Taking ESD A bit too far... - Page 1
Forum section: electronics / general

author: TheBay
author_rank: Unknown
timestamp: April 12, 2018, 09:47:52 pm
content: Gobsmacked at thishttp://www.groundology.co.uk/earthing/grounding-sheetsLet's hope anyone using this has RCD's fitted and doesn't mind the tingle off their phone if plugged in to a typical "Double insulated" SMPS.

author: Cyberdragon
author_rank: Super Contributor
timestamp: April 13, 2018, 04:04:19 am
content: QuoteGrowing popularity...whith who? Hippies? Who would want to counterfeit?Of course they aren't allowed on big market sites, they're probably highly illegal (electrical certification wise) and also totally a scam! *cough* Ebay wouldn't care though... *cough*

author: TheBay
author_rank: Unknown
timestamp: April 13, 2018, 05:13:20 am
content: Imagine it capacitively coupled with an electric blanket

author: Brumby
author_rank: Unknown
timestamp: April 13, 2018, 07:36:20 am
content: NOW you're cooking!

author: Electro Detective
author_rank: Super Contributor
timestamp: April 13, 2018, 09:06:21 am
content: Another branch of Audiophoolery Inc. ?BS Businesses must be boomingTime perhaps for yet another EEVblog -Group Facepalm-......

author: mcinque
author_rank: Unknown
timestamp: April 13, 2018, 06:05:24 pm
content: Imagine a lightning striking the ground near the mains earth pole outside the house, with some residual energy climbing up on the earth cable till the socket and the bed.

author: Electro Detective
author_rank: Super Contributor
timestamp: April 15, 2018, 01:55:01 am
content: Quote from: mcinque on April 13, 2018, 06:05:24 pmThat'll really get the dutch oven fired up

author: Vtile
author_rank: Super Contributor
timestamp: June 11, 2018, 10:01:41 pm
content: People do forget how PE works. No need of lightning strike, just heavy shortcircuit failure in the same outlet group (copper losses / cable inductance)On the otherhand this isn't any more dangerous than properly grounded kitchen sink or freezer.

author: m98
author_rank: Frequent Contributor
timestamp: June 16, 2018, 09:17:54 pm
content: Sure this is kind of a BS use-case, but why are you guys freaking out so much over product safety? This is in principle just as safe as any other ESD grounding equipment you use in your Lab as it uses a 1M protection resistor. The outside grounding rod might be a bit whacky, but even there I'm not sure how you think someone could be electrocuted in his bed from a lightning strike?

author: HwAoRrDk
author_rank: Super Contributor
timestamp: June 20, 2018, 10:34:42 pm
content: I think theiryoga and fitness matis a good idea. You know what they say about sitting down all day being unhealthy, so ideal for the electronics lab for getting some stretching exercises in while remaining ESD safe.

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 21, 2018, 07:01:26 am
content: Quote from: m98 on June 16, 2018, 09:17:54 pmOh yes you bloody well can be...http://www.weatherimagery.com/blog/can-lightning-strike-inside-my-house/Quotehttps://www.mikeholt.com//mojonewsarchive/LSP-HTML/HTML/Lightning-Damage-Photos~20050802.phpWhat would happen if you were connected to one of those sockets...

author: m98
author_rank: Frequent Contributor
timestamp: June 21, 2018, 12:16:02 pm
content: That's just not a thing in properly built houses. Also, there are safety evaluations regarding ESD equipment in workplaces during lightning strikes, and there aren't any reported cases of anyone getting shocked that way. Or are you hysterically running out of the lab as soon as you hear some thunder?

author: bd139
author_rank: Super Contributor
timestamp: June 21, 2018, 12:46:07 pm
content: I worked in a place which the building had a properly strapped earthing system. The lightning hit the conductor on the roof, went down the side of the building, decided to nip inside for a bit via a window frame, wrecked £50k of kit in a server rack, then popped out again and back down the conductor to ground. It doesn’t follow rules and building regs.If there was a high probability of strike I tend to do something else for a bit now.

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 21, 2018, 03:59:43 pm
content: It is rare and gets worse if you have a wiring fault. My neighbor's house fried from a strike as well. Not as dramatic as the ones in the photos above but it does happen.Remember, lightning is a static discharge between a cloud and the ground. So it stands to reason that anything connected to the ground, AKA your house wiring (and you if you're a grounding wanker), will become part of the potential difference and have current flow during a discharge.

author: rsjsouza
author_rank: Super Contributor
timestamp: June 21, 2018, 05:19:02 pm
content: Just like others reported, I also have seen what a lightning strike can do in defiance of any protection regulations, even on edifications that were constantly under scrutiny by the local regulatory agencies - in my home town, lightning protection was mandatory on every building and commercial ones were yearly evaluated for compliance.

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 21, 2018, 06:50:24 pm
content: Quote from: m98 on June 21, 2018, 12:16:02 pmYes, you should be afraid, because there are most certainly reports of people being killed or injured this way.https://www.cnbc.com/2017/03/03/how-a-man-was-struck-by-lightning-in-his-own-house.htmlhttps://www.forbes.com/sites/dennismersereau/2017/06/22/stay-indoors-how-lightning-can-strike-even-when-you-follow-the-rules/http://www.dailymail.co.uk/news/article-3108728/Austin-teen-struck-lightning-inside-home-opening-refrigerator.htmlIf you see or hear lightning coming down to the ground nearby, get away from any wiring or large metal objects.

author: BrianHG
author_rank: Super Contributor
timestamp: June 21, 2018, 11:07:20 pm
content: Quote from: Cyberdragon on June 21, 2018, 06:50:24 pmI received from lightning strikes a jolt once in the shower and once through a telephone hand-set. Luckily, they each were the equivalent to a super severe electrostatic shock. In those grounding sheets, It might have stopped my heart.When I was a kid, a tree just outside right in front of my summer camp cabin in the woods was hit just as I was about to go outside. The flash was blinding, yet, strangely, not too loud. It must have been a weak strike.

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 22, 2018, 02:31:45 am
content: Our neighbors house got hit on the wireless dog fence (or nearby). I think one of our trees got hit too since during a storm last year sometime there was a loud bang and a few months ago I was outside and spotted what looked like a still healing char/burn mark on the tree.Strikes vary and can range in sound when nearby from a gunshot to dynamite.

author: BrianHG
author_rank: Super Contributor
timestamp: June 22, 2018, 04:27:11 am
content: Quote from: Cyberdragon on June 22, 2018, 02:31:45 amIt is odd that the tree which was hit outdoors in front of me sounded more like having your ears inside a studio grade xenon flash tube. It truly wasn't too loud, just an instantaneous snap like ignition. (The tree being many 2 story tall bushes well crammed together, so we could not identify the one which was struck without working our way into the thick of it, and I also know that tree strikes usually have bark flying off the trunk with burn marks and sometimes flames yet there was no visible damage...) I know that thunder from a lightning bolt is always blazingly loud especially when there is such a close strike even if it is weak, but this was some sort of fluke of nature.

author: jmelson
author_rank: Super Contributor
timestamp: June 22, 2018, 09:09:37 pm
content: When you are very close to the end point of a lightning bolt, the sound is often not very loud, like a car door being slammed.As you are at the end of the bolt, all the sound is projected sideways out from the bolt, and you may hear echoes, but the initial sound is pretty modest. I've experienced this a few times.Jon

author: David Chamberlain
author_rank: Frequent Contributor
timestamp: June 24, 2018, 08:21:57 am
content: I want my bed to insulate and isolate me from the ground. Call me old fashioned.