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Old 06-11-2012, 08:26 PM   #1
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Default Help with voltage loss

Can't figure this out, I have a customer that on one circuit has 3 kitchen recessed cans, that then feeds a study light, that then feeds a bedroom light that then feeds 1 receptacle, and two receptacles.
The issue is when ever the iron is plugged into either receptacle, the study and bed lights dim by 4.8V.
I checked every connection for a loose neutral or loose connection but that wasn't it.
I then noticed that the kitchen lights only dip 1.1V, so I thought there must be either a nail or screw in the wire from the kitchen switch to the study switch, where I am stuck; is the 1.1V dip on a load normal?
I don't want to run a new wire and then find that the lights still dim due to the 1.1V dip
I know this maybe obvious or basic to you guys but I just cant get my head around it.
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Old 06-11-2012, 08:37 PM   #2
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I think you're seeing perfectly normal voltage drop. For an iron drawing 12A, I get a voltage drop of about 5V for a 75 foot circuit.

-John
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Old 06-11-2012, 08:37 PM   #3
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Sounds like old wiring.
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Old 06-11-2012, 08:42 PM   #4
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Quote:
Originally Posted by bobelectric
Sounds like old wiring.
The home is only 3 years old
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Old 06-11-2012, 08:43 PM   #5
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Quote:
Originally Posted by Big John
I think you're seeing perfectly normal voltage drop. For an iron drawing 12A, I get a voltage drop of about 5V for a 75 foot circuit.

-John
Then why do I get 5V at the study - which is upstairs, and 1.1V in the kitchen - which is on the first floor???
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Old 06-11-2012, 08:51 PM   #6
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Is there backstabbing along the circuit?
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Old 06-11-2012, 08:54 PM   #7
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Then why do I get 5V at the study - which is upstairs, and 1.1V in the kitchen - which is on the first floor?
Could be a number of things: Are these two circuits of different lengths? Are they different gauge wiring? Or is this the same circuit being measured at two different points?

Voltage drop changes with circuit length and conductor size. The drop at the middle of a circuit will be less than the drop at the end of that same circuit.

-John
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Old 06-11-2012, 09:03 PM   #8
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Quote:
Originally Posted by Big John View Post
Could be a number of things: Are these two circuits of different lengths? Are they different gauge wiring? Or is this the same circuit being measured at two different points?

Voltage drop changes with circuit length and conductor size. The drop at the middle of a circuit will be less than the drop at the end of that same circuit.

-John
Basically this. Also amount of load on the circuit as mentioned above.
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