How to Test Electrical Wiring for a Light Fixture
Is there a problem with the voltage to my light fixture? How to Test Electrical Wiring for Light Fixtures.
Testing Light Fixture Wires
Electrical Question: Is there a problem with the voltage to my light fixture?
- I was recently replacing a porch ceiling light in my old house. There was no light there for quite a long time. The wires were still in place and was connected to 2 switches in the entrance way. One switch controlled an older fixture from a previous owner, which was disconnected from the junction box in the basement to which it was originally wired to.
- My son removed one switch which the lights were connected to in tandem somehow. He purchase a new switch for the installation.
- When he measured the voltage from the source, it only read 105 Volts on the meter.
- He installed the switch and measured the voltage at the ceiling box where the light would be installed. The reading was 105Volts on the meter again.
- He installed the light, turned the power on, but the light did not work.
- He measured the voltage in the bulb base socket and measured 105 Volts again. Can you advise me what the problem may be?
- We checked the bulbs and they all work fine. We made sure the bulb and socket connections made contact, tried again, but the bulbs did not light. Incandescent or Fluorescent both tried and did not work.
I really do appreciate any assistance you may provide.
This electrical wiring question came from: Ron, a Homeowner from Jersey City, New Jersey.
Thanks for your electrical wiring question Ron.
Voltage Readings for Light Fixtures
- Testing Voltage
- Testing electrical wiring can produce different results depending on the method, so it is best to test each insulated wire to ground, one at a time, and then test between the two insulated wires, typically black and white for 120 volts.
- Abnormal Voltage
- If an abnormal voltage reading is produced then the circuit and other loads or devices that are connected to the circuit must be identified, inspected and tested as well.
- Causes of Low Voltage
- When a lower voltage reading is produced it is very possible that the reading is due to a feedback of voltage through the neutral wire, which is very typical with incandescent lighting circuits.
- Neutral Wire Voltage
- The neutral wire may be producing voltage that the tester indicates, but when an actual load is applied to the circuit the full circuit voltage is not available on the hot side of the circuit.
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Fully explained pictures and wiring diagrams about wiring light switches describing the most common switches starting with photo diagram 1.
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