Electrical Code for Wire Type and Size
How to Know What Wire Size and Type to use for Home Electrical Wiring – Continuing the circuit with the same wire size and type is essential to maintain the integrity of the circuit.
Electrical Wire Size
[ad#block]Electrical Question: Is it legal to start a circuit with AC 12-2 and then mid circuit change the cable type to NM 12-2?
- The AC 12-2 does not have a separate insulated ground conductor however it only has the bare aluminum bonding strip.
- Also, where would the ground for the NM cable bond?
This Electrical Wiring Question came from: Eric, a Homeowner from Fairfax, Virginia.
Thanks for your electrical wiring question Eric.
How to Select the Right Size and Type of Electrical Wire
Maintaining Circuit Integrity
- Continuing the circuit with the same wire size and type is essential to maintain the integrity of the circuit.
- Bonding the circuit with any metal junction box using an approved grounding screw or method of attachment is required.
Wire Type Definitions In This Discussion
- AC Cable is Armored Cable, which is where individual wires are protected by a metal flex covering.
- NM Cable is Non-Metallic cable, which is where individual wires are protected by a plastic outer covering.
Components of Maintaining Circuit Integrity include Items within the Circuit that have the same Circuit Rating Factors, such as:
- Circuit Breaker
- Wire Size or Gauge
- Outer Wire Insulation Type
- Inner Wire Conductor Composition, Copper or Aluminum
- Wiring Junction Box or Enclosure
- Wiring Devices, Receptacle Outlet or Switch
The Dangers of Not Maintaining Electrical Circuit Integrity include:
- Circuit component overheating
- Combustion and Fire Danger
- Damage to devices connected to the circuit
- Damage to the building structure and personal property
- Electrical shock which can be fatal
The Following will assist you with your electrical question:
Electrical Panel Circuit Listing
Electric Circuit Listing
The size of the home electrical service panel is designed by calculating the square footage of the home and factoring in the code requirements for the electrical circuits that are required.
For more information about Electrical Code
Home Electrical Code
Electrical Code Directory covering:
- AFCI Circuits
- Electrical Boxes
- Electrical Circuits
- Electrical Outlets
- GFCI Protection
- Electrical Panels and Services
- Underground Electrical Wiring
- Home Electrical Wiring
- Smoke Detectors
The following may also be helpful for you:
Learn more about Home Electrical Wiring
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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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I am adding a couple outlets to an older house, i believe the existing wire is 12-2 (larger diameter wire) can i extend from the existing outlet with a 14-2 wire? Both are romex.
When extending or replacing the wiring of an existing circuit it is important to maintain the same wire size or gauge of the same amperage rating. This will prevent confusion about the actual capacity of the circuit and will maintain the integrity of the original circuit. 14-2 is commonly a 15 amp circuit rating, and 12-2 is commonly a 20 amp rated circuit, so you can see that these wire sizes should not be installed within the same circuit.
When upgrading electrical systems of an older home it is often necessary to install new circuits to areas such as the kitchen and bathrooms and provide GFCI circuit protection as well.