In the industrial world, managing electrical installations effectively is a top priority. Cables are critical for transmitting power, data, and signals, while cable glands serve as protective devices to secure and maintain the integrity of these connections. When it comes to armoured cables, the right choice of cable gland is particularly important. Armoured cables are widely used in environments where additional protection is needed, and the cable glands used with them must be capable of handling the armor while maintaining secure electrical connections.

In this blog, we’ll explore everything you need to know about Cable Gland Armoured. From the importance of using the correct gland to the different types available, this guide will help you make informed decisions about your industrial electrical setups. We’ll also answer five frequently asked questions to help you further understand this important subject.

What is an Armoured Cable?

An armoured cable is an electrical cable with a metal sheath, typically made from steel, surrounding the cable’s core. This metal armor serves as an additional layer of protection against physical damage, mechanical stresses, and external environmental factors such as moisture, chemicals, and heat. Armoured cables are commonly used in industries where conditions are harsh, such as in underground installations, heavy machinery, oil and gas platforms, and power distribution networks.

The armor in these cables helps to prevent them from being crushed or damaged in rugged conditions, ensuring that the cable remains operational and safe even in high-risk environments.

Why Use Cable Glands with Armoured Cables?

Cable glands are essential components in any electrical installation because they secure and seal the ends of cables where they enter equipment or junction boxes. When dealing with armoured cables, cable glands play an even more critical role by managing both the armor layer and the electrical conductors inside.

Here’s why cable glands are crucial for armoured cables:

1. Sealing and Protection: Cable glands for armoured cables provide secure sealing to prevent moisture, dust, or hazardous substances from entering the cable and damaging the electrical connection.
2. Strain Relief: These glands protect the cable from being pulled out of place, particularly in high-vibration environments. They provide strain relief, which helps to maintain the integrity of the cable connection.
3. Armor Handling: Armoured cables require specialized glands that can grip both the cable’s outer sheath and the metal armor. This ensures that the armor is terminated correctly without affecting the core conductors, providing a safe and secure installation.
4. Compliance with Safety Standards: Many cable glands for armoured cables meet strict industry standards such as IP68 and ATEX for use in hazardous environments. Using certified glands ensures compliance with safety regulations.

Types of Cable Glands for Armoured Cables

There are several types of cable glands designed specifically for armoured cables, each offering different levels of protection and functionality. Understanding these types will help you choose the right gland for your specific application.

1. Single Compression Glands:
• These glands compress the outer sheath of the armoured cable, providing basic sealing and mechanical support. Single compression glands are suitable for indoor applications where environmental hazards such as moisture or dust are minimal. However, they may not provide sufficient sealing for harsh outdoor or hazardous environments.
2. Double Compression Glands:
• Double compression cable glands provide sealing and support at two points: the outer sheath and the armor layer. This dual compression offers enhanced sealing and strain relief, making these glands ideal for outdoor and industrial applications where cables are exposed to dust, moisture, and mechanical stress. Double compression glands are widely used in industries such as oil and gas, petrochemicals, and mining.
3. Flameproof (Ex) Cable Glands:
• Designed for use in explosive or hazardous environments, flameproof glands (also known as Ex glands) are certified to meet international standards such as ATEX and IECEx. These glands ensure that no sparks or electrical faults escape the connection point, making them suitable for environments where flammable gases or dust are present, such as oil refineries and chemical plants.
4. EMC (Electromagnetic Compatibility) Cable Glands:
• These glands are designed to protect armoured cables from electromagnetic interference (EMI). They are essential in environments where sensitive equipment could be affected by surrounding electrical fields, ensuring that the cables transmit clean signals without noise or interference.
5. Waterproof Cable Glands:
• For outdoor installations where cables are exposed to rain, humidity, or water, waterproof glands with high ingress protection (IP68 or IP69) are required. These glands prevent water from entering the cable and causing electrical faults, making them ideal for marine, offshore, and underground applications.

Applications of Cable Glands for Armoured Cables

Armoured cables, combined with the right cable glands, are used across a variety of industries and environments. Some of the most common applications include:

1. Oil and Gas Industry:
• In oil rigs, refineries, and offshore platforms, armoured cables are exposed to hazardous gases, chemicals, and extreme weather conditions. Cable glands for armoured cables in these environments provide enhanced sealing and protection to ensure that cables remain safe and functional.
2. Mining Industry:
• Mines are harsh environments where cables are subjected to physical stress, vibrations, and debris. Double compression cable glands provide the necessary protection to ensure that the cables remain secure and resistant to damage.
3. Power Generation and Distribution:
• In power plants and substations, reliable transmission of electricity is crucial. Armoured cables, along with IP68-rated cable glands, are used to protect cables from environmental factors such as moisture, dust, and high temperatures.
4. Marine and Offshore Applications:
• In marine environments, armoured cables are exposed to saltwater, humidity, and constant movement. Waterproof cable glands ensure that the cables remain sealed and protected from corrosion and water ingress, providing reliable performance.
5. Underground Installations:
• In underground power or communication lines, armoured cables are buried to protect them from physical damage. Cable glands for these installations must provide robust sealing and strain relief to ensure long-term performance.

Factors to Consider When Choosing Cable Glands for Armoured Cables

When selecting the appropriate cable gland for an armoured cable, several key factors should be considered to ensure a safe and secure installation:

1. Cable Diameter: Ensure the gland fits the diameter of both the inner core and the armor of the cable. Refer to the manufacturer’s specifications to choose the right size.
2. Environmental Conditions: If the cable is exposed to moisture, chemicals, or dust, select a gland with a high IP rating (e.g., IP66, IP68). For hazardous environments, ensure the gland is certified to ATEX or IECEx standards.
3. Type of Armor: Different types of armor, such as steel wire or steel tape, may require specific gland designs. Make sure the gland is compatible with the cable’s armor type.
4. Application Requirements: Consider the mechanical stresses and environmental hazards the cable will be exposed to, and choose a gland that offers the necessary level of protection and strain relief.
5. Compliance with Standards: Always choose cable glands that comply with industry standards for safety and performance, especially in hazardous environments.

5 Frequently Asked Questions about Cable Glands for Armoured Cables

1. What is the main difference between single and double compression cable glands for armoured cables?
• Single compression glands provide sealing at the outer sheath of the cable, while double compression glands provide dual sealing at both the inner armor and the outer sheath. Double compression glands offer better protection and are preferred for outdoor and hazardous environments.
2. Can cable glands for armoured cables be used in explosive environments?
• Yes, flameproof (Ex) cable glands are designed for use in hazardous or explosive environments. These glands are certified to meet international safety standards like ATEX and IECEx, ensuring safe installation in areas with flammable gases or dust.
3. Are waterproof cable glands necessary for outdoor armoured cable installations?
• Yes, waterproof cable glands with high ingress protection (IP68 or higher) are essential for outdoor installations where the cables are exposed to moisture or water. These glands prevent water ingress, which could lead to electrical faults.
4. How do I choose the right size of cable gland for my armoured cable?
• To select the right size, measure the cable’s overall diameter, including the armor. Refer to the gland manufacturer’s sizing guide to ensure the gland fits both the inner core and the armor properly.
5. Can cable glands for armoured cables protect against electromagnetic interference (EMI)?
• Yes, EMC cable glands are specifically designed to protect armoured cables from electromagnetic interference, ensuring that signals transmitted through the cable remain clear and free from noise or distortion.

Conclusion

Cable glands for armoured cables are essential components that ensure the safety, reliability, and performance of electrical installations in harsh and hazardous environments. By choosing the right cable gland for your specific application, you can protect your cables from environmental factors, mechanical stress, and electromagnetic interference. Whether you are installing cables in an oil refinery, a power plant, or an underground system, the right cable gland will provide the necessary protection and sealing to ensure long-term performance.