In the electrical industry, confusion often arises between MC (Metal-Clad) and AC (Armored Cable). Many contractors assume these two types of cables are identical or interchangeable. In reality, although they share similarities in appearance and application, key technical and regulatory differences can significantly impact performance, safety, and compliance.
This article clarifies those distinctions and helps you choose the right cable for your next installation.
What Are MC and AC Cables?
MC (Metal-Clad) Cable
MC cable consists of insulated conductors and an additional insulated or bare grounding conductor, all enclosed within an interlocked metallic armor. It is widely used in commercial buildings, industrial facilities, and both exposed and concealed wiring systems.
AC (Armored Cable)
AC cable, also known as BX cable, contains insulated conductors and a bonding strip, with the armor itself serving as part of the grounding path. It is most commonly used in residential, light commercial, or retrofit applications where flexibility and ease of installation are key.
The Key Differences Between MC and AC Cables
| Feature | MC Cable | AC Cable |
|---|---|---|
| Grounding | Has a dedicated insulated or bare grounding conductor | Uses bonding strip + armor as the ground path |
| Environments | Suitable for wet or dry locations | Typically for dry locations only |
| Conductor Types | Can include THHN, THWN, or XHHW conductors | Uses THHN conductors only |
| NEC Article | 330 | 320 |
| Common Applications | Industrial, outdoor, feeders | Residential branch circuits, remodels |
These distinctions influence not only where the cable can be used, but also the level of safety and compliance it provides. For example, MC cables with their dedicated grounding wire offer enhanced protection in demanding or wet environments.
Advantages and Limitations
MC Cable Advantages:
- Suitable for both dry and wet locations.
- Offers superior grounding reliability.
- Ideal for modern commercial and industrial systems.
AC Cable Advantages:
- Lightweight and easy to handle.
- Cost-effective for standard dry applications.
Limitations:
- AC cable is limited to dry indoor installations.
- MC cable may be slightly higher in cost and less flexible for tight bends.
Choosing the Right Cable for Your Project
The correct choice depends on several factors:
- Installation environment – indoor/outdoor, wet/dry.
- Building type – residential, commercial, or industrial.
- Code compliance – always verify with NEC and local regulations.
Example Scenarios:
- MC cable: Power supply for rooftop HVAC equipment or outdoor feeders.
- AC cable: Interior branch circuits in office buildings or residential renovations.
Compliance and Safety
Safety is non-negotiable in electrical installations.
- Code Compliance: MC cables follow NEC Article 330, while AC cables fall under NEC Article 320.
- Grounding: Proper grounding and bonding ensure both performance and safety.
- Certifications: Always choose products that are UL and cUL listed, ensuring they meet North American safety standards.
Why Choose Dongguan Greater Wire & Cable Co., Ltd.?
At Dongguan Greater Wire & Cable Co., Ltd., we specialize in manufacturing high-quality AC90 cables - one of the most trusted armored cable products in the market.
Our AC90 cable offers outstanding performance, durability, and compliance advantages:
- Full UL and cUL certifications, ensuring complete safety and regulatory approval across North America.
- Excellent flexibility and strength, making it perfect for residential, commercial, and industrial installations.
- Superior manufacturing precision, guaranteeing consistent quality and long service life.
- Complete product range – from standard AC90 to customized solutions tailored to your project requirements.
Beyond the product itself, we pride ourselves on our professional technical support team, available 24 hours a day to answer your questions, provide installation guidance, and help you choose the most cost-effective cable solutions.
Whether you are a contractor, distributor, or project engineer, Greater Wire & Cable is your reliable partner for safe and efficient electrical wiring solutions.
📞 Contact Us Today:
- Dongguan Greater Wire & Cable Co., Ltd.
- Tel / WhatsApp / WeChat: +86 135 1078 4550 / +86 136 6257 9592
- Email: manager01@greaterwire.com