Fine Tuning a Dimmer Switch

Little Bill

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Staff member
Location
Tennessee NEC:2017
Occupation
Semi-Retired Electrician
Some dimmer switches have adjustment pots to fine tune the dimmer. I've used these for a long time, mostly with Lutron dimmers. I was looking on the instructions for a Legrand dimmer and it said you need to turn the power off when adjusting the pot/wheel. Why would that matter? It would be a royal pain to turn power off, adj the pot, power back on, test, rinse and repeat until it's where you want it.

I've never turned the power off on Lutron dimmers. Is this just a CYA thing from Legrand in case someone gets shocked adjusting the pot? Or would it damage the dimmer if adjusting with power on?
 
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