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Old 07-12-2011, 06:17 AM   #1
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Overloaded Dimmers


We have a conference room with 19 recessed lights and two 3-way Lutron ay-103p dimmers. This is a commercial office building.

Dimmer 1 has 10 90w flood lights. Dimmer 2 has 9 90w flood lights.

Both dimmers are in a duplex metal box, with one fin broken between the two.

Per Lutron's specs, this decreases the capacity of each dimmer from 1000w to 800w, so dimmer 1 is 100w over and dimmer 2 is 10w over.

The screws and plastic cover plate are hot to the touch. When the cover plate screws are removed, they are hot in your hand. It's always been like this since the new building was built, but i'm just starting to get worried about it.

Is there dimmer we could replace these two with, that would still allow them to fit in the duplex box?

This was fully inspected and approved in Maryland in September 2006.

Thanks!

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Old 07-12-2011, 06:26 AM   #2
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Overloaded Dimmers


Nope. A 1500W dimmer requires a two-gang box for one dimmer.

Change the 90's to 75's.

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Old 07-12-2011, 06:32 AM   #3
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Overloaded Dimmers


I think it would be hard to find dimmers with higher wattage ratings that can sit side by side in a 2 gang box.

You said you have two banks of lights each on a 3 way dimmer subcircuit.

You might check to see if the second switch location has full 3 conductor traveler cables to the first location. In that case you could put one dimmer unit in each switch location accompanied by the remote unit for the other bank of lights. This will avoid the problem of having to break off the heat dissipating fins and lower the wattage rating.

Typically the traveler cable wiring for a 3 way dimmer setup has the black for hot, white for neutral, and red for a single traveler (control line) between the dimmer unit and the remote unit.

I think the terms master and slave can be confusing since the remote unit only exercises control while the dimmer unit responds (and exercises control over itself).
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Last edited by AllanJ; 07-12-2011 at 06:36 AM.
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Old 07-12-2011, 07:33 AM   #4
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Overloaded Dimmers


Use lower wattage bulbs.
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