Fact Check: Is BX and MC cable the same?

Is BX and MC Cable the Same?

The claim at hand is whether BX and MC cables are the same. This question arises frequently in electrical discussions, particularly among professionals and DIY enthusiasts. Both types of cables are used for similar applications, but they are constructed differently and have distinct characteristics.

What We Know

1. Definitions:

   • BX Cable: BX is a brand name that refers to a type of armored cable, also known as AC (Alternating Current) cable. It consists of insulated conductors encased in a spirally wound steel tape sheath. BX cable does not typically include a separate ground wire; instead, the armor itself can serve as a ground path if properly bonded 19.
   • MC Cable: MC stands for "metal-clad" or "metallic-sheathed" cable. It is designed with a metallic sheath that can be made from aluminum or galvanized steel, and it often includes a separate ground wire within the cable 57.

2. Key Differences:

   • Grounding: One of the main differences is that MC cables come with a dedicated ground wire, while BX cables rely on the armor for grounding 18.
   • Material and Usage: MC cables are generally more versatile in terms of environmental suitability; they can be used in damp locations, while BX cables are not recommended for outdoor use 68.
   • Conductor Capacity: BX cables typically accommodate fewer conductors compared to MC cables, which can hold a greater number of insulated conductors 68.

3. Applications: Both types of cables are used in residential and commercial electrical installations, but the choice between them often depends on specific project requirements, including local electrical codes and environmental conditions 56.

Analysis

The sources consulted provide a range of perspectives on the differences and similarities between BX and MC cables. However, the reliability and credibility of these sources vary:

• Technical Articles: Sources like 1 and 5 provide detailed comparisons and are written by professionals in the electrical field. They offer clear distinctions based on technical specifications and practical applications, which enhances their reliability.
• Forums and Community Discussions: Sources such as 2 and 10 come from forums where professionals share experiences and opinions. While these can provide valuable insights, they may also reflect personal biases or anecdotal evidence rather than universally accepted standards.
• Informational Blogs: Websites like 3 and 4 present information in a more casual tone, which may appeal to a broader audience but can lack the rigor of technical documentation. The potential for oversimplification or inaccuracies is higher in these types of sources.

Conflicts of Interest

Some sources may have inherent biases based on their affiliations or the products they promote. For instance, if a source is closely tied to a manufacturer of one type of cable, their presentation of information might favor that product over others. It is essential to consider the potential for bias when evaluating claims about electrical components.

Methodology and Evidence

The methodology behind the claims made in these sources generally involves comparisons of material properties and construction methods. However, many sources do not provide empirical data or references to industry standards, which would strengthen their claims. More rigorous testing and standardized comparisons would be beneficial to substantiate the differences outlined.

Conclusion

Verdict: False

The claim that BX and MC cables are the same is false. Key evidence supporting this conclusion includes the distinct construction of each cable type, particularly regarding grounding methods, material composition, and environmental suitability. BX cables lack a dedicated ground wire and are not recommended for outdoor use, while MC cables include a separate ground wire and can be used in damp locations.

It is important to note that while both cable types serve similar purposes in electrical installations, their differences are significant enough to warrant careful consideration when selecting the appropriate cable for a specific application.

However, the available evidence does have limitations. Many sources lack empirical data or standardized testing to fully substantiate their claims, and some may present biased information based on affiliations. Therefore, readers should approach this topic with a critical mindset and evaluate information from multiple sources before drawing conclusions.

As always, it is advisable for readers to critically evaluate information themselves, especially in technical fields where safety and compliance with local codes are paramount.

Sources

1. The Difference Between MC Cable And BX Cable - News. Retrieved from Greater Wire
2. Armor Cable, MC, AC, BX etc. | Information by Electrical Professionals. Retrieved from Mike Holt
3. BX vs MC CABLE What is The Difference Between BX And MC CABLE. Retrieved from Hows Tech
4. BX Wiring: Life Cycle and Ways to Replace. Retrieved from Snell Heating & Air Conditioning
5. MC And BX Wire: Uses And Benefits. Retrieved from Ask Me DIY
6. What Is BX Cable and Its Complete Usage. Retrieved from Central Wires
7. MC Cable and BX Cable: What Is It? Retrieved from Fiber Savvy
8. BX Cables: What To Know Before You Buy. Retrieved from House Digest
9. What is the difference between AC vs. MC Cable. Retrieved from Do It Yourself
10. MC/BX/AC, please clarify. Also, what cut and bush do you use? Retrieved from Mike Holt