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Old 08-30-2015, 10:19 PM   #21
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I had a call recently to inspect some dimming lights in a home. It started when they purchased a new coffee espresso machine to replace their old one. When the unit is turned on and is hearing the water and the Central A/C unit is running the lights in the house start dimming. 90% of the house is LED lamps and they do not show quite as much dimming. The worst of the dimming is a 10 or 12 lamp incandescent chandelier in the dining room off the kitchen. The espresso machine causes dimming regardless of which 20A small appliance branch circuit is used in the kitchen. All the lighting is on separate circuits from the kitchen counter receptacles. All feeder hots & neutrals appear tight and unoxidized. All branch circuit connections in all panels are tight. At the panel that the kitchen receptacles are fed from, the SABC feeder leg drops 2 volts upon turning the espresso machine on. The opposite leg increases 2 volts at the same moment. The dimming is much less noticeable when the central A/C is not running. The legs at the service and panels are at 115V & 117V. Any thoughts on the cause of this?
Plug two hair dryers into the same 20 amp receptacle and see if the results are the same. Of course...turn them on max..
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Old 08-30-2015, 10:32 PM   #22
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Plug two hair dryers into the same 20 amp receptacle and see if the results are the same. Of course...turn them on max..

Actually, there was some other work being done on the house and the guys were using a power saw that was causing the same results. The circuit the saw was running on came from a different circuit in a different panel.
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Old 08-30-2015, 10:49 PM   #23
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Actually, there was some other work being done on the house and the guys were using a power saw that was causing the same results. The circuit the saw was running on came from a different circuit in a different panel.
Was the circuit that the circular saw was on involved with the circuit you are wondering about...as in MWBC?
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Old 08-30-2015, 11:04 PM   #24
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No, all circuits in the house appear to be single, dedicated neutral circuits.
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Old 08-30-2015, 11:06 PM   #25
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No, all circuits in the house appear to be single, dedicated neutral circuits.
Okay, then, bad bearings on the circular saw..
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Old 08-31-2015, 12:28 AM   #26
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Okay, then, bad bearings on the circular saw..
Or it's the only MWC! The service!
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Old 09-01-2015, 07:53 AM   #27
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Or it's the only MWC! The service!

That's an interesting way to think of it, and I think you're right. I was at the job yesterday and took more measurements than I can remember. From what I can tell the issue is outside the house. One thing I noticed was the aerial span to the house. It looks like t was either chewed or severely scraped by branches. It appears that the aluminum is missing in some areas and all that is left is the steel core.
Dimming lights-imageuploadedbytapatalk1441108384.312583.jpgDimming lights-imageuploadedbytapatalk1441108395.414734.jpg
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Old 09-01-2015, 03:45 PM   #28
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Well, there ya go.

Out here, we always have them call POCO first on calls like this.
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Old 09-01-2015, 04:08 PM   #29
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Well, there ya go.



Out here, we always have them call POCO first on calls like this.

Well I learned the hard way; or they did, but now I know. Thanks for all the help guys.
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Old 09-01-2015, 04:16 PM   #30
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Remember this and learn.
Glad you found problems cause
99% of the time you have voltage drop on one leg and voltage rise on the other it's the main N
Loading does not cause voltage rise
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