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.
Electrical Question #2: My electrical wiring project involves a Fluorescent Light in the Basement.
I have both a black and a white unconnected wires, yet they both have 110 current to them. The lights they go to do not work. When I connect the white to ground and the black to a breaker the lights work. Why is there not a short and how do I find where the current is being supplied to the wires?
This electrical wiring question came from Clay, a Homeowner in Bountiful, Utah.
Thank you for your electrical wiring questions.
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.
More about Testing Electrical Wiring
Understanding Electrical Testers
When working on home electrical wiring using voltage testers can play an important part in electrical safety. Electrical testers enable you to identify electrical circuits and help prevent the possibility of accidental electrical shock.
Types of Electrical Testers
Wiring a Light Switch – Diagram 1
Fully explained pictures and wiring diagrams about wiring light switches describing the most common switches starting with photo diagram 1.
Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
The Safest Way to Test Electrical Devices and Identify Electric Wires!The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.
The Quickest Way to Check for Faulty Electrical Wiring!The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.
Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..
The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.
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