First Day of AM2 exam finished! Just need alittle bit of help.

[RyanF]

first day done of my AM2 exam. Just wanted to let people know what I done and if I will loose any marks.

So first of all risk assessment and safe isolation. I completed the risk assessment no problem at all and the safe isolation I completed fine as well asked for permission to isolate, prove, test, prove, lock off and warning notices, key in pocket etc.

Install section:-

Lighting cicuit took 1.5mm twin and earth L and Neutral and cpc to my first switch, fed the common with my L and Neutral in the back switch. I then took a 3 core 1.5 to the second swith which was grey as my neutral which went into the back of the wago, brown as my S/L with brown tape and the other brown as my other S/L. To the intermideate I then took the 3 core and looped the Grey in the back as a Neutral again, then took my brown and black to the top or the intermediate. Again, sleeved correctly. Another 3 core out to my last switch done the same again brown/ black S/L and neutral into another wago. Then, 1.5 up to the light as my neutral in the wago and the brown into th common. All cpc linked in wago is back of switch as well. MCB 6 Amp Type B

Ring Main

2.5mm and 1.5mm cpc from db to first socket, though to the spur, and to the last socket, last socket then back to the db. Then took 2.5 and 1.5 to the outdoor socket on the load side of the Switched spur. Ring on a 32 amp RCBO type B.

Bonding
10mm for water and seperate for gas.
Gas to first part of the pipe before the T joint.
Water connection just after the stopcock/ first section of pipe. Back to the db seperate and labeled.

Fb 200

Supply from DB to non switched spur. From
Non switched spur up to co2 alarm. A seperate length of FB 200 On cable tray using P clips and bolted to the tray. tighting of glands etc also on a Mcb 6 amp type B.

3 phase and neutral isolator. 4 core 2.5mm from db to isolator, again banjo and glanded at both ends. Used 1.5mm cpc as bonding cable inside db for the banjo. Then 2.5mm 3 phase colours and 1.5mm cpc to commando socket. Then looped neutral in back of isolator using a wago. 3 phase and earth connections.

3 phase dol starter

3 phase, neutral and cpc to dol starter.
Sy 3 core and earth to motor box. Glanded off and cable tied to cable tray. Marked 1 as L1 , 2 as the Black phase and 3 as the Grey phase.

S heating plan ill do tommorow along with thermal overload to work out of the motor and the data points. I still have 3 hours left.

Does all sound good? Or any hints or tips on things ive missed out?

Inspection and testing tommorow and fault finding

Cheers!

 

[RyanF]

There will be a N at all 3 switches in a wago I should imagine or some other connector.

Yeah thats what I done...

 

[RyanF]

So what I done is correct and not wrong?

 

[Strima]

So there’s a neutral at the intermediate switch? Which is pointless.
Am I reading that right?
Different from when I did it.
It was about 17 years ago mind

It’s to allow for smart switching. But TBH I would think it’s to check you actually follow the wiring diagram rather than just wade straight in.

Personally I think they should do one circuit this way and one using the three plate method.

 

[RyanF]

It’s to allow for smart switching. But TBH I would think it’s to check you actually follow the wiring diagram rather than just wade straight in.

Personally I think they should do one circuit this way and one using the three plate method.

We got told to loop the neutral in the back because some of the new switches have looped Neutral Terminals in the back of them now. Its also at a later date some new smart heating technology stuff needs a neutral at the switch. Hense why its been advised to do it this way.

 

[Strima]

So what I done is correct and not wrong?

That’ll work. Have fun wiring up the heating...

 

[RyanF]

That’ll work. Have fun wiring up the heating...

Im doing that tommorow along with the data point and tidying up cables/ checking conductors are correctly wired etc.

Ive got just under 3 hours left for the Install then onto inspection and testing.

Would I loose marks if using the wrong crimps on the cpc on the banjo to MET on the armoured? Etc.

 

[Strima]

If the wrongs crimps are provided then ask for the correct ones. If they say use what there is then just crack on.

Problem is the test centres are on a tight budget so they have to use what they can lay their hands on.

 

[RyanF]

If the wrongs crimps are provided then ask for the correct ones. If they say use what there is then just crack on.

Problem is the test centres are on a tight budget so they have to use what they can lay their hands on.

What ones would you use for a 1.5mm single cpc cable?
A red crimp?

 

[Strima]

What ones would you use for a 1.5mm single cpc cable?
A red crimp?

Red will work.

 

[Pete999]

Well ring final cicuit then....

Not trying to be a smart arse Ryan, but get the simple things right and the rest should follow a Ring Main is a distribution ring as in LV or HV distribution, I know ot was always referred to as a Ring Main but not anymore, Ring Final Circuit, as opposed to a Radial Final circuit. and good luck for tomorrow.

 

[Pete999]

Do you not take a mains from the DB to the first light switch then your s/live and neutral to the light wired from the first switch (which is a 2 way)containing your permanent live and neutral?
Any 2 way and intermediate switches then it’s just 3 core from your first switch to your intermediate then a 3 core from your intermediate switch to last 2 way switch.
Why carry a neutral all the way through?

Deleted

 

[Richard Burns]

No real knowledge of the actual spec but just a few thoughts on the description you have given.
Install section:-
Generally no problems there.
I am worried about the brown tape mention, I hope it was sleeving as you have said at all other points, tape would not be appropriate.
The wiring is correctly organised.

Ring Final
Sounds correct, when you say through to spur I assume you mean from first socket to fused spur and looped out again to the last socket, which is right.

Bonding
All sounds OK I assume the bonding clamps had the safety electrical….. labels on them and the clamps were firmly attached to the pipes and the bonding cables securely fixed to the clamps.

Fb 200
One I do not know: do you need to use fire resistant metal clips for the p clips and did you do so?
Other than that all OK.

3 phase and neutral isolator.

I would describe the cable from the banjo to the earth as an earth fly lead, do not use the word bonding in relation to this cable. Preferentially this cable would be a single core insulated cable. Does the isolator not have a neutral terminal to loop the neutral through, I am surprised you have to use a wago, though if there was no neutral terminal then this is fine.

3 phase dol starter
All sounds OK so long as you used the correct SY gland and not a compression gland.

Good luck with the heating, data and Inspection, testing, faults tomorrow

 

[Strima]

3 phase and neutral isolator.

I would describe the cable from the banjo to the earth as an earth fly lead, do not use the word bonding in relation to this cable. Preferentially this cable would be a single core insulated cable. Does the isolator not have a neutral terminal to loop the neutral through, I am surprised you have to use a wago, though if there was no neutral terminal then this is fine.

IIRC the fly lead is the CPC as they're using the armour as the CPC.

 

[Toneyz]

I may be wrong, but I think the OP has taken a L and N to the first switch on a 2 way switching circuit and has carried the N conductor through to the second switch and at the 2nd he will have a 3core, 2 strappers and a N at that switch where he will then run a 2 core and earth from the light, this cable will be a N and SL, again if I have read the post wrong then ignore this post.

Sounds like your right there Pete.

 

[RyanF]

IIRC the fly lead is the CPC as they're using the armour as the CPC.

With my testing and inspection tommorow do you know how to carry out a pefc and pscc test on a Megger Mft 1730? As I am unsure on what setting to set the tester to.