Introduction
Armoured cable is integral components in electrical installations, renowned for their durability and reliability in various industrial, commercial, and residential applications. Terminating these cables requires precision, knowledge, and adherence to best practices to ensure safety and efficiency. In this guide, we will delve into the intricacies of terminating armoured cables, providing step-by-step instructions, tips, and insights for optimal results.
Understanding Armoured Cables
Before delving into termination techniques, it's crucial to understand the anatomy of armoured cables. These cables consist of conductive cores surrounded by insulation layers, typically made of materials like PVC or XLPE (cross-linked polyethylene). The conductors are often twisted together for enhanced flexibility and conductivity.
What sets armoured cables apart is the additional layer of protection provided by metallic armouring. This armouring, typically made of galvanized steel or aluminum, shields the cable against mechanical damage, moisture, and other environmental hazards.
Tools and Materials
Before commencing the termination process, gather the necessary tools and materials:
Cable cutter or stripper
Insulation stripper
Armour cutter
Crimping tool
Cable glands
Terminal lugs
Insulating tape
Multimeter (for testing continuity)
Ensuring you have the right tools and materials minimizes errors and facilitates a smooth termination process.
Step-by-Step Termination Process
Preparation:
Ensure the power supply to the cable is turned off.
Examine the cable for any signs of damage or wear. Replace damaged sections if necessary.
Determine the length of cable required for termination and cut it to size using a cable cutter.
Stripping the Cable:
Use a cable stripper to remove the outer sheath of the cable, exposing the armouring and insulation layers.
Carefully strip back the insulation from the conductors using an insulation stripper, exposing the metallic cores.
Preparing the Armour:
Measure and mark the point on the armouring where you intend to terminate the cable.
Use an armour cutter to make a clean cut through the armouring, ensuring it is slightly longer than the gland's sealing area.
Inserting Cable Glands:
Select a suitable cable gland based on the cable diameter and application requirements.
Insert the cable gland onto the armoured portion of the cable, ensuring a secure fit.
Terminating Conductors:
Strip back the insulation from the individual conductors to expose the metallic cores.
Crimp terminal lugs onto the exposed ends of the conductors using a crimping tool. Ensure a tight and secure connection.
Assembling the Termination:
Insert the terminated conductors and the armoured cable into the cable gland.
Tighten the gland's compression nut to secure the cable in place, ensuring a watertight seal.
Insulation and Sealing:
Wrap insulating tape around the exposed conductors to provide additional protection against moisture and contaminants.
Ensure all connections are adequately sealed to prevent ingress of moisture or debris.
Testing:
Use a multimeter to test the continuity and integrity of the terminated connections.
Verify that there are no short circuits or open circuits present.
Final Checks:
Conduct a visual inspection of the terminated cable to ensure all components are properly installed and secured.
Double-check that the termination meets applicable safety standards and regulations.
Conclusion
Terminating armoured cables is a task that demands precision, attention to detail, and adherence to safety protocols. By following the step-by-step guide outlined above and using the right tools and materials, you can achieve reliable and durable terminations suitable for a wide range of applications. Remember to prioritize safety at all times and consult with professionals if you encounter any uncertainties during the termination process. Mastering the art of terminating armoured cables opens doors to efficient and dependable electrical installations, contributing to safer and more resilient infrastructure.