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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... http://www.thecircuitdetective.com/3and4wyinfo.htm#threebasic

Posted on Dec 06, 2009

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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.
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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.
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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.)?

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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.

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HI
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.
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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.
HTH

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1 Answer

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