how to calculate gland size for cable?

Mar 08 , 25

Learn how to accurately calculate cable gland size for armored and unarmored cables. Includes step-by-step instructions, measurement tips, and industry standards (IEC 62444) to ensure proper sealing and strain relief. To calculate the appropriate gland size for a cable, follow these structured steps:

1. Identify Cable Type and Construction

• Armored vs. Unarmored: Determine if the cable has armor (e.g., steel wire armoring) which requires a gland designed to clamp the armor for grounding and strain relief.
• Number of Cores: Multi-core cables have larger diameters than single-core cables of the same cross-sectional area.
• Material and Environment: Consider environmental factors (corrosion, temperature) to select gland material (brass, stainless steel, plastic).

2. Measure Cable Dimensions

• Outer Diameter (OD): Use calipers to measure the cable’s OD accurately. For armored cables, measure both the overall OD (over armor) and the inner sheath OD (under armor).
• Armor Diameter: If applicable, measure the diameter of the armor layer separately.

3. Select Gland Type

• Armored Glands: Required for armored cables to grip the armor.
• Unarmored Glands: Suitable for standard cables without armor.
• IP Rating and Material: Choose based on environmental needs (e.g., IP68 for waterproofing, stainless steel for corrosive environments).

4. Refer to Manufacturer’s Gland Size Chart

• Match the measured cable OD to the gland’s specified range (e.g., a gland rated for 12–18mm OD accommodates a 15mm cable).
• For armored cables, ensure compatibility with both the armor and inner sheath diameters.

5. Verify Thread Specifications

• Thread Type: Match the gland’s thread (e.g., M20 metric, PG13.5, NPT) to the equipment’s entry point.
• Thread Size: Larger cables typically require larger thread sizes (e.g., M16 for ≤12mm, M20 for ≤18mm), but consult manufacturer charts.

6. Additional Considerations

• Standards Compliance: Follow industry standards (e.g., IEC 62444) and manufacturer guidelines.
• Sealing and Strain Relief: Ensure the gland provides adequate compression without damaging the cable.

Example Workflow:

• Cable: 3-core armored, 2.5mm² cores, OD = 15mm (over armor).
• Gland Selection: Armored gland with OD range 12–18mm, thread size M20, and material suitable for the environment.

Key Takeaways:

• Always use cable glands manufacturer specific sizing charts for accuracy.
• Incorrect sizing can lead to sealing failures or cable damage.
• When in doubt, consult supplier specifications or technical support.

This method ensures proper sealing, strain relief, and compatibility with both the cable and equipment.

Nylon Cable Gland with Strain Relief

Our Nylon Cable Gland with Strain Relief is a high-performance sealing and fixation device designed to protect cable connections from environmental hazards such as dust, moisture, vibration, and mechanical stress. Made from durable nylon material, this cable gland combines lightweight construction with exceptional corrosion resistance, making it ideal for harsh industrial environments. Its integrated strain relief mechanism ensures secure cable retention, preventing pull-out and prolonging the lifespan of your electrical systems.

Key Features

1. Wide Compatibility

• Thread Standards & Sizes:

• PG Thread: PG7 to PG21 (European standard).

• Metric Thread: M12 to M27.

• NPT Thread: NPT1/4 to NPT3/4 (American tapered pipe thread).

• G Thread: G1/4 to G3/4 (ISO parallel thread).

• Cable Diameter Range: 3 mm to 18 mm, accommodating various cable types for power, signal, and data transmission.

2. Robust Strain Relief Design

Reinforced locking mechanism prevents cable slippage and protects against tension, torsion, and bending stresses.

Flexible sealing ring ensures a tight seal even with irregular cable surfaces.

3. Durable Nylon Construction

High-quality PA66 material offers excellent resistance to UV radiation, chemicals, and temperatures ranging from -40°C to +100°C.

Lightweight yet mechanically robust for long-term reliability.

4. Versatile Color Options

Standard colors: White and Black (suitable for most applications).

Custom colors available upon request to match equipment branding or environmental requirements.

5. Easy Installation

Split-design nut simplifies assembly without disconnecting cables.

IP68/IP69K protection rating ensures watertight and dustproof performance.

Applications

• Industrial automation control systems.

• Machinery, robotics, and motor connections.

• Renewable energy systems (solar, wind power).

• Outdoor LED lighting, telecom cabinets, and marine equipment.

• Chemical plants, food processing, and other corrosive environments.

Technical Specifications

• Material: Nylon PA66 (UL94 V2 flame-retardant grade).

• Temperature Range: -40°C to +100°C.

• Protection Rating: IP68/IP69K (submersion and high-pressure wash resistant).

• Certifications: RoHS compliant, REACH tested.

Customization Services
We offer tailored solutions for unique requirements, including:

• Special thread sizes or combinations.

• Custom cable entry/exit angles.

• Brand-specific colors or markings.

• Bulk packaging (economical for large-scale projects).

Why Choose Our Cable Gland?

• Global Standards: Supports multiple international thread types for seamless integration.

• Cost-Effective: Reduces maintenance costs by preventing cable damage.

• Adaptability: Perfect for retrofitting existing systems or new installations.

Nickel Plated Brass Blanking Plug

Nickel plated brass plugs are ductile and conductive. Nickel plating improves corrosion resistance, provides a smooth appearance and wear resistance. Used to keep out dust, dirt and moisture

Snap Bushing

The snap-on bushing is made of nylon 66, with high fire rating, oil and corrosion resistance. It is mainly used to plug the prepared holes on the housings of various cabinets, chassis, etc. It can be used as a preparation hole, or used to plug excess holes to maintain the appearance of the disk. To install, simply drill holes into the base plate and press the hole plugs in.