Armoured vs Unarmoured Cable Glands: which one to choose?

Cable glands are vital components in electrical installations. They serve as protective fittings that secure and seal cable ends connecting to equipment. These fittings maintain electrical integrity while preventing moisture, dust, and contaminants from entering. When choosing cable glands, consider the cable type, environment, and required protection level. This article discusses two main types: armoured and unarmoured cable glands. Understanding their features and applications will help you make a decision for your needs.

Understanding Cable Glands

A cable gland is a device used to secure and seal the end of an electrical cable. It consists of several components, including a body, sealing mechanism, and locking nut. Its primary function is to provide mechanical support for the cable while ensuring a tight seal to keep out moisture and dirt. This prevents corrosion, short circuits, and potential equipment failure.

Additionally, cable glands offer strain relief. This helps reduce the risk of cable damage caused by pulling or twisting forces during installation or use. By maintaining a secure connection and protecting the cable, cable glands enhance the durability and reliability of electrical systems.

Armoured Cable Glands

What is Armoured Cable Gland?

Armoured cable glands are designed for cables with an external protective layer, usually made of steel or another durable material. This protective armouring offers increased resistance to mechanical damage, making these glands ideal for use in harsh or demanding environments. They provide extra security for cables, ensuring they withstand physical stress and potential impact during operation.

These glands are made from various materials, such as brass, stainless steel, or plastic, depending on the specific application. The choice of material depends on factors like the installation environment and the level of protection required. Armoured cable glands offer a reliable solution for securing and protecting cables in both industrial and outdoor settings, where durability and strength are essential.

Benefits

Enhanced Mechanical Protection

Armoured cable glands provide excellent mechanical protection, especially in demanding environments. Their robust construction shields cables from physical impacts, crushing, and other mechanical stresses. This makes them ideal for industrial settings where cables might be exposed to heavy machinery, constant vibrations, or rough handling.

The protective outer layer of Armoured cable gland ensures the integrity of the cable, preventing damage that could disrupt electrical systems. The sturdy design reduces the risk of wear and tear, extending the lifespan of cables. Armoured cable glands are highly reliable in outdoor installations where mechanical damage is a constant threat.

Resistance to Environmental Factors

Armoured cable glands are engineered to resist a variety of environmental challenges. These glands provide an effective barrier against moisture, dust, chemicals, and extreme temperatures. This resistance is crucial in outdoor and industrial environments where cables may be exposed to rain, dust storms, or corrosive substances.

In coastal or chemical processing industries, for example, corrosion is a significant concern, and these glands help prevent such damage. Additionally, their design minimizes the impact of temperature fluctuations, ensuring stable and reliable performance even in harsh conditions.

Improved Safety in Hazardous Locations

In hazardous environments, such as oil and gas, mining, and chemical industries, safety is important. Armoured cable glands are built to enhance safety by providing a secure, tight seal around the cable. They reduce the risk of electrical sparks. This helps prevent potential explosions in environments with flammable gases or dust.

Armoured cable glands also ensure that hazardous substances cannot penetrate the connection. They maintain the safety and integrity of electrical systems. By ensuring reliable performance in high-risk areas, armoured cable glands contribute to a safer working environment.

Applications

Armoured cable glands have a wide range of applications across various industries due to their robust protective features.

• Aerospace:In the aerospace industry, armoured cable glands are essential for protecting cables in aircraft and spacecraft. These environments demand high levels of reliability, as cables are exposed to vibrations, pressure, and mechanical stresses. Armoured glands keep the cables intact and secure. This prevents any disruption in the electrical systems.
• Oil and Gas:Armoured cable glands are widely used in the oil and gas sector. They are especially common on offshore drilling platforms and refineries. These environments are often harsh. Cables are exposed to chemicals, saltwater, and extreme weather conditions. Armoured glands protect the cables from corrosion and mechanical damage. This ensures the safe operation of equipment.
• Mining:The mining industry often operates in rugged terrains. Cables in these environments face constant exposure to mechanical damage. Armoured cable glands are essential for protecting cables in such conditions. They help cables withstand physical impacts and heavy loads. This protection reduces downtime and improves safety in mining operations.
• Construction:On construction sites, cables are constantly exposed to wear and tear. Armoured cable glands offer extra protection for these cables. They ensure that the cables remain functional despite rough handling. The glands also protect against physical stress. They are commonly used in temporary power setups and permanent installations in construction projects.

Unarmoured Cable Glands

Definition and Characteristics of Unarmoured Cable Glands

Unarmoured cable glands are designed specifically for non-armoured cables. These cables do not have an extra protective layer around them. As a result, unarmoured cable glands are generally simpler and lighter than armoured cable glands. They are commonly used in situations where the cable does not require additional physical protection from external forces or hazards.

The materials used to manufacture unarmoured cable glands include plastic, brass, and aluminum. Each material offers varying degrees of durability and corrosion resistance, depending on the application. Unarmoured cable glands are also easier to install due to their simpler design. They provide a secure seal and strain relief for non-armoured cables. This ensures reliable performance in less demanding environments where heavy-duty protection is not necessary.

Benefits of Unarmoured Cable Glands

Lightweight and Easier to Install

Unarmoured cable glands are generally lighter in weight compared to their armoured counterparts. This characteristic makes them easier to handle during installation. The reduced weight simplifies the mounting process, especially in situations where multiple glands are needed. Installers can work more efficiently and with greater ease, as unarmoured cable glands do not require as much effort to secure. This can be particularly beneficial in projects with tight timelines. Additionally, their lighter weight often leads to reduced shipping costs and less strain on the cables. This ensures a more straightforward installation process.

Cost-Effectiveness

Unarmoured cable glands are typically more affordable than armoured versions. This cost-effectiveness makes them a practical choice for various applications where extensive protection is not necessary. By opting for unarmoured cable glands, businesses and individuals can achieve significant savings without compromising on quality. This affordability is particularly beneficial for large projects or installations requiring numerous glands. Additionally, the lower price allows for more budget flexibility. This flexibility enables the allocation of funds to other critical areas of a project. For applications that don’t face significant mechanical risks, unarmoured cable glands provide a reliable and economical solution.

Suitable for Indoor and Low-Risk Environments

Unarmoured cable glands are ideally suited for indoor applications or areas with minimal risks of mechanical damage. Their design provides sufficient protection against moisture and dust. This makes them perfect for residential and commercial settings. These glands effectively seal cable entries, ensuring that internal components remain safe from environmental factors. Since they are not subjected to harsh external conditions, unarmoured cable glands excel in applications where durability against mechanical impacts is less of a concern. Their effectiveness in protecting electrical connections makes them a reliable choice for various indoor environments, including offices, homes, and controlled industrial spaces.

Applications of Unarmoured Cable Glands

Unarmoured cable glands are commonly found in:

• Residential Installations:Unarmoured cable glands are often used in household electrical systems. They are suitable for environments with minimal exposure to mechanical stress. In residential settings, these glands secure and seal cables for lighting, appliances, and other electrical devices. Their straightforward installation and adequate protection make them ideal for indoor use, where conditions are typically stable and less demanding.
• Commercial Buildings:In commercial settings, unarmoured cable glands are common in office environments and retail spaces. They are utilized for lighting, power distribution, and data connections. These glands provide reliable sealing and protection without the need for heavy-duty materials.
• Low-Risk Industrial Applications:Unarmoured cable glands are also suitable for low-risk industrial applications. Factories and warehouses with limited environmental hazards often use these glands for cable management. They protect against dust and moisture, ensuring a safe and efficient operation. In these settings, unarmoured cable glands provide adequate support for electrical installations while minimizing costs and complexity.

Key Differences Between Armoured and Unarmoured Cable Glands

When selecting cable glands for your electrical installations, it is essential to understand the differences between armoured and unarmoured options. Each type serves specific purposes and is suited for different environments. Below, we explore the key differences between armoured and unarmoured cable glands

Mechanical Protection

Armoured cable glands provide superior mechanical protection thanks to their robust construction. They are built to withstand impacts, crushing forces, and other physical stresses. In contrast, unarmoured cable glands offer basic protection that is adequate for environments with minimal risk.

Environmental Resistance

Armoured cable glands excel in resisting moisture, dust, chemicals, and extreme temperatures. This makes them suitable for outdoor and harsh environments. Unarmoured cable glands, while still protective, are better suited for indoor settings where environmental hazards are limited.

Installation Complexity

Unarmoured cable glands are typically easier to install. Their lighter weight and simpler design facilitate quick installation. However, Armoured cable glands may require more careful handling and specific techniques, especially with heavier cables.

Cost Considerations

Armoured cable glands are generally more expensive due to their enhanced features and durable materials. On the other hand, unarmoured cable glands are more cost-effective. They are a suitable choice for projects with budget constraints while still providing adequate protection.

How to Choose the Right Cable Gland

When selecting between armoured and unarmoured cable glands, consider these key factors:

1. Type of Environment

Determine if the installation is indoors or outdoors. Assess potential exposure to moisture, dust, or chemicals.

• Armoured Cable Glands:Use in outdoor installations or environments with high exposure to moisture and chemicals, such as construction sites and chemical plants.
• Unarmoured Cable Glands:Suitable for indoor settings like residential homes and commercial buildings with minimal environmental hazards.

2. Risk of Mechanical Damage

Evaluate the likelihood of physical impacts or stresses that may affect the cable’s integrity.

• Armoured Cable Glands:Ideal for areas prone to heavy impacts, such as manufacturing facilities and industrial settings.
• Unarmoured Cable Glands:Best for low-risk environments where mechanical stress is minimal, such as office spaces.

3. Budget Constraints

Establish your budget. Compare the costs of armoured versus unarmoured options to find the best fit for your needs.

• Armoured Cable Glands: Justified in high-stakes applications where enhanced protection is critical, despite higher costs.
• Unarmoured Cable Glands:Cost-effective choice for projects with budget limitations, while still providing adequate protection in less demanding applications.

Conclusion

The choice between armoured and unarmoured cable glands depends on your project’s specific needs. Armoured cable glands provide superior mechanical protection and environmental resistance. This makes them ideal for harsh conditions and hazardous environments. In contrast, unarmoured cable glands are lightweight and cost-effective. They are suitable for less demanding applications.

By understanding the key differences and applications of each type, you can make a right decision. This ensures the safety and reliability of your electrical installations. Always consider the environment, potential risks, and budget when choosing the right cable gland for your needs.