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How to install a 2way crabtree dimmer switch - Electrical Supplies

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Posted on Jan 02, 2017

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SOURCE: i am replacing a light switch for a 2way dimmer

ok- this is a complicated one... first these are called 3-way switches... two switches controlling one light(s) try this web site to help you figure it out.. you will probably have to open up the ceiling fixture to figure out which wire is which...

Posted on Dec 06, 2009


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1 Answer

Switch and dimmer work opposite each other

Refer this issue directly to Lutron. They could have an ineresting explanation!

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How to fit dimmer switch

The dimmer switch you select will depend on the type of bulbs you will be using. The 'original type ' of dimmer works with regular incandescent bulbs and halogen bulbs only. They cost around $15.00. Then there are dimmers for compact florescent (cfl) bulbs and LED lights that are dimmable, as well for regular light bulbs. These types of dimmers are more expensive, ranging in price form around $40.00 upwards.
Light Switches Dimmers

If you are replacing a single pole switch ( just one switch that operates lights) you'll need a single pole dimmer. If you are replacing a 3-way switch ( two switches that operate the same light) you'll need a 3-way dimmer.
Installing the dimmer is pretty straight forward. All dimmers come with installation instructions. Make sure you turn off the circuit breaker for the particular switch you are replacing.

May 29, 2013 | Electrical Supplies

1 Answer

Dimmer lights installed but go out after 10 minutes?

Hi Frederick,

I'm an electrician and would like to help you solve this problem. I have several questions to ask to help narrow down the cause.

Is this switch installed in the same box as another dimmer switch?

Did you need to modify the heat sync fins to fit the switch into the box?

Was this dimmer recently installed to replace a switch or old dimmer? If so, what was there before?

How many bulbs and their correscponding wattage and type (incandescent, compact fluorescent, etc.) are being controlled by the dimmer?

Is there any non-lighting load connected (paddle fan, etc.)?

Can you provide the dimmer manufacturer's name & model of the dimmer? You said you have a "2 way" dimmer and there is no such beast - I suspect that you have a 3 way dimmer.

Without answers to the above - I suspect either an excessive heat issue due to overloading or ganging of several dimmers in one large box or improper use of the dimmer controlling a motor or other non-lighting or non-dimmable load.

Leave a comment with the answers and I can help pinpoint the problem.

Feb 28, 2013 | Electrical Supplies

1 Answer

I have a dimmer switch installed and it wont work with the celing fan

Your question has two switches and 1 dimmer.
The fan switch works.
The light switch works.
The dimmer does not. What is the dimmer connected to?
Dimmers typically will not control fan speed unless they are rated to do that.
Do you have a 3-way switching where two switches control same light, and you installed the dimmer in place of 3-way switch?

Sep 06, 2012 | Westinghouse Contempra Trio 42" Ceiling...

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Connecting a Superswitch touch dimmer

A blast from the past "Superswitch" depending on manufacturer terminals vary but it is just a change over switch (1g 2w) with a meter check for continuety between 1 & 2 or 1 & 3.
1 was usually common (small c at side) with 2 being n/o and 3 n/c.
If you have the MK model switching is by Triac so (if you feel safe) connect your switch wires to 1 & 2 and try it .If nothing use 2 and 3,

Crabtree version had s1 s2 and com3 look closely at switch.

Nov 11, 2009 | Kitchen Appliances - Others

3 Answers

I have bought Crabtree dimmer switch but it came without wiring instructions. There are 3 terminals, one marked L1, one L2 and the other with a wavy line with an arrow across it. Which one does the 'line'...

This is a 2way dimmer the wavy line is the common so your live supply will connect to this terminal .For 2way switching your strappers go in L1 L2 if you only require 1 way switching use either for your feed out to the fitting and disregard the spare terminal.

Oct 21, 2009 | Kitchen Appliances - Others

1 Answer

I am replacing a light switch for a 2way dimmer

ok- this is a complicated one... first these are called 3-way switches... two switches controlling one light(s) try this web site to help you figure it out.. you will probably have to open up the ceiling fixture to figure out which wire is which...

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Unfortunately, the hum is normal for operation of that type of dimmer at low levels.  Sometimes the lamp filaments will also "sing" a high pitched sound.

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Connect the black wire to live. and the white wire to neutral. I hope this will help you.

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Crabtree 1G 2W 250W Dimmer Black Nickel

Just look at the plate and you can see that it is not very thick. It will split almost in the middle of it's thickness. Take the small screw driver and slip it between them and don't be gentle just push it straight in and it will split.

Oct 25, 2008 | Electrical Supplies

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