Cable Glands for cable size; Flameproof and weather proof glands

Cable Glands: Types, Applications, and Industrial Standards

Cable glands are an essential component in electrical and instrumentation installations. They provide mechanical support, environmental protection, and safety for cables entering panels or enclosures.

---

Functions of Cable Glands

Cable glands are used for the following purposes:

1.      Strain relief – Prevents tension and stress at cable termination points.

2.      Earthing and grounding – In case of armored cables, they ensure effective bonding.

3.      Cable entry – Provides safe and sealed entry into electrical panels, junction boxes, and enclosures.

---

Types of Cable Glands

Different types of glands are used based on cable type and application:

1.      Indoor Glands (Brass material) – For general indoor use.

2.      Outdoor Glands (Brass material) – With weather protection.

3.      Unarmored Cable Glands (Brass material) – For non-armored flexible cables.

4.      Weatherproof / Flameproof Glands (Brass material) – For hazardous and industrial environments.

5.      PG Threaded Glands – German standard glands with PG threads for light applications.

---

Single Compression vs Double Compression Glands

Aspect	Single Compression Glands	Double Compression Glands
Support	Suitable for light armored cables	Suitable for heavy armored cables
Sealing	Compression at one point (armor only)	Compression at both armor & inner sheath
Protection	Limited sealing (vapors may enter)	Weatherproof & Flameproof
Construction	Body, gland nut, rubber seal, rubber washer, check nut, washer	Body, gland nut, cone, cone ring, rubber seal, rubber washer, check nut, washer
Applications	General industrial use	Hazardous areas (oil, gas, refineries)

Cable Gland Size Selection for Armored Cables

In industries, armored cables are most commonly used. Cable gland sizes are standardized for weatherproof and flameproof applications.

Standard Cable Gland Selection Chart

Cable Size	Approx. Diameter (mm)	Weatherproof Gland	Flameproof Gland
4C x 1.5 sq.mm	16.5	CBW01S	CBF01S
4C x 2.5 sq.mm	17.0	CBW01	CBF01
4C x 4 sq.mm	19.5	CBW02	CBF02
4C x 6 sq.mm	21.5	CBW02	CBF02
4C x 10 sq.mm	21.5	CBW03	CBF03
3.5C x 25/16 sq.mm	26.0	CBW04	CBF04
3.5C x 35/16 sq.mm	28.5	CBW05	CBF05
3.5C x 50/25 sq.mm	32.0	CBW06	CBF06
3.5C x 70/35 sq.mm	35.0	CBW07	CBF07
3.5C x 95/50 sq.mm	40.0	CBW08	CBF08
3.5C x 120/70 sq.mm	43.0	CBW09	CBF09
3.5C x 150/70 sq.mm	46.0	CBW09	CBF09
3.5C x 185/95 sq.mm	50.0	CBW010	CBF010
3.5C x 225/120 sq.mm	58.0	CBW011	CBF011
3.5C x 240/120 sq.mm	59.0	CBW011	CBF011
3.5C x 300/150 sq.mm	64.0	CBW012	CBF012
3.5C x 400/185 sq.mm	72.0	CBW013A	CBF013A

Applications in Hazardous Areas

·         Weatherproof Double Compression Glands – For outdoor and industrial non-hazardous areas.

·         Flameproof Double Compression Glands – Mandatory in hazardous environments like oil & gas plants, refineries, chemical industries, where explosion protection is critical.

---

✅ Key Takeaway:

·         Use single compression glands for light-duty and indoor armored cables.

·         Use double compression glands for heavy-duty armored cables, especially in hazardous or outdoor conditions.

·         Always select gland sizes based on cable core and overall diameter for safety and compliance.

⚠️ Disclaimer: The gland selection chart provided is indicative and based on standard industrial practice. Always refer to manufacturer datasheets and site-specific engineering requirements before finalizing gland sizes.

---