Repairing Security System Telephone Wiring
How to Identify and Splice Telephone System Cables – Telephone system wiring is considered low voltage however when a call comes in there could be up to 90 volts present.
How To Identify and Splice Security System and Telephone Cables
Electrical Question: I cut all of the wires to the security systems main box because we hadn’t ever used it in 7 years.
- Now I do not have phone service. All of the wires fell under the house, so I do not know where they went.
- There are 7 4-wire cables of solid color and 1 8-wire.
- What all do I need to connect to what when I get under the house?
This electrical wiring question came from: James, a Homeowner from Kokomo, Indiana.
See more about Home Wiring for Indiana
Thanks for your electrical wiring question James.
How to Identify and Splice Telephone System Cables
- Some of the cables would have been used for the alarm system sensors and devices while the telephone cables would have been used for the house phone system and auto dial up system to place a call and report an alarm.
- The telephone cables must be identified and spliced together apart from the security system sensors.
- The telephone cables are typically
- Cat 3, which is 4 wires, 22 or 24 gauge
- Cat5, which is 6 wires, 22 or 24 gauge
- How to Splice Telephone Wiring
- Small gray or blue wire connectors, or Scotch crimp splice connectors for two 22 or 24 gauge wires.
- Located the two cables which have been cut.
- Strip back the outer insulation about 4 inches.
- Separate the individual wires.
- If wire connectors are used then strip back the insulation about one half inch then twist the two wires together and twist on the wire connector.
- If using the crimp splice connectors then just match the same color wires together, slide all the way into the connector then using pliers firmly crimp down onto the connector.
Telephone system wiring is considered low voltage however when a call comes in there could be up to 90 volts present, so be well insulated and lay on a dry insulated surface to prevent direct contact with the ground and handle one wire at a time. The splices do not require to be in a junction box, just keep it neat and tidy, and staple the cables up against the floor joists. Usually there is some slack in the length of wires, so I like to bring them together and tie them into a knot.
The Following will assist you with Telephone System Cables
For more information about Phone Jack Wiring
Phone Jack Wiring
This telephone wiring diagram with photos and instructions will show you the direct steps to correctly wiring a telephone jack.
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 Wiring!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, [amazon.com], I use for the detection of Standard 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.
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