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Old 12-08-2007, 04:01 AM   #1
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Confirming light switch wiring


Hi all,
I am upgrading a Tenby lightswitch to a Marbo dimmer single 2way 400W and would like confirmation of how to wire up the new dimmer. The light is 3x60W (dimmable) so the 400W is certainly within spec.


reverse view of existing light switch


Reverse view of new dimmer

Please can you confirm what goes where?

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Old 12-08-2007, 06:48 AM   #2
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Confirming light switch wiring


If you are in the UK, and I suspect you are, please note that in your post. This site is monitored predominately by US electricians and DIYers.

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Old 12-08-2007, 12:35 PM   #3
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Confirming light switch wiring


The far right with the ac symbol and arrow is your common and the others (L1 L2) is the 'dimmed' hots going to the lights. Your old switch is labeled 1 and 2 and common. Take the 2 reds out of 1(old switch) and put them in L1 (dimmer)and the common(old) in the hole with the arrow symbol (dimmer). L2 is not used. You have a ceiling rose most likely so if you make changes at the light fixtures keep track of where your wires connect. Also new code is brown for hot wires so the old red ones are supposed to have little brown sleeves put on them....red is the old live color. I am assuming these sleeves a readily available at the electrical house. Your voltage is 240 volts to neutral so make freakin sure you arent powered when you work on this. The 2 blacks connected are your neutral and the green yellow is your earth.

Just to add the L2 is for two way or what we call in the US a 3 way circuit. So L1 and L2 would be utilized in your 2 way situations. In the US we call these the travelers to the other switch.

good Luck

Last edited by Stubbie; 12-08-2007 at 01:24 PM.
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Old 12-08-2007, 06:33 PM   #4
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Confirming light switch wiring


Sorry, I forgot to mention that I am in the UK. Thanks for the comprehensive reply. I will have the deepen the recess so that the deeper dimmer will fit, but I have test wired the dimmer and it works perfectly. Many thanks for the guidance!
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Old 12-08-2007, 06:42 PM   #5
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Confirming light switch wiring


You're welcome Chris... we have the same issues with too shallow of a recess in the US at times.
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