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What could cause this?

What could cause this?

What could cause this?

(OP)
The panel is 208/120 panel and it appears that the peak voltage is being clipped. Also, the user reported that dimmer switch that was installed would not work on A phase but it worked on B or C. Voltage readings were normal as you can see from the graph.

RE: What could cause this?

I see nothing abnormal. Flat top - caused by SMPS in computers and the like - some mild notching, probably dimmers. No probs at all.

Is the light source dimmable? Some aren't.

Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

RE: What could cause this?

(OP)
The issue is that this is a country club, they have a lot of lights but not that many computers. Could dimmers really cause this much voltage drop at peak?

Yes, the light source was dimmable. It worked on B or C phases.
 

RE: What could cause this?

Dimmers do not flatten the sine, the notches are probably the result of dimmers (or thyristor controlled drives - very unlikely). Modern appliances flatten sine waves. They also have lots of switch-mode power supplies. Does this country club have their own transformer? Or are there other consumers connected?

Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

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