Earth fault and open circuit

[daws124]

Could anyone explain a likely cause for each of those?

Is the cause of an open circuit and broken conductor? Help would be appreciated. Can't find any info on this :/

 

[Richard Burns]

But a longer cable has the capability to reduce the insulation resistance because of a larger surface area for leakage. Probably not overly significant over short distances and certainly the actual end to end resistance of the cores would increase.

 

[SirKit Breaker]

Tel has hit the nail on the head really.

If you Ins Res a circuit, you will get a good result even if there is a break in the circuit, as it will only test up to the point of the break.

So you carry out continuity, usually R1+R2 method, to confirm that the circuit is continuous.
If you are working on a ring, then you would follow this by doing Ring continuity.
Then you would IR the circuit.

Dead test completed.

Job done.

I would advise you get hold of IET Guidance note 3, it explains in simple to understand terms with illustration etc all things testing, and will pay for itself in no time. Even the experts and more experienced of us who do this day in and day out, and in my case i teach it, there isn't a week goes by where i don't need to refer to GN3, and I've been doing this all my life.

Cheers..........Howard

 

[telectrix]

true, howard. nobody can remember everything. what was the question, i forgot.

 

[Geordie Spark]

true, howard. nobody can remember everything. what was the question, i forgot.

Don't worry too much about it Tel ....... a bit of memory loss is to be expected at our age. :wheelchair::wheelchair:

 

[telectrix]

doc gave me some tablets for it, but i keep forgetting to take them. hmm, take what? my brain hurts.

 

[Geordie Spark]

doc gave me some tablets for it, but i keep forgetting to take them. hmm, take what? my brain hurts.

Aye .... it's a bugger ........ I spent the best part of two hours chasing Tidyboiler around the bedroom and when I finally caught her I couldn't remember why I had been chasing her.

 

[tidyboiler]

Aye .... it's a bugger ........ I spent the best part of two hours chasing Tidyboiler around the bedroom and when I finally caught her I couldn't remember why I had been chasing her.

Come upstairs, and I'll remind you.......... :smilewinkgrin:

 

[Silly Sausage]

I don't believe he could chase for 2 hours. 2 minutes maybe...:smilielol5:

 

[Geordie Spark]

I don't believe he could chase for 2 hours. 2 minutes maybe...:smilielol5:

My Zimmer frame has just been serviced .....

 

[telectrix]

but has TB been serviced, that is the question.

 

[Silly Sausage]

He never caught her!

 

[Geordie Spark]

He never caught her!

I did ................ but only after she accidentally stepped in the gazunder and got her foot stuck in it.

 

[telectrix]

hope it was empty at the time. otherwise would give a whole new meaning to golden rain.

 

[tidyboiler]

hope it was empty at the time. otherwise would give a whole new meaning to golden rain.

I've seen the video! :rockon2:

 

[Geordie Spark]

I've seen the video! :rockon2:

Seen it ... you bloody starred in it !!!!!