AM2 Lighting

YoungBart · May 11, 2013

Hi all, I do apologise if this has been posted before, But I'll be damned If I can find it. I have my AM2 this week, and I'm fairly confident In all aspects of it (Famous last words). But I've just hit a snag while trying to work out the lighting.
Apparently the circuit is a 2 way and intermediate, wired in 1.5 t&e, with the feed going to the switch. (I can manage that bit)
and the strappers and switch wire are all ok, But what about the Neutral, I've just seen somewhere that says I need another legnth of cable between the first 2 way switch and the last 2 way switch with the Brown unused (in a connector) and the neutral Joining up with the feed Neutral and the Neutral from the light (again in connectors).
Anyway I've done a quick diagram (of sorts) does it look ok to you (from a technical point of view NOT artistically)

murray2707 · May 11, 2013

How about feed and neutral into first switch, switch and neutral back to light from first switch. Then just a 3core t&e from first switch, with com joint through in intermediate switch to your last switch.

Guest55 · May 11, 2013

im afraid your wiring layout is completely wrong young man.

it can be done using just a single 3 core & earth cable which will carry the neutral through the switches and onto the light.
the problem is you've taken the permanent live ( brown ) to all the switches when it should go no further than the common terminal in switch 1

it should be like above but with the neutral going through the switches on its way to the light.

trebor · May 11, 2013

I would say you have been looking at the ----------- website which is probably the cause of so many failures, take note of murray2707, far more accurate

YoungBart · May 11, 2013

Murray, I'm fairly sure the spec for the AM2 says the feed into one switch and the switch wire out of another switch, So unfortunately that is not an option. Biff I tried to draw my diagram using the info, from sparky facts (As trebor has said) website, And upon further investigation I have misread it, and shouldn't have continued my brown feed.

trebor · May 11, 2013

The spec says I can assure you 150% the feed from the db to sw1 next to the db, a 3 core and earth from sw1 via the intermediate to sw 3, the twin and eaearth fom the light back to switch 1, hence you will have two twin and earths in the first switch, screwless connectors must be used to marshall the neutrals and cpc`s, the common in the intermediate and also the lone cpc in switch 3, eg wagos

YoungBart · May 11, 2013

Thanks Trebor, I've evidently been fed duff information from the 'Sparky Facts' I've been focusing that much on the S plan that the Lighting has falled down the pecking order

trebor · May 11, 2013

youre welcome, by the way the common is grey, and dont forget to brown sleeve the grey and black in all switches

KAS1 · May 11, 2013

How about loop in loop out system, T&E down to SW1 3c&E SW1-SW2 and 3c&E SW2-SW3 all done without the need for N at switch in this case as not necessary

murray2707 said:
How about feed and neutral into first switch, switch and neutral back to light from first switch. Then just a 3core t&e from first switch, with com joint through in intermediate switch to your last switch.

Guest55 · May 11, 2013

KAS1 said:
How about loop in loop out system, T&E down to SW1 3c&E SW1-SW2 and 3c&E SW2-SW3 all done without the need for N at switch in this case as not necessary

its a requirement of the am2 exam to do it a particular way KAS , they wont have option to choose the 3 or so different ways of wiring the circuit.

Garythenab · May 13, 2013

biff55 said:
im afraid your wiring layout is completely wrong young man.

it can be done using just a single 3 core & earth cable which will carry the neutral through the switches and onto the light.
the problem is you've taken the permanent live ( brown ) to all the switches when it should go no further than the common terminal in switch 1

View attachment 18975

it should be like above but with the neutral going through the switches on its way to the light.

Yep agree with with that. Thats how it was done when i done it 1 1/2 years ago

YoungBart · May 14, 2013

Ok, So a day to go and my nerves are rattling like crazy, I can barely hold my glass of scotch lol. I've got these 2 methods for my lighting, Can anyone tell me if they are both correct (They should all be functional) and wich of the two methods is best.

Guest55 · May 14, 2013

no 1 is correct , no 2 isnt.

KAS1 · May 14, 2013

If you draw the switch positions in, as in biff's drawing you'll be able to follow the diagram and determine as to why the switching works or doesn't, it's the easiest way.

YoungBart · May 14, 2013

The 2nd method is just what I could decipher from a message a friend sent me, so possibly he's got confused or I've missed a point a copy of the message 'the feed in goes in the bottom of switch (L1) and the feed to the light from (L2) of same switch then strappers as normal between switches terminal block on common at intermediate tho I think your way works aswell there is no need for the connector in the first switch you just make use of the switch terminals instead if u do it my way plus that's how I did it and I passed...eventually!! '

I can see now with the switching paths that it won't work.
Just wondering if my 1st method will be ok with it having 2 connectors at the first switch (Neutral, SL+C, CPC)

AM2 Lighting

YoungBart

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murray2707

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Guest55

trebor

YoungBart

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trebor

YoungBart

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trebor

KAS1

Guest55

Garythenab

YoungBart

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Guest55

KAS1

YoungBart

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