end to end high resistance

[Nicky Tesla]

That`s fine, as long as you don`t accidentally plug into a socket which isn`t on the ring - cue large bang, expensive meter repair & possible injury.

If you follow your own logic, the O/P could end up taking off a socket and getting a belt when touching the lives if he accidentally removes "a socket which isn't on the ring""cue large bang expensive meter repair & possible injury"

That sounds "Downright Dangerous" to me

Come on! Lets at least assume he is a little competent...Jeez!!!

When used as is intended it can save a lot of time, look outside the box for once in your life.

 

[Nicky Tesla]

I`ve known someone who was killed by a lead like the one you describe.It had been made, for whatever reason (he had it when I first met him). Working in an HMO type property; where the token meter was out of credit, so he connected it between the bedsit in question & next door.

The painter & decorator unplugged it, to plug something else in.........

The painter and decorator didn`t survive.

So maybe I`m a little over-sensitive on this issue; but, experience says that if you make up a lead liker the one you describe, you`ll use it, in situations like the one above.....its human nature.

If you haven`t got one, you won`t. Simple as.

I don`t want to hear of anyone else being killed as a result of "short-cut" tricks & tips; and I don`t suppose anyone on the forum wants to test out the culpability protection engendered by the forum.

KME

People have been electrocuted from machine leads that people have cut off something to save the plug...so wot....nowt to do with this discussion.

Heres a tip, after youve used the test lead, make it safe! pull out both fuses or something, put it in a glass box labeled "break only in case of emergency" whatever.

 

[Nicky Tesla]

I once had to move a fish tank and put the fish in the bath, move huge livingroom units etc to check out sockets exactly like the O/P has said. The sockets were accessible, just, but not accessible enough to take off and test.

Wish I had come up with my idea earlier it would have saved me a lot of bother.

The cause ended up being a nail banged into the wall high above a socket to hang a feather decoration.

 

[Sidewinder]

I know a very good very experienced electrician who once had a very severe electric shock. Spent 4 days in hospital following the incident, quite bad burns. How? A widow maker that

 

[tom1]

You would not need to do do that if you tried my suggestion did you not fancy it? your a distinguished member, so likely to be competent? or do you not understand how you use the test lead? Will help if req.

i have not been back since i started the thread mate, going back on monday.

i see how you idear works mate and its advantages but also the dangers

 

[Nicky Tesla]

Many people have been electrocuted for doing all sorts of simple electrical tasks cos they are not competent. Anyway i respect your reasons not to use my idea, but like i said not for DIYers, only competent people allowed, so il bow out

 

[Andy™]

like Nicky, i have plenty of leads with bare ends etc for testing/fault finding purposes. in the wrong hands, yes they can be dangerous, but used correctly they are safe.

 

[tom1]

well its about sorted now thanks everyone, it was between the cu and first socket, so will have to be a radial just need a MEM b20.

thanks again

 

[Andy™]

if the ring / now radial feeds kitchen and other rooms, you may have a problem with nuisence tripping

 

[tom1]

[quote name='Andy

 

[tom1]

just looking at this more closely unless i am wrong

R1+R2 0.8,

2.5mm twin & earth

so length of circuit 0.8x1000/19.51 = 41m

volt drop

20A mcb x 40m x 18/ 1000 = 14.4

radial 5% volt drop.

230v = 11.5 v

it actually measured at 240 v but even thats 12v

so unless i am way off here the circuit is too long for a 20 amp mcb?

 

[kme]

just looking at this more closely unless i am wrongR1+R2 0.8,

2.5mm twin & earth

so length of circuit 0.8x1000/19.51 = 41m

volt drop

20A mcb x 40m x 18/ 1000 = 14.4

radial 5% volt drop.

230v = 11.5 v

it actually measured at 240 v but even thats 12v

so unless i am way off here the circuit is too long for a 20 amp mcb?

Think the "18" is your problem......

Should be the mV/A/M figure from the BRB; which, from memory, is <18

Though I may be wrong??

KME

 

[tom1]

Think the "18" is your problem......Should be the mV/A/M figure from the BRB; which, from memory, is <18

Though I may be wrong??

KME

unless i am looking at the wrong table its 18 mate, which buggers me up a bit

 

[a1]

What table are you looking at, Tom?

 

[tom1]

6f pg 134 osg

or 4d5 pg 282 brb

 

[Sidewinder]

tom1,

I'm not going into your end of cct calc here, which may or may not be correct, however, that does not allow for any current being drawn prior to the end of circuit.

I intimated in a suggestion with regard to ring circuits in a post recently and the same applies to radials to a certain extent, for example the volt drop will increase at the extremity of the circuit if any current is drawn on the way!

 

[tom1]

tom1,I'm not going into your end of cct calc here, which may or may not be correct, however, that does not allow for any current being drawn prior to the end of circuit.I intimated in a suggestion with regard to ring circuits in a post recently and the same applies to radials to a certain extent, for example the volt drop will increase at the extremity of the circuit if any current is drawn on the way!

i thought the volt drop calc was worst case for a 20A mcb (although it is posible that >20 may be drawn for a period of time)

 

[Sidewinder]

yes tom1 you are not incorrect, but you are making the assumption in your calc that all of the current is being drawn at the physical extremity of the circuit.

Is this valid?

 

[tom1]

yes tom1 you are not incorrect, but you are making the assumption in your calc that all of the current is being drawn at the physical extremity of the circuit.Is this valid?

no its not mate, in fact the least current is being drawn at the final socket.

the high drain appliances are near the start of the circuit

 

[Sidewinder]

tom1, how can you be sure, things can move this is one of the problems when you are designing socket outlet circuits.

So, have you allowed for the current draw of the large appliances at the start of the circuit and how this will affect downstream calculations?