Type Ac Armored Cable Must Be Secured Every

Armored Cable: Securing Your Electrical System for Safety and Compliance

Armored cable, also known as AC cable or BX cable, offers robust protection for electrical wiring within various applications. Its metallic sheath provides shielding against physical damage, making it a popular choice for demanding environments. However, the strength and durability of AC cable are only fully realized when it's properly secured. Improper installation not only compromises safety but also violates electrical codes, leading to potential hazards and costly repairs. This comprehensive guide delves into the crucial aspects of securing armored cable, addressing the "where," "why," and "how" to ensure a safe and compliant electrical system.

Why Secure Armored Cable?

The necessity of securing armored cable isn't simply a matter of aesthetics. Several critical reasons underscore the importance of this practice:

1. Preventing Damage and Ensuring Longevity

AC cable, while durable, is still susceptible to damage from external forces. Improperly secured cable can be easily snagged, pinched, or crushed, leading to:

Wire breakage: This can cause power outages, sparking, and even fires.
Short circuits: Damaged insulation can lead to electrical shorts, potentially resulting in equipment malfunction or electrical shocks.
Reduced lifespan: Constant stress and strain on the cable will significantly shorten its operational life, necessitating premature replacement.

2. Meeting Electrical Codes and Regulations

Electrical codes, such as the National Electrical Code (NEC) in the US and similar regulations internationally, mandate the proper securing of all types of electrical cabling, including armored cable. These codes are designed to protect individuals from electrical hazards. Failure to comply can result in:

Inspection failures: Buildings and structures may fail inspections if AC cable securing isn't up to code.
Legal liabilities: In case of accidents or injuries caused by improperly secured cabling, property owners or installers may face legal repercussions.
Insurance issues: Insurance companies may refuse coverage or raise premiums if the electrical system doesn't meet safety standards.

3. Maintaining System Integrity and Performance

Securely fastened AC cable contributes to the overall integrity and efficiency of the electrical system:

Reduced vibration and noise: Loose cable can vibrate and generate noise, particularly in high-traffic areas. Proper securing minimizes these issues.
Improved signal quality: For applications involving data transmission, securely fastened cable helps prevent signal interference and ensures reliable data transfer.
Enhanced system reliability: A well-secured system is less prone to failures, reducing downtime and maintenance costs.

Where to Secure Armored Cable

The frequency and methods of securing armored cable depend largely on the specific application and installation environment. However, certain general guidelines apply:

At intervals not exceeding 4.5 feet: This is a common requirement specified in many electrical codes. The distance might vary depending on factors like cable diameter and environmental conditions. Always refer to the relevant local codes and regulations.
At all points of entry and exit: Secure the cable firmly at points where it enters and exits walls, ceilings, floors, junction boxes, and other enclosures. This prevents undue stress on the cable at these vulnerable points.
Around bends and corners: Secure the cable more frequently around bends and corners to prevent the cable from being pulled or damaged. Use appropriate bending radii to avoid kinking or crushing the cable.
Near terminations: Extra support is needed close to termination points to prevent strain on the cable connections.
In areas subject to vibration or movement: Additional securing may be necessary in areas prone to vibrations, such as industrial settings or locations with heavy machinery.

How to Secure Armored Cable

The methods used to secure AC cable vary depending on the specific installation requirements. However, several common techniques ensure proper fixation:

1. Cable Clamps and Staples

These are among the most commonly used methods for securing armored cable. Cable clamps are designed to grip the cable without damaging the outer sheath, while staples provide a more secure fastening, particularly in applications where the cable is subject to tension.

Choosing the right clamps and staples: Select clamps and staples appropriate for the cable diameter. Oversized fasteners can damage the cable, while undersized ones may not provide sufficient hold.
Proper installation: Ensure the clamps and staples are properly positioned to avoid pinching or crushing the cable. Use the correct tools for installation to avoid damaging the cable sheath.

2. Cable Straps and Ties

Cable straps and ties offer a flexible and convenient way to secure AC cable, particularly in bundles or where cable routing is complex.

Material selection: Choose straps and ties made of durable materials that can withstand the anticipated tension and environmental conditions.
Proper tensioning: Avoid over-tightening straps and ties, which can damage the cable. Ensure the cable is held securely but without excessive pressure.

3. Conduit and Fittings

For installations where the cable is run through conduit, securing the cable within the conduit itself provides additional protection. Appropriate conduit fittings should be used to ensure a secure and sealed connection.

Conduit selection: Choose conduit with an appropriate diameter and material to accommodate the cable and withstand the environmental conditions.
Fitting selection: Ensure all conduit fittings are properly secured and sealed to prevent moisture ingress and protect the cable from damage.

4. Support Structures and Trays

In larger installations, support structures such as cable trays and ladders provide a structured system for securing AC cable. These systems allow for efficient cable routing and minimize the risk of damage.

Proper sizing: Ensure the cable trays and ladders are appropriately sized to accommodate the cable volume and weight.
Secure mounting: The support structures should be firmly mounted to the structure to provide stable support for the cables.

Specific Considerations for Different Environments

The method of securing AC cable might need adjustments based on the environment:

High-temperature environments: Use heat-resistant clamps and straps in areas with elevated temperatures.
Damp or wet locations: Employ corrosion-resistant materials and ensure proper sealing to prevent moisture damage.
Hazardous locations: In environments with explosive gases or flammable materials, use special fittings and clamps designed for hazardous areas.

Best Practices for Securing Armored Cable

Beyond the fundamental techniques, several best practices enhance safety and compliance:

Plan the cable routing carefully: Plan the route of the cable in advance to minimize bends and corners and optimize securing points.
Use appropriate tools: Employ the correct tools for installation to avoid damaging the cable.
Regular inspections: Conduct regular inspections of the secured cable to identify any signs of damage or loosening.
Proper documentation: Maintain accurate records of the cable installation and securing methods for future reference.

Conclusion: Prioritizing Safety and Compliance

The proper securing of armored cable is paramount for ensuring the safety and longevity of any electrical system. By adhering to electrical codes, employing the appropriate securing methods, and following best practices, installers can create a reliable and compliant electrical installation that minimizes risks and enhances safety. Remember to always consult local electrical codes and regulations for specific requirements in your area. Neglecting proper securing practices can have severe consequences, so prioritize safety and compliance above all else. Investing time and effort in securing armored cable effectively contributes significantly to a robust and dependable electrical system.