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Industrial Cable Glands: Types and Code Meanings Explained

In the electrical and instrumentation world, cable glands might seem like small accessories, but they play a big role in ensuring safety, reliability, and proper termination of cables. Whether you’re working in a refinery, manufacturing plant, or on offshore platforms, selecting the correct type of cable gland is critical. This blog post will walk you through the most common types of industrial cable glands and help you understand the meaning of the codes typically printed or engraved on them.

What is a Cable Gland?

A cable gland is a device designed to attach and secure the end of an electrical cable to the equipment. It provides strain relief, sealing, environmental protection, and ensures the cable remains mechanically stable and electrically grounded where necessary.

Why Are Cable Glands Important in Industry?

  • Safety: Prevents cable slippage and exposure to live wires.
  • Protection: Shields cables from dust, water, chemicals, and explosions.
  • Compliance: Meets international standards for hazardous and non-hazardous environments.
  • Durability: Reduces wear and tear from vibration or movement.

Types of Cable Glands Used in Industry

Cable glands are categorized based on material, application, and cable type. Here’s a breakdown of commonly used industrial cable glands:

1. Brass Cable Glands

  • Use: General purpose indoor and outdoor industrial environments
  • Key Features: Strong, corrosion-resistant when nickel-plated
  • Common Standard: BS 6121
  • Example: BW gland for armoured cables

2. Stainless Steel Cable Glands

  • Use: Corrosive environments like food processing or marine
  • Key Features: Excellent chemical and temperature resistance
  • Standard: EN 62444 / IEC 62444

3. Plastic (Nylon/Polyamide) Cable Glands

  • Use: Control panels, junction boxes, HVAC
  • Key Features: Lightweight, low-cost, resistant to UV and chemicals
  • Limitations: Not suitable for high temperatures or hazardous zones

4. Aluminum Cable Glands

  • Use: Lightweight requirement applications like aerospace or cleanrooms
  • Key Features: Light, corrosion-resistant, conductive

5. EMC Cable Glands (Electromagnetic Compatibility)

  • Use: Data centers, instrumentation, sensitive electronic equipment
  • Key Features: Prevents EMI (Electromagnetic Interference)

6. Explosion-Proof (EX) Cable Glands

  • Use: Hazardous zones like oil refineries, gas plants, chemical industries
  • Key Features: Certified for ATEX, IECEx, and NEC standards
  • Types:
    • Ex d: Flameproof
    • Ex e: Increased safety
    • Ex i: Intrinsically safe

7. Double Compression Cable Glands

  • Use: Outdoor or hazardous applications with armoured cables
  • Key Features: Two sealing points — inner and outer — for enhanced safety

8. Single Compression Cable Glands

  • Use: General-purpose and indoor applications
  • Key Features: Cost-effective, suitable for light-duty armoured cables

Understanding Cable Gland Codes and Markings

Cable gland markings are critical for identifying the right product. These codes typically include:

Material Code

  • BR: Brass
  • SS: Stainless Steel
  • AL: Aluminum
  • PL: Plastic or Polyamide

Thread Type Code

  • M: Metric thread (e.g., M20, M25)
  • NPT: National Pipe Thread
  • PG: Panzer-Gewinde (German thread standard)
  • BSP: British Standard Pipe

Size Code

  • Numbers usually represent thread diameter in mm (e.g., M20 = 20mm thread)

Application Type

  • BW: Indoor for armoured cables
  • CW: Outdoor for armoured cables with weatherproof sealing
  • E1W: Outdoor use with additional water sealing
  • A1/A2: For unarmoured cables
  • EX: Explosion-proof
  • EMC: Electromagnetic shielding type

Example Marking Breakdown:

SS-M20-E1W-EX

  • SS = Stainless Steel
  • M20 = Metric thread size 20mm
  • E1W = Type for outdoor armoured cables with sealing
  • EX = Explosion-proof certified

Cable Gland Selection Guide

EnvironmentRecommended Gland TypeMaterialProtection Level
Control Panel (Indoor)A1/A2Nylon or BrassIP54–IP65
Industrial OutdoorCW or E1WBrass or SSIP66–IP68
Hazardous (Ex Zone)EX d or EX eSS or BrassFlameproof/ATEX
EMC RequiredEMC GlandBrass/SSEMI Shielding
Corrosive (Marine)SS GlandStainless SteelIP67–IP68

Best Practices for Cable Gland Installation

  • Check IP rating: Match the ingress protection to the environment.
  • Ensure compatibility: Use the correct gland for armoured or unarmoured cables.
  • Follow torque specifications: Prevent damage by overtightening.
  • Use sealing washers: Especially for outdoor or panel applications.
  • Ensure certification: Particularly for Ex-rated glands in hazardous zones.

Real-World Example

A refinery required cable terminations for flameproof motors in Zone 1. The team selected Brass EX d E1W glands with IP68 rating, which offered:

  • Double compression for secure sealing
  • ATEX certification
  • Durability in explosive environments

This choice ensured compliance and operational safety.

Conclusion

Cable glands may be small, but their role in industrial safety and reliability is massive. Whether you’re dealing with harsh environments, armoured cables, or sensitive instrumentation, choosing the right gland ensures operational continuity and safety. Always refer to the cable gland marking and understand its meaning before installation.

Choose smart. Install right. Protect always.

For more technical insights, visit www.electricneutron.com — your trusted source for electrical and automation know-how.

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