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Troubleshooting a Voltage Drop

Category Electrical
If you experience reduced voltage in your electrical service, it is important to consult an electrician. This guide is about troubleshooting a voltage drop.


Ask a QuestionHere are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community or ask a new question.

By 0 found this helpful
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. Where might the problem be? Nothing was done to the circuit prior to this problem.


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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By 0 found this helpful
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.


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.


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

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June 5, 20110 found this helpful

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

By Sharon


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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