTube and playing DVD's) I found the Samsung BD-H6500, which does all of those things and more. And better than the Playstation because it works with the Harmony IR remote.  Also excellent!




McLean


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  # 1381927 8-Sep-2015 18:00
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What exactly do you mean by a "good surge arrestor" - do you have a make model? is it a plug in unit?

Got to remember you are dealing with quite a large amount of energy with a lightning strike, it would be unusual for a surge arrestor (of any kind) to actually survive a direct strike, the whole point of them is that they take the surge and fail to keep your equipment safe.

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  # 1381933 8-Sep-2015 18:06
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gregmcc: What exactly do you mean by a "good surge arrestor" - do you have a make model? is it a plug in unit?

Got to remember you are dealing with quite a large amount of energy with a lightning strike, it would be unusual for a surge arrestor (of any kind) to actually survive a direct strike, the whole point of them is that they take the surge and fail to keep your equipment safe.


They wont stop a nearby lightning strike, way to much energy. 

 
 
 
 


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  # 1381935 8-Sep-2015 18:11
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Lightning jumps a significant distance from the clouds to the ground so the small 'gap' in a surge protector is not going to present much of a barrier. 

Maybe surge protectors are more use against regular powergrid fluctuations 



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  # 1383299 9-Sep-2015 11:20
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gregmcc: What exactly do you mean by a "good surge arrestor" - do you have a make model? is it a plug in unit?


The switchboard has a Schneider 10kA SPD after the main switch with what looks like a full size connection to the neutral bar. The MCB on the SPD didn't trip but the surge was probably too fast for that.  Plus the usual no-name multi-box at the equipment with built-in surge protection. I'm thinking I might upgrade the main SPD to 20 or 40kA if I can find a 1-phase one.

The guy who brought the replacement T-Box this morning knew all about that lightning strike.




McLean


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  # 1383324 9-Sep-2015 11:51
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I would say the surge most likely came through the Vodafone cable and/or telephone line. Check your line speed too as you may find the Modem really are affected. Back in 2010 we had a lightning strike on a Kauri tree on our boundary. The surge was through our power line and phone line neither of which had any surge protection. While our only equipment killed by the power line surge was our DVD Recorder the surge on the phone line was somewhat severe. It took out the LAN circuit on my PC and reduced speed on my Modem to near dial- up speed. Fortunately our insurance replaced the DVD Recorder and PC Motherboard and Telecom replaced the Modem. Our phone line was destroyed somewhere between our property and the local Exchange so they just swapped us to another pair. The tree didn't fare much better and has now been cut down before it fell down. We were fairly lucky as our next door neighbour lost all his electrical/electronic equipment including the Hot Water Cylinder element.

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