Fault finding

[Floody]

There's no lighting circuit.

2 power, 1 shower and 1 cooker. So maybe the lighting is accidentally connected to a MCB that's already in use?

I can't think how 1 room would be lit without the rest tho. I'm still working on that. Half way there?

 

[trev]

No mention of a cooker in the question mate, it might be an acceptable assumption to make that C4 is the lighting. Work with what you know not what you expect

 

[High Tower]

James,

keep going mate you will figure it out!

 

[Floody]

Guys I've read it totally wrong. Where the hell did I get cooker from?????????? Idiot!! Let me have a think ill be straight back lol

 

[Floody]

Ok, my next effort at the answer.

weve got 4 circuits

shower
power1
power2
lighting

lighting off in all rooms apart from 1. Possibly the live out from the dining room rose?


or Ill take a stab at a crossed/dropped neutral

 

[Floody]

I really want to say that's its a problem at the cu but I don't know how the dining room would be lit if that was the case. So ill stick with my answer, although its similar to Bakers. Problem with live/neutral coming out of the dining room rose into the second rose.

 

[Paul.M]

Problem with live/neutral coming out of the dining room rose into the second rose.

Ask yourselves this:- How can the first light on this circuit be working fine and the rest of the house (only one lighting circuit) not have any power to them? What would happen if there was a break in the loop in loop out from the first rose?

 

[Baker1988]

Ask yourselves this:- How can the first light on this circuit be working fine and the rest of the house (only one lighting circuit) not have any power to them? What would happen if there was a break in the loop in loop out from the first rose?

That is what we are saying the first light has both live and neutral so it works fine but the second light is not working so it has a problem/break with either live or neutral from the first light to the second so do a quick continuity test between lights this will show if they are continuously connected which more then likey they will not be

 

[Floody]

Baker im thinking exactly the same as you pal. But someone is going to fly out with the answer and its gonna be simple ... And ill be like..'doh' lol

 

[Baker1988]

Baker im thinking exactly the same as you pal. But someone is going to fly out with the answer and its gonna be simple ... And ill be like..'doh' lol

Lol yeah more then likely will be something completely different and simple like they have connected the first light from the sockets and fused it down or there are 2 different lighting circuits in the same mcb or something like that

 

[Paul.M]

No lads, you have both danced around the answer and only now you have hit the nail on the head. It will be lost of continuity on the Line or Neutral from rose 1 to rose 2. This is how I would test in the real world BUT please dont do this in college or on any form of testing exams you do, YOU do all test whilst the circuit in isolated, locked off and sign hung up.

Go to the cu and switch off all over circuits and see if the living room light still works, hence making sure it is on the lighting circuit. It is (I assume)

Go to the 2nd rose and test Live to Neutral then Live to CPC. This will tell you which leg is broken. Lets assume its the Neutral.

Power off at the mcb. Test for dead at 1st rose, check terminations on the neutral and all the others whilst your there. If terminations are fine now do an end to end test using long leads from rose 1 to rose 2 one conductor at a time. If you dont have long leads connect L + N together at one end and test at the other, do the same for L + CPC and N + CPC.

Now you have found the broken Neutral fault in the ceiling, we now have to repair or rewire that leg.

Well done lads, just do all your testing dead. I do it live just to save a bit of time on site but dont you do it in college, you will get an automatic fail.

 

[Floody]

I bloody said that on post #21

its been annoying 50 shades of grey out of me alllllll nite because I just couldn't think of anyway else that rose 2 wouldn't be live, unless there was a problem with the loop terminal in rose 2 and it needed a new rose..... But I was hardly going to say that lolol


anyway thank god that's cleared up, I can go to Austria Sunday with my head held high


we need more of these Q's up tho

 

[Paul.M]

It may not need a new rose. There is really only 3 things that could be wrong on this fault finding mission.

1. Loose or broken termination for the out going loop in rose 1.

2. Loose or broken termination for the in coming loop in rose 2.

3. Damaged/broken or burnt out conductor in bertween the two roses.

Its difficult to put down in words on here and paint the picture so to say but we all did well. I'll see if I can post up another one for tonight.


Just thought of another thing it could be.

4. Only the lamp in the living room works and all the other lamps throughout the house have blown and need replacing lol. Dont think that would ever happen but it is a remote possibility (not)

 

[Baker1988]

I bloody said that on post #21

its been annoying 50 shades of grey out of me alllllll nite because I just couldn't think of anyway else that rose 2 wouldn't be live, unless there was a problem with the loop terminal in rose 2 and it needed a new rose..... But I was hardly going to say that lolol


anyway thank god that's cleared up, I can go to Austria Sunday with my head held high


we need more of these Q's up tho

yeah i totally agree the more questions like this the better!!

 

[Baker1988]

Just thought of another thing it could be.

4. Only the lamp in the living room works and all the other lamps throughout the house have blown and need replacing lol. Dont think that would ever happen but it is a remote possibility (not)

haha i actually thought that as well but didn't put it as what are the odds really haha