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Troubleshooting a Voltage Drop?

November 2, 2017

I have 120v leaving the switch to an outdoor lamp post. The voltage at the post is 24v. It is a direct run buried to the post with no junction boxes, etc.

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Where might the problem be? Nothing was done to the circuit prior to this problem.

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Bronze Post Medal for All Time! 105 Posts
November 3, 20170 found this helpful
Best Answer

Voltage drop -

  1. What is on your circuit?
  2. Have you added anything in your home lately?
  3. Have you switched out some appliances from one circuit to another?
  4. You must first determine what has changed in your home.
  5. If nothing has changed and the cable is run underground you could have a problem with the cable.
  6. Did you install the cable using the correct underground cable tube to protect your cable?
  7. You will need to dig up the cable and find out if there is an issue with the cable and the tube it is running in.
  8. You could have a problem with a cable breakage and he cable is rotting under the ground.
  9. I hope you have bought a special cable to run under the ground to your lamp post. This is also important when running your cable underground.
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  11. Have you done any sort of digging around or near the cable to the lamp post? This could be a problem and you might have nicked the cable.
  12. Check all of this to determine where the cable is shorting out and why the current isn't passing through the cable now.
 
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3 More Questions

Here are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community.

June 17, 2019

I recently installed one GFCI plug in my master bath next to a bathroom sink after it went out. I have 120 volts to both plugs on that plug. The next plug (bought new) on the same circuit, I only get 98 volts to 102 volts. Since this plug and the one that was replaced are within 6 feet of the 2nd bathroom sink and the bath tub, I would have thought it should have been a GFCI plug, but it had always worked before as a non GFCI plug.

The house was bought new by us and that is how it was originally wired and all worked fine. My question is how can the voltage drop from 120 volts to 98 to 102 volts on the same circuit? I am now considering buying another GFCI plug to replace the non GFCI plug to see if this makes a difference or would it be a waste of my money. The plug would not know if it is within 6 feet of a water source or is there another problem, I am missing?

Thank you in advance for your help!

Answers


Gold Post Medal for All Time! 677 Posts
June 17, 20190 found this helpful

You probably have a loose or corroded connection at either the house or power lines. Call the power company first. If it is at their end they will fix it at no cost to you.

 
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August 10, 2016

The meter is on the pole near the driveway. The line from the meter split bolts to the house and 2 shops. The house and shop 1 both have no problems, shop 2 has proper voltage on both phases until a load is applied. Once a load is applied there is a large voltage drop on 1 of the phases.

My question is what could cause this voltage drop on one phase. All that's in the sub panel is a 2 pole 20a, 1p20a, 2p50, and those feed a 220 plug, a 120v plug and a plug for a welder. The plugs, breakers, and wires to each have been replaced.

Answers

August 12, 20160 found this helpful

A poor connection.

A possible culprit here could be a poor electrical connection that is high resistance and when placed under any load produces a significant voltage drop. Be warned that a poor connection causing voltage drop produces heat.

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Have an electrician look into this or have your utility check the connection at the pole.

 
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June 5, 2011

Why would a switch be reading only 90 volts when its suppose to be 110?

By Sharon

Answers

June 7, 20110 found this helpful

The first thing I would do is check another outlet to be sure it is not a supply issue. I would not assume it is a problem with a switch till I checked other outlets(s).

 
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