Different Coatings on Armored Cable

AC Cable

• AC simply means armored cable. The coating is formed of either interwoven aluminum or steel braids, or a continuous interlocking coil of outer metal sheathing. The latter is stronger, but may not be as flexible. Inside the armored coating is an interior bonding wire that is interlinked with the external coating and provides the basis for safely grounding the cable. AC cable must comply with all National Electrical Code (NEC) specifications.

MC Cable

• MC means metal-clad. It is usually made from aluminum or steel, but it can be composed of copper. The coating is made with a continuous coil of interlocking metal, similar to AC, but stronger. It can also have a smooth coated or a corrugated effect. Another difference relates to the grounding protection; MC cable has a separate green internal insulated grounding conductor and works in combination with the outer MC coating to provide the ground connection. MC cable must comply with all NEC specifications.

AC Uses

• AC cable is suitable for internal usage where extra protection to the internal cables is necessary. However, AC cable has usage restrictions. For example, it is not suitable for service entrance applications, such as from the power supply pole to your home, unless the cable is contained inside a conduit. It is not certified for use in wet or damp environments, or where it is likely to be exposed to physical damage, without having a reinforced conduit. AC cable is used for internal industrial wiring, where cables are often fixed along internal walls and can be seen.

MC Uses

• MC cables have a higher specification than AC cables and can be used in industrial, healthcare and most domestic environments. Restrictions still apply, such as underground cabling, unless it has a protective plastic coating over the metal to protect against damp and wet conditions. MC cable is generally suitable to carry higher amperes than AC and often has more internal wires, making it suitable for multi-purpose cabling.