Testing - practical exam coming up

[shocksl]

Hello good people

I haven't worked in the industry and I have DIY experience.

I am studying the course at York college.

I have a practical exam coming up. So i just want to get some practice in beforehand. Got a couple of months left yet.

I've made or should I say attempted to make a little sketch of the board will be.

The consumer unit will have RCD protection although this board doesn't seem to have it.

Can someone please kindly walk through how to do some of the tests. Especially on rlthe ring circuit.

Ofcourse once the safe isolation is done... I've turned off everything. Etc etc.

I'll perform the dead tests and then move onto live tests.

My idea is start off with continuity . Link
Cpc to live at breaker. Check all lightings etc sperarely switch lamp. Then move onto the heater .

Repeat with line and neutral.. how would i do the ring and bonding and the metal tray? ? Would it be long lead method?

Then once that's done. Move onto Insularion resistance at 500v. 3 tests on each circuit.

Then live and rcd. I've not really done this before. I'll need to read more on this one.

Any help would greatly be appreciated.

Thank you

 

[Jock from the north]

Is this a sketch of what your practical exam booth will be like or a simplified drawing of practice board

 

[shocksl]

Is this a sketch of what your practical exam booth will be like or a simplified drawing of practice board

Sketch of how the booth will be.

 

[Jock from the north]

Sketch of how the booth will be.

Is it purely testing or will there be faults introduced by your instructor for you to find

 

[shocksl]

Is it purely testing or will there be faults introduced by your instructor for you to find

First testing ..then fault finding at the end.

 

[Jock from the north]

Do you have a copy of the brown on site guide.it has the order of tests in there .I would imagine and be very surprised if your instructor didn't leave it open at the page on the test you were carrying out ,even though it might be a closed book exam.you will have a table at your booth with all your instruments, leads etc.

 

[Jock from the north]

First testing ..then fault finding at the end.

Is it the ring main testing that is bothering you most

 

[westward10]

Guidance Note 3 tells you all you need to know.

 

[Jock from the north]

Is it the ring main testing that is bothering you most

It will most probably be singles as apposed to twin and earth going to sockets and the on site guide only shows you twin and earth .so you will need to know your out going live /line at consumer unit and the returning neutral. These may be marked or numbered or may not be .don't be afraid to ask your instructor if this is the case .this would be in step 2 of ring continuity. If you have connected the correct pair your resistance between live /line and neutral at all your sockets will be roughly the same unless you test a spur on ring which will be higher .if you have connected the wrong pair at consumer unit/dist board your readings will increase and decrease along ring .

 

[Jock from the north]

Is this a sketch of what your practical exam booth will be like or a simplified drawing of practice board

As westward says referring to guidance note 3 rather than on site guide will tell you all you need to know.i would imagine a regs book ,osg,guidence note 3 ,electricity at work ,safe working practices etc will be made avalible to you on day of exam but can't say for sure .it should say on your exam guidance notes sent to you.

 

[westward10]

Have you not been shown the testing procedures?

 

[shocksl]

Thank you guys.

Well my test isn't till a couple of months yet. We haven't gone over it this year. We did last year. This year was all theory.

But I just wanted to get a little start and practice before.

 

[shocksl]

It will most probably be singles as apposed to twin and earth going to sockets and the on site guide only shows you twin and earth .so you will need to know your out going live /line at consumer unit and the returning neutral. These may be marked or numbered or may not be .don't be afraid to ask your instructor if this is the case .this would be in step 2 of ring continuity. If you have connected the correct pair your resistance between live /line and neutral at all your sockets will be roughly the same unless you test a spur on ring which will be higher .if you have connected the wrong pair at consumer unit/dist board your readings will increase and decrease along ring .

Yes this was throwing me off abit.

So in the consumer unit. I'm assuming there's going to be 2 links made?
Incoming line and outgoing neutral.
Outgoing line and incoming neutral.

For the ring circuit?

 

[westward10]

Do you have Guidance Note 3?

 

[shocksl]

Do you have Guidance Note 3?

I've got 2018 edition regs book. But not a sperate guidende note 3.

 

[westward10]

Guidance Note 3 has step by step guides to these tests.

 

[Admin]

Moved to courses forum.

 

[shocksl]

I live in a flat. It says its protected by and RCD.. but I can't see the button . I'm assuming it'll be in the main consumer unit for the block ?

Judging by just looking at CU opened . It seems the kitchen sockets and the general sockets have 2 seperate rings as they have 2 sets of lines and neutrals coming into the MCB. And correct me if I'm wrong the larger neutral wires coming into the back of the MCB from the RCD ???

I might do some continuity checks tomorrow.

 

[shocksl]

So I've been playing about with it today! Did some continuity on the ring

My results were for the ring circuit.
r1. 0.65
rn. 0.65
r2 1.06

Sockets. I was getting in the range of 0.31 ohms and 0.33. I had to open the sockets up to check with positive abd negative probe. I'm sure my tutor said I could use the plug that is supplied with my MFT 1720 tester. But that wouldn't do it. Kept getting great than 999 with that.. so hence why I opened it up.

r1 +rn /4 ..indicates the results may be ok?

However when I did the cpc and line check with the probes at the socket. I'm getting 0.71 ohms. Not sure if this is correct?

P.s I have the switches on position

 

[PS Electrics]

I live in a flat. It says its protected by and RCD.. but I can't see the button . I'm assuming it'll be in the main consumer unit for the block ?

Judging by just looking at CU opened . It seems the kitchen sockets and the general sockets have 2 seperate rings as they have 2 sets of lines and neutrals coming into the MCB. And correct me if I'm wrong the larger neutral wires coming into the back of the MCB from the RCD ???

Test button is at the bottom of the RCBO with the T on it