BX vs MC Cable: What’s the Difference and Which One Should You Use?

When choosing armored cable for your electrical installation, you’ll often face a common question: BX vs MC cable—what’s the difference? While these terms are sometimes used interchangeably, they refer to two distinct types of armored electrical cables with unique features, code requirements, and ideal use cases.

In this article, we break down everything you need to know about BX and MC cable: from construction and usage to NEC compliance and pricing—so you can make an informed decision for your residential, commercial, or industrial wiring project.

bx vs mc cable

🔍 Quick Answer: BX vs MC Cable

• BX cable (technically known as AC cable, or Armored Cable) is an older style of armored cable with a bonding strip and typically no separate ground wire.

• MC cable (Metal-Clad cable) is a modern version with a dedicated ground wire and improved code compliance for more applications.

• Use MC cable for most new installations, especially where grounding, moisture resistance, or code compliance is critical.

🔧 What Is BX Cable?

“BX” is a trade name from the early 20th century (by General Electric), commonly used to describe AC cable (Armored Cable). Although the name 'BX' is still used in the industry, AC cable is the correct modern term.

BX Cable Construction

• Conductors: Typically 2 or 3 THHN-insulated copper wires

• Grounding: No dedicated ground wire; uses a thin bonding strip in contact with the armor

• Armor: Flexible interlocked aluminum or steel

• Use: Mainly in older homes, remodels, or areas where conduit is not required

Pros of BX Cable

• Simple to install in retrofit jobs

• Provides mechanical protection

• Still accepted in some residential code areas

Cons

• No dedicated ground conductor

• Not suitable for wet or outdoor use

• Limited in commercial and industrial applications

⚙️ What Is MC Cable?

MC (Metal-Clad) cable is a newer armored cable designed to address the limitations of BX/AC. It includes a full-size ground wire and is approved for a wider range of applications under the National Electrical Code (NEC).

MC Cable Construction

• Conductors: THHN or THWN-2 insulated copper or aluminum wires

• Grounding: Includes a dedicated bare or insulated ground wire

• Armor: Interlocked aluminum or steel, sometimes PVC-jacketed for moisture resistance

• Variants: MC-HL (Hazardous Location), PVC Jacketed MC, MC-Lite

Advantages of MC Cable

• Fully code-compliant for modern installations

• Suitable for wet, damp, and outdoor locations (with proper rating)

• Can be used in commercial, industrial, and residential applications

• Easier to terminate with MC connectors

• Available in many configurations: 12/2, 12/3/3, 14/2, 10/2, etc.

Limitations

• Slightly more expensive than AC cable

• Requires correct connectors and bending tools

🧯 NEC Code Differences

🏗️ Use Cases

💬 Frequently Asked Questions

Q: Can BX cable be used outdoors?
A: No. BX or AC cable is not rated for wet or outdoor use.

Q: Is MC cable safer than BX?
A: Yes. MC cable includes a dedicated ground and offers better code compliance and protection.

Q: Can I use BX cable for new construction?
A: You can in some areas, but MC cable is generally preferred and more widely accepted.

Q: Why is MC more expensive?
A: MC cable includes more safety features and complies with modern codes—making it more versatile and reliable.

🔗 Related Searches

• MC cable vs AC cable

• Is BX cable legal?

• BX cable vs Romex

• What is MC-HL cable?

• MC cable installation requirements

• Metal clad cable types

🏷️ Need MC Cable?

We stock a full range of MC cables including:

• 12/2 MC Cable

• 12/3/3 MC Cable

• PVC jacketed MC cable

• MC Cable Connectors & Clamps

Contact us for a bulk quote or tech support on your next project.