Why are we using cable glands on cables? How many types of cable glands are we use in the electrical industrial sites? What are the sizes of cable glands used in the electrical construction? You will get an answers for theses questions from this article. So, don’t skip and read completely.
Table of Contents
What is a Cable Gland?
Cable gland is designed to permit the entry of cable in to electrical equipment or component which provide earthing, grounding, bonding, insulation, sealing, retention and strain relief. It provides mechanical supports for cables.
Glanding and termination are a major work to the electricians while constructing a site. There are various types of glands are used in the oil and gas areas. There are two types on industrial cable gland. One is single compression glands. Another is double compression glands.
Electricians must use a proof type of gland in an abnormal situation, such as flame-proof, explosive proof, fire proof.
In small type of industries, we should have to use single compression glands. We commonly use double compression glands in the plants and large size construction areas.
Part names of single compression glands are check nut, gland body, washer, ring and compression nut.
Part names of double compression glands are gland base, entry body , ring, cone and washer.
Types of Cable Glands : Single and Double Compression Cable Gland
There are four types of glands are used in the electrical construction. Single compression gland should be only used in the small type industries. Double compression glands should be only used in the plant.
Flexible hose glands are used in the heat areas. PVC glands are used for the control cables. Purpose of use of this gland for mechanical support and earthing.
Parts name – Body, washer, nut, ring and cone.
The four type of glands, classified by construction method. These are, 1. Single compression 2. Double compression 3. Flexible hose 4. PVC.
Single Compression Cable Gland
This type of glands are commonly used in buildings and small industries. We should use single compression gland for the flat armored cables. There are three types of single compression glands available in electrical industries. They are,
- Single compression light duty
- Single compression weather proof 3. Single compression flameproof
Double Compression Cable Gland
In power plant and oil and gas plants, we use double compression. We should use double compression gland for the round armored cables. Three types of double compression glands are used in electrical industries. They are,
- Double compression light duty
- Double compression weatherproof
- Double compression flameproof
Flexible Hose and PVC Gland
PVC glands are commonly used for the control cables in the instrumentation field. Flexible hose glands are used in the heat areas.
Correct Selection of Cable Glands
Gland should be selected on following factors,
- Type of cable (Armored and Unarmored)
- Size of gland
- Entry permit type or thread description
- Circumstance (Normal or abnormal situation)
- Manufactured material
6 Types of Cable Gland
There are 6 types of glands are used in the construction sites. They are,
- Brass indoor type gland
- Brass outdoor type gland
- Brass straightening unarmored gland
- Brass weatherproof
- PG threaded gland
- Industrial gland
Brass Indoor Type Gland
The gland is good handling in use with different types of cable whether plastic, rubber, metal or any other. This type of glands are used in dry indoor areas and used with all type of single wire armored cables, plastic or rubber sheathed cables. Brass indoor gland suitable for single wire armored, plastic or rubber sheathed cable. We should have to use shroud for ingress protection. We use this type for SWA armored cables.
Brass Outdoor Type Gland
This type is made by high quality material for use in outdoor purpose with different types of cables sheathed or unsheathed. Brass indoor and outdoor glands commonly used with single wire armored(SWA). Plastic or rubber or metal sheathed cable. Terminates and secure cable armoring and outer seal grips sheath of cable thus ensuring mechanical support and earthing. Use shroud for additional protection.
Application : Outdoor or indoor, for use with all type of single wire armored cables, plastic or rubber sheathed cable. Popularly used for SWA, plastic of rubber sheathed cables. Used in dry indoor conditions.
This type gland sizes are 20, 25, 32, 40, 50, 63, 75 75 mm (S , L and M)
Additional materials: earth tag, PVC shroud, rubber, washer, brass lock nut. Cable type: wire braid armor.
Brass Straitening Unarmored Gland
This type of glands are used for different type of unarmored or rubber sheathed cables. Brass indoor and outdoor gland suitable for all types of unarmored cables, plastic or rubber sheathed cables.
Applications: used on unarmored and plastic insulated cables. Indoor & Outdoor wherever it is required to provide sealing on cable outer sheath.
Various sizes are 20, 25, 32, 40, 50, 63, 75 75 mm (S , L and M).
Additional materials: earth tag, pvc shroud, rubber, washer, brass lock nut. Cable Type: wire braid armour.
Brass Weatherproof Gland
This type electrical gland is used precisely with armored different types of SWA cables (electrical full form is Single Wire Armour) whether plastic or rubber sheathed ones. This type gland is known for its uninterrupted services once the gland is fixed to the cables.
This is suitable for single wire armour or rubber sheathed cables. Outer seal grips bedding layer of cable for use in most climatic situations. Manufactured in various proof type like weatherproof and waterproof. It has a separate armour lock rings.
Application: In Outdoor or indoor, for use with single armored, all type of SWA cable, plastic or rubber sheathed cable. It is also available in weatherproof and waterproof. Inner and outer sheath.
Cable type: Steel Wire Armour (SWA).
Various sizes are 20, 25, 32, 40, 50, 63, 75 75 mm (S , L and M)
PG Threaded Gland
The type is a custom made threaded gland to meet the needs from the industries.
Industrial Gland
Industrial brass glands suitable for wire braid armored, plastic or rubber sheathed cable. Terminates and secure cable armoring and outer seal grips sheath of cable thus ensuring mechanical strength and earth continuity. For additional protection use PVC shroud.
Various sizes are 20, 25, 32, 40, 50, 63, 75 75 mm (S , L and M).
Cable type: Wire Braid Armour.
Brass gland suitable for steel tape armored, plastic or rubber sheathed cables.
Cable Gland Size Chart
| CORE | ||||
| CABLE | 1 | 2 | 3 | 4 |
| 1.5 | – | 20S | 20S | 20S |
| 2.5 | – | 20S | 20S | 20S |
| 4 | – | 20S | 20S | 20 |
| 6 | – | 20 | 20 | 20 |
| 10 | – | 20 | 25 | 25 |
| 16 | – | 25 | 25 | 25 |
| 25 | – | 25 | 25 | 32 |
| 35 | – | 25 | 32 | 32 |
| 50 | 20 | 32 | 32 | 40 |
| 70 | 25 | 32 | 40 | 40 |
| 95 | 25 | 40 | 40 | 50 |
| 120 | 25 | 40 | 50 | 50 |
| 150 | 32 | 50 | 50 | 63 |
| 185 | 32 | 50 | 50 | 63 |
| 240 | 40 | 63 | 63 | 63 |
| 300 | 40 | 63 | 63 | 75 |
| 400 | 50 | 75 | 75 | – |
| CABLE | GLAND | SIZE | SELECTION | TABLE |
Final Word
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Single compression glands are mostly used in building construction. But double compression glands are used oil and gas areas. What is the difference between two cable glands?
Cable gland selection chart is varies depending upon gland type and condition…
This is very useful to us. thq.
This is good information
Cabel galande