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166

General Discussion Area / Re: Leccy problem...

« on: 06 February 2017, 18:54:20 »

Glad to hear you are up and running again, Sods law the fault will return at the most inopportune moment, My next step would be to carry out an insulation resistance test but I know that not everyone has access to more specialist test equipment.

I have lost count of the number of testers I have bought and tested over the years. Some are even analogue

167

General Discussion Area / Re: Word Association.

« on: 06 February 2017, 18:37:24 »

Freedom

168

General Discussion Area / Re: Word Association.

« on: 05 February 2017, 15:49:04 »

Ambition

169

General Discussion Area / Re: Word Association.

« on: 05 February 2017, 15:22:05 »

Vacuum

170

General Discussion Area / Re: Word Association.

« on: 05 February 2017, 14:53:57 »

Atmosphere

171

General Discussion Area / Re: Word Association.

« on: 05 February 2017, 12:54:59 »

Rhubarb

172

General Car Chat / Re: Do I need help?

« on: 05 February 2017, 12:47:29 »

Seems a bargain, what's 75k to a gent of your means

173

General Car Chat / Re: Do I need help?

« on: 05 February 2017, 12:43:15 »

Camaro Z28 if I recall incorrectly correctly

174

General Discussion Area / Re: Leccy problem...

« on: 05 February 2017, 12:16:28 »

Before you do that TD have you got any fused spurs connected to the circuits?

Burglar alarm panels etc are often spurred off the ring main.

Just a thought before you start dismantling your house

175

General Car Chat / Re: Do I need help?

« on: 05 February 2017, 12:13:15 »

Get it bought lad you know you want to

LHD will be handy when you pop down to Cannes for a little winter sun and some local talent

176

General Discussion Area / Re: Word Association.

« on: 05 February 2017, 12:11:04 »

Dodgy

177

General Discussion Area / Re: Leccy problem...

« on: 05 February 2017, 12:08:25 »

Every day is a school day even for old dogs like me

Back when I started my apprenticeship in the seventies we never had circuit breakers never mind pesky RCD's

Everybody used to keep a card of fuse wire, usually from Woolies to rewire their fuses.

I was talking to a young pup (45) on site yesterday who can't remember a time before MCB's


Having an RCD as your main switch ( a requirement if your method of supply is aTT system) creates problems when one circuit causes a fault and puts the whole house in darkness.

One answer was split load boards with some circuits on the RCD and others not.

The best solution in my opinion is individual RCBO's which provide RCD protection and over current protection. Can be seen as too expensive

178

General Discussion Area / Re: Leccy problem...

« on: 05 February 2017, 11:45:26 »

Yes, STEMO, that is why I asked my earlier question. In most (all?) installations, the neutral feed is connected to earth at its entry point to the property. As such, I couldn't see why an E-to-N short circuit would cause a problem.   

Ron.

In a TN-S system which provides separate earth and neutral at the consumers premises (the earth and neutral are joined together at the supply transformer, this is a very common type of supply in the U.K.

In a TN-C-S (aka PME) system the earth and neutral and earth are joined together at several points between the supply transformer and the consumers premises but are separated at the cable head where it comes into the premises.

TN-C & TT systems are also used by supply authorities.

179

General Discussion Area / Re: Leccy problem...

« on: 05 February 2017, 11:38:40 »

What type of main switch do you have on your fuse board?

A neutral to earth fault won't trip an ordinary circuit breaker but the same fault will trip an RCD or an RCBO (RCBO is an RCD with overload protection combined)

Does the breaker that trips have a test button on it ?

Any chance of a picture of the board?

To all intents and purposes, neutral is earth.

Not to an R.C.D.

Neutral should be at earth potential but is not always the case

https://en.wikipedia.org/wiki/Residual-current_device

Hopefully this offers an explanation of how an R.C.D. works

180

General Discussion Area / Re: Leccy problem...

« on: 05 February 2017, 09:35:24 »

What type of main switch do you have on your fuse board?

A neutral to earth fault won't trip an ordinary circuit breaker but the same fault will trip an RCD or an RCBO (RCBO is an RCD with overload protection combined)

Does the breaker that trips have a test button on it ?

Any chance of a picture of the board?