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Old 01-19-2010, 04:42 PM  
higleydp
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Default Wiring 12 VAC puck lights

I'd like to wire three individually switched 12 VAC 20-watt halogen puck lights in parallel to a single plug-in transformer. Is there any problem with switching only on the output side of the transformer, leaving it connected to 120 VAC at all times, even when all the lights are switched off?



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Old 01-19-2010, 06:50 PM  
travelover
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No, but it will waste some energy as opposed to switching it on the high voltage side.



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Old 01-19-2010, 07:13 PM  
higleydp
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Thanks for the quick reply, travelover. Am I correct in thinking that the wasted energy will be in the form of keeping the transformer warm?

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Old 01-20-2010, 07:18 AM  
travelover
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Yes. The primary winding will act like a small resistance heater and will be warm to the touch.

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