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Author Topic: Hmm, well, I've had better days.  (Read 578 times)

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Online emjaybee

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Re: Hmm, well, I've had better days.
« Reply #15 on: May 13, 2019, 01:10:12 PM »
A cautionary tale, however the grim reaper was cheated out of another victim. 

45,000 volts is that AC or DC ?  Not sure if it's the volts or amps that does the damage.
 
It’s DC and the current causes the damage. It only requires 50volts between The fingertips to cause enough current to flow through the heart to stop it.

As I was told years ago, "It's the volts that jolts but the mils that kills".
Don't know how correct it is but I was also told that 30mA for 30µs directly across the heart was enough to stop it.


Absolutely.

I'm an apprentice trained electrician, and all these things were drummed into us. On household electrics I always meter before disconnect and after. Just because I've thrown a fuse/switch doesn't mean some chump hasn't wired it badly before. As a kid you stick your tongue on a PP3 for that 'tingle', four weeks into an electrical apprenticeship and I never did it again!

I've had a few belts from HT systems in my early motoring career, remember Gunsons ColourTune? Never been a problem. I've only had three domestic mains voltage belts in thirty years, one from turning on a chiller with a wet hand ( :smackedface:), one from taking the end of an extension lead to help a builder forgetting the other end was still plugged in (serves me right for being helpful), and the other was when a client turned the electric back on (the bill went UP).

The thing is, on a house, most consumer units have a 'trip' which protects you from stuff like this, but on a vehicle/hedge cutter there's no protection.

Hi again Michael,

No replies and no 'thank yous' so hope all OK with you today and you've gone to work as normal.

Did find this on the volt/amp front....

https://www.dribin.org/dave/blog/archives/2003/12/29/amps_vs_volts/

I've often cut hedges and strimmed in the rain as it's my job and had to be done. Think I'll think twice in the future.

Please let us know you're alright.

Cheers weave  :beers:

Ah, been out working this morning, just got home for lunch.

All good now though. Thanks for all your comments.

 :thankyousign:
Sometimes you bite the dog...

...sometimes the dog bites you!

----------------------------------------------------------

I can explain it to you...

...but I can't understand it for you.

Online Bob G

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Re: Hmm, well, I've had better days.
« Reply #16 on: May 13, 2019, 01:27:16 PM »
I always used to do my own electrics in my houses and flats - putting in extensions to ring mains and the like, but I was never happy doing plumbing.

Talking to a plumber, however, he said to me "if I get it wrong, someone gets wet - if a sparky gets it wrong, someone can die".

That's obviously why places like Australia (I believe) had strict rules on who could do electrical work in the home long before we in the UK did.

Anyway, I don't do it now.

Dr B Van der Graff


Online themadhippy

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Re: Hmm, well, I've had better days.
« Reply #17 on: May 13, 2019, 01:27:54 PM »
Quote
The thing is, on a house, most consumer units have a 'trip' which protects you from stuff like
and if the electrical distribution companys hadnt been so tight  and used a proper neutral wire along with the 3 phases on there lines instead of using mother earth as the  return path we wouldnt need RCD's and the shock risk would be reduced.

Online weave

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Re: Hmm, well, I've had better days.
« Reply #18 on: May 13, 2019, 01:34:25 PM »
Hi Michael,

Sorry to sound like my mother used to but glad all's well. I'll have a party later with indoor fireworks to celebrate  :D

Cheers weave  :beers:


Online emjaybee

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Re: Hmm, well, I've had better days.
« Reply #19 on: May 13, 2019, 01:47:46 PM »
I always used to do my own electrics in my houses and flats - putting in extensions to ring mains and the like, but I was never happy doing plumbing.

Talking to a plumber, however, he said to me "if I get it wrong, someone gets wet - if a sparky gets it wrong, someone can die".

That's obviously why places like Australia (I believe) had strict rules on who could do electrical work in the home long before we in the UK did.

Anyway, I don't do it now.

Dr B Van der Graff

There are certain things I can and can't do in customers houses due to certification issues, so I only do 'minor works' these days, so I can't change a consumer until, despite 30 years experience, however an untrained home owner is perfectly fine to do it!

I've got relatives in Aus, your not allowed to do your own electrics, but you can buy all the stuff in DIY stores, and plenty seem to just do it anyway.

Quote
The thing is, on a house, most consumer units have a 'trip' which protects you from stuff like
and if the electrical distribution companys hadnt been so tight  and used a proper neutral wire along with the 3 phases on there lines instead of using mother earth as the  return path we wouldnt need RCD's and the shock risk would be reduced.

It would certainly help, your not wrong.

Hi Michael,

Sorry to sound like my mother used to but glad all's well. I'll have a party later with indoor fireworks to celebrate  :D

Cheers weave  :beers:


Don't eat all the hot dogs with your fireworks, the seasons not over yet.

 :D

It turns out that the wife does actually care about me, she wouldn't let me out of her sight yesterday when we got back, and even poked me awake in the night to make sure I was only asleep. Oddly enough I wasn't that impressed by that!

 ;D
Sometimes you bite the dog...

...sometimes the dog bites you!

----------------------------------------------------------

I can explain it to you...

...but I can't understand it for you.

Offline Newportnobby

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Re: Hmm, well, I've had better days.
« Reply #20 on: May 13, 2019, 01:57:16 PM »
Cripes, Michael :o 45000 volts :goggleeyes:
I think I'd be on a cloud playing my harp after that.

I admire your optimism Mick  :)

 :laughabovepost:
The trick is to drink plenty of Red Bull, Joe (other disgusting energy drinks are available)

Offline The Q

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Re: Hmm, well, I've had better days.
« Reply #21 on: May 13, 2019, 02:01:12 PM »
I've worked on HV up to 150,000 and current up to err um  effectively  unlimited. :goggleeyes: , even a few minutes ago I was working on 1000VDC, and in about an hour on 10 amps. Being careful is part of the job  being an Ex Radar now calibration technician.

 Years ago in the RAF we had a Station Warant Officer (= RSM in Army) who wouldn't accept that you had to work with a hand in your pocket standing on an unpolished rubber mat.  After creaping up behind someone and shouting "GET YOUR HAND OUT OF YOUR POCKET!!!" he got banned from all technical buildings unless accompanied by the Station Commander. The ban followed him to all futher stations as well..

Excuse me I have to record in the next measurement..
100ua DC through a 10k OHM Resistor (well 10000.165 Ohms)  and  the voltage result is .. 1.0000111 VDC

Online emjaybee

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Re: Hmm, well, I've had better days.
« Reply #22 on: May 13, 2019, 02:12:41 PM »
Cripes, Michael :o 45000 volts :goggleeyes:
I think I'd be on a cloud playing my harp after that.

I admire your optimism Mick  :)

 :laughabovepost:
The trick is to drink plenty of Red Bull, Joe (other disgusting energy drinks are available)

I suspect he was commenting on your delusion that you can play the harp!

 :D


Excuse me I have to record in the next measurement..
100ua DC through a 10k OHM Resistor (well 10000.165 Ohms)  and  the voltage result is .. 1.0000111 VDC

Oooo, you go steady!

Sometimes you bite the dog...

...sometimes the dog bites you!

----------------------------------------------------------

I can explain it to you...

...but I can't understand it for you.

Offline The Q

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Re: Hmm, well, I've had better days.
« Reply #23 on: May 13, 2019, 02:17:27 PM »
Cripes, Michael :o 45000 volts :goggleeyes:
I think I'd be on a cloud playing my harp after that.

I admire your optimism Mick  :)

 :laughabovepost:
The trick is to drink plenty of Red Bull, Joe (other disgusting energy drinks are available)

I suspect he was commenting on your delusion that you can play the harp!

 :D


Excuse me I have to record in the next measurement..
100ua DC through a 10k OHM Resistor (well 10000.165 Ohms)  and  the voltage result is .. 1.0000111 VDC

Oooo, you go steady!

I am..
I've measured 100uA , -100uA, 190uA, -190uA, 1mA, -1mA.
I've just turned on 1.9mA through a 1 kOhm resistor, steadily working my way up to 10 A through a 0.1 Ohm resistor..
« Last Edit: May 13, 2019, 02:19:47 PM by The Q »

Offline stevewalker

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Re: Hmm, well, I've had better days.
« Reply #24 on: May 13, 2019, 02:19:48 PM »
I always used to do my own electrics in my houses and flats - putting in extensions to ring mains and the like, but I was never happy doing plumbing.

Talking to a plumber, however, he said to me "if I get it wrong, someone gets wet - if a sparky gets it wrong, someone can die".

A local restaurant was being refurbished and someone broke in in the night, stealing all the copper piping. They didn't turn off the water and the high flow into the cellar undermined the partly refurbished building, causing it to collapse! Water can and does do a LOT of damage, while not many people are actually electrocuted. When part P was brought in, it was estimated that all the additional paperwork, regulations and 10s of millions of pounds a year would save up to 3 lives per year - but more than that were expected to die from house fires caused by electrics that people avoided upgrading because of the extra expense! Many of the restrictions of Part P have been rolled back these days anyway.

Online themadhippy

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Re: Hmm, well, I've had better days.
« Reply #25 on: May 13, 2019, 02:45:38 PM »
Dont you love part P.I used to regularly play with multiple 100kva + gen sets and  temporary  mains hook ups upto 400A,both indoor and outside,without any problems,however even though i was more qualified than most of the  council bods inspecting the work i wasnt allowed to change the light fitting in my toilet.Feels like those 5 years learning the trade properly were worthless.

Offline Skyline2uk

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Re: Hmm, well, I've had better days.
« Reply #26 on: May 13, 2019, 10:15:31 PM »
Wow

A cautionary tail indeed, glad all is ok now though.

Quote
I'm an apprentice trained electrician, and all these things were drummed into us. On household electrics I always meter before disconnect and after. Just because I've thrown a fuse/switch doesn't mean some chump hasn't wired it badly before. As a kid you stick your tongue on a PP3 for that 'tingle', four weeks into an electrical apprenticeship and I never did it again!

Mate, as you may recall, my current abode has given us some “interesting” times with leccy. Due to said clownishness, if it wasn’t for rubber handled screwdriver I would have had an almighty belt from a mains socket here...

Skyline2uk

 

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