12/4 MC Cable – Versatile Metal Clad Cable for 3-Phase and Multi-Circuit Power
12/4 MC Cable is a flexible armored electrical cable that includes four 12 AWG copper conductors and a ground wire. It is ideal for 20-amp 3-phase 208Y/120V systems, multi-wire branch circuits, and commercial lighting setups requiring four current-carrying conductors. This cable is protected by interlocked aluminum armor and is rated for dry location use without the need for conduit.
Common Applications for 12/4 MC Cable
- 3-phase lighting or receptacle circuits (208Y/120V)
- Shared neutral commercial branch circuits
- Office and retail power distribution
- Industrial machine wiring with separate control/hot conductors
- Multi-circuit feeders
Benefits of 12/4 MC Cable
- Four Conductors: Supports multiple circuits or 3-phase power systems
- Preassembled & Protected: Armor acts as conduit for easier installation
- Flexible Design: Simplifies routing through walls and ceilings
- Code Compliant: Meets UL and NEC standards for dry locations
- Saves Time: Faster installation versus pulling THHN through conduit
Frequently Asked Questions
Q: What is the ampacity of 12/4 MC Cable?
A: Generally rated for 20 amps per conductor, depending on derating and local code. Always verify with NEC tables and inspectors.
Q: Can I use 12/4 MC Cable for outdoor installations?
A: No, standard MC Cable is for dry indoor use. For outdoor/wet use, consider MC Cable with a PVC jacket (MC-HL type).
Q: What's the difference between 12/3 and 12/4 MC Cable?
A: 12/3 has three current-carrying conductors plus ground, while 12/4 has four, allowing an extra circuit or 3-phase wiring.
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