Friday morning stupidity,nearly didn't make lunch time!

[Deleted member 9648]

Carrying out a few minor remedials following an EICR on a small rented cottage this morning. One item was to replace the immersion heater stat for one with a thermal cut out. Switched off DP isolator alongside the tank, check with probes, crack on. Only trouble was the airing cupboard was a bit of a squeeze, and in manoeuvring around to get better access I managed to knock the switch back on with my elbow while having the live conductor in my other hand. Wrist in contact with the copper hot pipe on the top of the tank I got one hell of a poke, didn't half 'effin hurt. Had to have a bit of a sit down and contemplate, was working alone in an empty cottage, could have been the last EICR I ever done.
That's how it happens boys and girls, safe isolation every time with a moments thought for the unexpected before diving in. Lesson learnt....well 'till the next time anyway.
On another note, was a TT system with an Ra of 260 ohms, earth rod was in good condition with a 16.0mm main earth lead properly lugged to the rod.
I didn't code it because....
It complies with Bs 7671, which does not give a max value of Ra, the 200 ohms mentioned is only mentioned as possibly being unstable when nowhere in Bs 7671 does it actually state the Ra must be stable. A max Zs of 1667 ohms is permitted, so in theory an Ra of Ra minus max R1+R2 value would comply with Bs7671.
I did note that an improvement would be beneficial but no code.
I've no intention of debating this as I'm immovable on it and have argued the case before on here.
Just interested in what code, if any, others might apply.

 

[buzzlightyear]

code 1 for not making it safe for your self . was you life flashing before you .

 

[Risteard]

Stability is important because you may find what it is now is not what it is in future. That said, as you point out it does comply with BS7671. I think a comment without any code is the right approach actually, so well done. Pat yourself on the back.

 

[Pete999]

Carrying out a few minor remedials following an EICR on a small rented cottage this morning. One item was to replace the immersion heater stat for one with a thermal cut out. Switched off DP isolator alongside the tank, check with probes, crack on. Only trouble was the airing cupboard was a bit of a squeeze, and in manoeuvring around to get better access I managed to knock the switch back on with my elbow while having the live conductor in my other hand. Wrist in contact with the copper hot pipe on the top of the tank I got one hell of a poke, didn't half 'effin hurt. Had to have a bit of a sit down and contemplate, was working alone in an empty cottage, could have been the last EICR I ever done.
That's how it happens boys and girls, safe isolation every time with a moments thought for the unexpected before diving in. Lesson learnt....well 'till the next time anyway.
On another note, was a TT system with an Ra of 260 ohms, earth rod was in good condition with a 16.0mm main earth lead properly lugged to the rod.
I didn't code it because....
It complies with Bs 7671, which does not give a max value of Ra, the 200 ohms mentioned is only mentioned as possibly being unstable when nowhere in Bs 7671 does it actually state the Ra must be stable. A max Zs of 1667 ohms is permitted, so in theory an Ra of Ra minus max R1+R2 value would comply with Bs7671.
I did note that an improvement would be beneficial but no code.
I've no intention of debating this as I'm immovable on it and have argued the case before on here.
Just interested in what code, if any, others might apply.

Tut Tut Mate should have followed the Safe isolation Procedure, stand in the corner till I tell you to sit back down.

 

[uksrevivor]

A momentary lapse of reason
I bet it did bloody hurt as well lol

 

[Andy78]

code 1 for not making it safe for your self . was you life flashing before you .

No, the pipework and his fingers were

 

[buzzlightyear]

so that's one of the bucket list !

 

[Zdb]

Lay off the cream cakes and it might not be as much of a tight squeeze.

 

[LankyWill]

I did something similar a couple of years back, told a fellow spark to turn the mcb off and guard it. He walked off and somebody turned it back on, had a each live of a ring in my hand. Got one hell of a bloody shock, I ended up sacking the day off and went to A&E for an ECG, certainly made me wise up to locking off. Hope your alright and don’t be too hard on yourself, ---- happens.

 

[Squid]

Its only a tingle......

 

[Marvo]

.....I managed to knock the switch back on with my elbow while having the live conductor in my other hand. Wrist in contact with the copper hot pipe on the top of the tank I got one hell of a poke, didn't half 'effin hurt.
Just interested in what code, if any, others might apply.

Sorry to hear you got a nasty whack. We're all guilty of cutting a corner or two so a reminder now and then of the possible consequenses is a good thing.

.......It complies with Bs 7671, which does not give a max value of Ra, the 200 ohms mentioned is only mentioned as possibly being unstable when nowhere in Bs 7671 does it actually state the Ra must be stable. A max Zs of 1667 ohms is permitted, so in theory an Ra of Ra minus max R1+R2 value would comply with Bs7671.
I did note that an improvement would be beneficial but no code.
I've no intention of debating this as I'm immovable on it and have argued the case before on here.

By your reasoning above a C3 surely?

I've never looked at the regs as being the pinnacle of quality you should work to, more as them being the absolute bare minimum standard required. An earth impedance of several hundred ohms is grossly inadequate for noise suppressors and surge arrestors in any modern day power supplies or drivers. It would cause havoc with powerline ethernet adaptors and even poor quality sound from TV's and hi-fi's. Because of this I'd also inform the customer that whilst a better earth impedance isn't required by the regs it would be highly advisable to improve it because of a high liklihood of numerous future problems in other areas.

 

[pirate]

Ouch! Glad you are ok to post your story on here...
I read on another thread on here today about isolation, L-N, L-E,N-E and MCB in wrong phase...and how a silly voltage pen can be a lifesaver...
See plumbers, by the way? You get wet when they f**k up...but you don't die! Or actually, when they really f**k up, they can cause some hazards...just keep away from their installations where they combine electricity and water in close proximity...and test everything...
this from an amateur who survived 50 years with a neon screwdriver!

 

[The Ghost]

I am sorry to hear of that. A very sobering experience no doubt. Could have been the unthinkable! Glad to hear you have survived such. Have you considered getting a check up? Harm can be caused which may not be apparent. Not trying to rustle up scare stories just that it may be possible to damage sensitive tissues around the heart and so on, maybe nothing but....

 

[GeorgeCooke]

So there was no RCD anywhere?

 

[GeorgeCooke]

It would cause havoc with powerline on ethernet adaptors

Nasty bad technology that should never be used anyway.