wiring help required

[Mwoods4757]

i was trying to install 2 switched fused conenection units on a ring circuit. at the start of the job i cut through a live wire which tripped the whole db. i connected the fcus ok. then put a socket plate on another one which had been wired ready. when i turned the board on the socket with the fcus has no power anymore this is the one which i origanlly cut through and the new socket has power but every time i test between earth it trips the whole board again... anoyone any ideas?

 

[Mwoods4757]

live and earth is fine and has 230 there then you touch earth it trips.

 

[Mwoods4757]

live and neutral is fine sorry

 

[Mwoods4757]

yes peterdaniels it is on a rcd

 

[Guest112]

using voltage testers you should test between line and neutral first for say five seconds and then between line-cpc it apparently doesnt trip then because the testers are "charged" or something like that

 

[Golden_Boy]

yes i do but noet even that.. just a fluke voltage tester. when i go between earth and anything it wil trip it..

Is it a dedicated volt stick or a MFT or a multimeter of some sort. Lets have the model and then it may be possible to help. However it sounds like you need a professional ...

 

[wallyanker]

It will trip as you are causing an imbalance. Live to neutral you are at 0 potential so it will not trip.

 

[Mwoods4757]

that it was im am doing and always putting the tester on neutral first, or cpc first then earth but to no avail.charged or not it just trips it out on the upstairs ring and downstairs ring. so i would think there was already a earth fault on there somehow and now just as i have worked on it, it has showed up?

 

[JONOXNAM]

I shudder when I hear stuff like 'but im not sure' -

Safe isolation to begin! then if you have a ring main you should have done end to end tests on your live and earth conductors, if your ring is open any further loading with an inappropriate protective device could be very dangerous, I presume you have some test equipment to perform the minimum continuity and insulation tests etc etc required by the reqs? also is this circuit feeding a special location if so you should have informed your building control before starting work...unless you are a member of a part p body (napit nic etc)..... I could go on and on but if you have any questions about the couple of points I have raised get a proper sparky in! at a minimum you should be certifying this work as it is a circuit addition and not an accessory replacement!

If you are in the Plymouth area I would be happy to drop by free of charge...

Jon.

 

[Mwoods4757]

its a fluke t100

 

[Mwoods4757]

thanks jon i know all that how ever its just at home

 

[Mwoods4757]

also im in the midlands very kind of you though

 

[Mad Spark]

Get a spark in to check your problem. where are you based?
I had a similar problem once where the kitchen ring kept tripping out, you would power it up and after an hour or maybe more the ring would trip out again, even on no load. After numerous hours of head scrachting and head banging I sorted the problem. Oh yes the similarity, lol, was that when I tested between live and neutral I also got 230v however between live and earth the rcd would trip out. Turned out to be a loose neutral, and I am more then certain its the same issue here.
Anyway good luck, and don't do it yourself call someone in the know, you have allready had a narrow escape, dont tempt fate.

 

[Specialist]

well yes i know patto but i dont see how it could have been live. i think it must have tripepd at the same time

Yes it will, for the simple reason that you've only isolated 1 pole. i.e the Live & then made a Neutral / Earth circuit when you cut the wire.

 

[Specialist]

yes i do but noet even that.. just a fluke voltage tester. when i go between earth and anything it wil trip it..

A lot of 2 pole testers will do this when you test L / E as they are low impedance testers. If you don't know this then you should'nt be useing it to test Electricity.

 

[Mad Spark]

I'm from birmingham Matt if any good to you, Pm me and I'll see what I can do