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WIRING DIAGRAMS FOR LIGHTING CIRCUITS.


 
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FAQ

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PostPosted: Wed May 05, 2010 5:08 am Reply with quote

PLEASE NOTE (Thanks to SecureSpark)

Before changing a light fitting or switch (or any other accessory for that matter), please do what you can to document the existing connections to that equipment. Take photo's and write down which wires are connected to which terminals on the accessory or light fitting.

Especially, do NOT assume black-sheathed conductors are neutrals!

A classic DIY mistake is to take down a correctly connected light fitting with more than one cable connected to it then wire up the new one with all reds to the live terminal and all blacks to the neutral (Not forgetting the earth terminal to the cpc's, where present).

When the circuit is re-energised, it is discovered that the light is on with the switch(es) in the "OFF" position(s). When the (one) switch is switched to the other position, the circuit protective device opens, as there is now a short circuit between live and neutral.

Additionally, there may well be three core cables connected to extractor fans etc...Do not assume certain colours must be lives and others neutrals.

Also, this sounds a little obvious, but if the wiring is not faulty and the accessory or light fitting is working, please ensure it is reconnected in the same manner as before.


1) SINGLE WAY LIGHT VIA A JUNCTION BOX

Click image to enlarge
NOTE-
If a metal light switch is used, connect the earth wire to the earth terminal on the light switch and loop to the back box.

Using a switch wire with twin red + earth:

(Click on image to open)

Harmonized (Brown / Blue):

(Click on image to open)

Harmonized with twin brown + earth switch wire:

(Click on image to open)
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The following 4 users say thank you to FAQ for this useful post:
Jamesymoon (10 Apr), jc69817 (21 Dec 2012), RexT (7 Aug 2011), Tempiz (9 Nov 2010)
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FAQ

from United Kingdom

Joined: 16 Apr 2009
Posts: 63
Location: West Midlands,
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PostPosted: Wed May 05, 2010 5:09 am Reply with quote

2) LIGHTING USING CHOCK BLOCK OLD COLOURS

1 way lighting using chock block:

Click image to enlarge

2 way lighting using chock block:

Click image to enlarge

2 way intermediate using chock block:

Click image to enlarge
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FAQ

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PostPosted: Wed May 05, 2010 5:24 am Reply with quote

3) 2 way switching.

Converting from 2 independently switched lights



OLD STYLE 2 WAY SWITCHING

This method should only be used if the lights are on the same circuit but it's not that uncommon to see it done between circuits!

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FAQ

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PostPosted: Wed May 05, 2010 5:24 am Reply with quote

4) ADDING A THIRD SWITCH TO A 2 WAY SYSTEM.

You don't need to understand the workings of the existing 2 way system, you just have to remember that the combination of a 2 way switch and an intermediate switch act like a 2 way switch that can be controlled from 2 places.

Follow this diagram

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FAQ

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PostPosted: Wed May 05, 2010 5:25 am Reply with quote

5) 1-WAY & 2-WAY SWITCHES


Click image to enlarge


Never bother buying 1-way switches - 2-ways will do the same job, and can be upgraded if you need to in the future.

2 GANG 2 WAY SWITCH
2 gang switch layout
2 gang switch layout


This is the back of a 2 gang 2 way switch.

It is 2 switches on the back of the same switch plate, one being up side down in relation to the other. Each switch must use C and L1 or all 3. The dividing line shows which is which half.
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FAQ

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PostPosted: Wed May 05, 2010 5:25 am Reply with quote

6) MORE SWITCHING METHODS

NOTE :Don't be confused if a different colour goes to a different terminal. Often Red is used as "Common" & Blue & Yellow as strappers (L1 & L2).


Click image to enlarge


Click image to enlarge
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FAQ

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PostPosted: Wed May 05, 2010 5:25 am Reply with quote

7) WIRING DIAGRAMS

Here are some colour variations on the choc block connection method.


Click image to enlarge


Click image to enlarge

This is a multi switch setup. You can fit as many intermediate switches as you like.


Click image to enlarge
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FAQ

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PostPosted: Wed May 05, 2010 6:00 am Reply with quote

8 ) LIGHTING USING A JUNCTION BOX HARMONIZED COLOURS

1 way lighting using junction box:

Click image to enlarge

2 way lighting using junction box

Click image to enlarge

2 way intermediate using junction box:

Click image to enlarge
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FAQ

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PostPosted: Wed May 05, 2010 6:03 am Reply with quote

9 ) HOW TO SPUR OFF A SOCKETS RING CIRCUIT


Click image to enlarge

Thanks To RF Lighting
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FAQ

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PostPosted: Wed May 05, 2010 6:50 pm Reply with quote

10) CEILING ROSE HARMONIZED WIRING

If a metal light switch is used, connect the earth wire to the earth terminal on the light switch and loop to the back box.

It is possible to place more than one intermediate switch on the cable between both of the two way switches making more switch points. All the intermediate switches are wired in the same configuration.

Chock block must be enclosed in fitting or in a suitable enclosure above ceiling and not exposed to heat from the lamp.

Harmonized Colour Scheme Diagrams

Single way loop in ceiling rose:

Click image to enlarge

Two way with loop in ceiling rose:

Click image to enlarge

Two way intermediate with loop in ceiling rose:

Click image to enlarge
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FAQ

from United Kingdom

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Location: West Midlands,
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PostPosted: Wed May 05, 2010 6:50 pm Reply with quote

11) LIGHTING USING CHOCK BLOCK HARMONIZED

Single way lighting using chock block, courtesy of RF Lighting:

Click image to enlarge

Two way lighting using chock block:

Click image to enlarge

Two way intermediate using chock block:

Click image to enlarge
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FAQ

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PostPosted: Wed May 05, 2010 6:50 pm Reply with quote

How to add a P.I.R. with floodlight.

Connecting to the ring main (socket circuit)

Cables used from the JB to the F.C.U must be the same size as the existing cable (2.5mm) You must then put a 3A fuse in the F.C.U.

Connecting to a lighting circuit, the F.C.U can be a switch instead

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above uses all old colours

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above uses old and new colours
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securespark

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PostPosted: Wed Jul 27, 2011 1:35 am Reply with quote

Thanks to 1550:

A useful pdf detailing regulations governing the installation of SELV lighting.

1550 wrote:
from Hager
http://download.hager.com/hagergroup.co.uk/files_download/Ashley_Product_Information/low_lighting_requirements.pdf
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bernardgreen

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PostPosted: Sun Oct 16, 2011 6:15 am Reply with quote

An alternative way to wire a two way light circuit which is convenient for wall lamps with a switch in or below the lamp.


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Posted: Thu Jul 26, 2012 3:24 pm    Comment:

Please add new infomation to the Wiki. This will be moved into the Wiki in due course:
http://www.diynot.com/wiki/electrics:lighting
 
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