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Why are dishes not earthedSky digital support forum at Sats UK, Everything involved on the hardware and software side of reception of the channels from 28.2/28.5 East BskyB, special focus on fringe reception of Astra 2D for UK free to air channels | |
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30-04-2007
| #26 | ||
| aka Skyman  Join Date: 13-06-2003 Location: Limassol, Sunny Cyprus
Posts: 1720
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My System: 3m(sky),1.8m(astr/hotbird),1m (nilesat)1m(arabsat)diseqc 4,sky plus,humax freesat,visionet 8000s,technomate 5400 ci+ usb super. Satlook nit colour + Horizon hdsm. wii  | A couple of weeks ago,during a thunderstorm,a customer had a direct hit.The lightning hit the tall aerial pole which had two antennas on it.The aerial mixer blew apart,and the cable burnt apart.The aerial cable,and satellite cable came down through a (plastic)pipe from the roof down through the walls.There was an outlet on the wall where both cables pass through on to the next outlet.The plastic cover plate of the first outlet blew apart and the aerial cable ended there. The customer was not home when the lightning struck,and when she came home there was no power.After switching the power back on from the fuse box,the digibox was flashing red light so she unplugged the digibox.When I got there the next day and plugged it back in,the digibox started to smell and give off smoke.There was a dvd player under the digibox which was dead and on the top corner of its case was a small pinprick of a burn mark where a spark must have jumped across from the digibox(which was a pace 2600,shame).Also the lnb died but no marks on it. What I can't understand is why none of these gadgets are earthed these days.Everything including the tv and video have only live and neutral in there cables.Would they have survived if they were earthed? | ||
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30-04-2007
| #27 | ||
| Super Minty Mod  Join Date: 31-12-1999 Location: Fife, Scotland
Posts: 1591
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My System: 1200cc with 100,000,000,000 neurons and 100,000,000,000,000 connections | I very much doubt it. If the surge has melted plastic and cables on its way to the digibox then it's not going to peacefully travel to earth as soon as it reaches it, it'll jump and burn out most of the components it passes through. | ||
  'All you need is duck tape and WD40; if it moves and it shouldn't, use duck tape - if it should move and it doesn't, use WD40' | |||
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30-04-2007
| #28 | ||
| aka Skyman Join Date: 13-06-2003 Location: Limassol, Sunny Cyprus
Posts: 1720
Thanks: 14
Thanked 58 Times in 54 Posts
My System: 3m(sky),1.8m(astr/hotbird),1m (nilesat)1m(arabsat)diseqc 4,sky plus,humax freesat,visionet 8000s,technomate 5400 ci+ usb super. Satlook nit colour + Horizon hdsm. wii | But it should travel down the braid which is connected to the chassis which is earthed so the electronics are bypassed. | ||
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30-04-2007
| #29 | ||
| Super Minty Mod Join Date: 31-12-1999 Location: Fife, Scotland
Posts: 1591
Thanks: 5
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My System: 1200cc with 100,000,000,000 neurons and 100,000,000,000,000 connections | I'm not an expert in this, but I really doubt that anything that melts a cable is going to pass through a box full of electronics without severely damaging it, even if not physically then wipe chips etc. I looked into this for radio a while back, even with an antenna earthed before the receiver, the receivers are still reported to be dead after a direct hit to the antenna, just not as badly damaged (no melting or fire) compared to no earthing. It might however protect connected equipment by preventing it from spreading to all other nearby devices. | ||
| 'All you need is duck tape and WD40; if it moves and it shouldn't, use duck tape - if it should move and it doesn't, use WD40' | |||
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30-04-2007
| #30 | ||
| Sky Remote Breaker...  Join Date: 05-01-2006 Location: Near Pendle Hill, Lancashire
Posts: 4745
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My System: Mostly gathering dust cos there's no room for dishes here... :( The Sleepy Hollow pollracle has spoken! | That's the thing about lightning damaged equipment, even if it looks ok outside (no scortch marks), it's completely fried inside...  | ||
| I think your car looks funny too...... Proud owner of a satellites.co.uk cap & T-Shirt...  (though the latter no longer fits due to my ever expanding waistline!!!) Resident KIRBY Vacuum nut...  | |||
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09-05-2007
| #31 | ||
| Former member  Join Date: 22-06-2005 Location: UK: Kent. Spain: Madrid.
Posts: 676
Thanks: 4
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My System: Sky Plus V3 TDS 470n, Pace 2600CI, Thomson Sky HD, Technomate 1000D, Prodelin 1.8m dish + Invacom Quad C120, CM feed, Lacuna/Wolsey V3 meter | I had a message from Invacom this morning. LNB's should be earthed. They have earth terminals and these should be used- official! | ||
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11-11-2007
| #32 | |||
| Regular Member  Join Date: 14-11-2006 Location: Athens-Greece
Posts: 315
Thanks: 8
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My System: CM 3.0m @ 28.2 w PACE |
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11-11-2007
| #33 | ||
| Former member Join Date: 22-06-2005 Location: UK: Kent. Spain: Madrid.
Posts: 676
Thanks: 4
Thanked 77 Times in 63 Posts
My System: Sky Plus V3 TDS 470n, Pace 2600CI, Thomson Sky HD, Technomate 1000D, Prodelin 1.8m dish + Invacom Quad C120, CM feed, Lacuna/Wolsey V3 meter | I don't know the exactly why they say this. It is probably something to do with equalising the potential between the dish and the ground, making it less likely a lightning charge will pass through the earthed device. The message came from Invacom's technical director, so he should know. I earthed mine to the bolts in the concrete foundation, which would be the same as an earth rod. I doubt earthing it to the house system would be as good, but someone here may know more about it than me. | ||
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12-11-2007
| #34 | ||
| Specialist Contributor  Join Date: 25-04-2005 Location: Austria
Posts: 1778
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My System: 1,25 Fibostop Jäger Smr 1224 & Smo 36 Dual Axsis Motor Dynasat F1 Monterey 140 Drembox 800 sky Pace HD Box Tagra 2,20 M Fullsize Dish Echostar 2,40m Mesh for cband! | only a profesional company,i think,can do good erarthing of antenna systems,but its very expensice,if something happens maybe 3 up to 4 times in 10 years,my household insurance,must pay,and i replace the reiver,that is gone,or what ever! 4 years ago,one of my irte 1,50m crashed in strom,here in maunrains,we have normaly no proplems with storm,maybe every 7 years,and the insurance company payed everthing! when you life near,the ocean,the salt,in the air,is the bigger problem,it destroyes the motor on the antenna! here,normal house hold has only 55 cm.90 cm,dishes,very lonley,so better we move all to cypres and greece,the see the nice ones  | ||
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13-11-2007
| #35 | ||
| aka Skyman Join Date: 13-06-2003 Location: Limassol, Sunny Cyprus
Posts: 1720
Thanks: 14
Thanked 58 Times in 54 Posts
My System: 3m(sky),1.8m(astr/hotbird),1m (nilesat)1m(arabsat)diseqc 4,sky plus,humax freesat,visionet 8000s,technomate 5400 ci+ usb super. Satlook nit colour + Horizon hdsm. wii | The big nice ones seem to attract the lightning . There was a storm in a village a few weeks ago,and a strike on the ground damaged quite a few digiboxes and lnb's . This area has lots of British people with loads of 3m dishes,many shared with up to 4 houses per dish. | ||
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13-11-2007
| #36 | |||
| Regular Member Join Date: 14-11-2006 Location: Athens-Greece
Posts: 315
Thanks: 8
Thanked 6 Times in 6 Posts
My System: CM 3.0m @ 28.2 w PACE |
hmmm, I guess there's just not enough in the Athens area right now.  | |||
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