Cable gland | Cable gland type

Cable gland definition: a device that provides entry for a cable and mechanically attaches the cable to the enclosure for an electrical apparatus at the point of entry of the cable conductor into the enclosure. Cable gland is designed to seal hole of the enclosure.

Cable glands are configurable to work with any type of cable within a specified size range. They serve several functions including environmental protection (such as protection against dust and moisture) and additional sealing on the part of the cable entering the enclosure. They are able to facilitate earth continuity in the cases of armored cables, and provide a holding force on the cable to ensure adequate levels of cable pull out resistance. Cable glands can be used on all types of electrical power, control, instrumentation, data and telecommunications cables.

When choosing a cable gland there are several points to take in order to ensure the proper cable glad is used in the application. The first step is to identify the type of cable to be used and then check the construction, size, and material properties of the cable.

Cable gland also use for earthing, insulation, cable guarding, bonding, strain relief or a combination of above.

Cable gland also know as cable connector is design to secure and attach electrical cable to equipment like transmitter, switches, panel, junction boxes etc.

cable gland (also known as a cable connector or fitting) is a device designed to attach and secure the end of an electrical cable to the equipment.

Cable gland is used to seal encloser in hazardous area.

Cable glands also used to seal enclosure in hazardous area. For using in hazardous area Cable gland must meet with the same criteria as the enclosure to which they are connected. For example, cable glands used on an EEx‘e’ enclosure must meet the requirements  for the enclosures of the EEx‘e’

Glands are manufactured from nickel plated brass. The electroplated nickel helps to increase the hardness of the gland and to improve wear resistance.

cable gland

Cable Gland Type:-

There are at least three types of thread standards used:

  • Panzergewinde (PG standard)
  • Metric thread
  • National Pipe Thread (inch system)

Testing Procedures for Cable Glands

Cable gland that is used in industry should have complete test according given parameter.

  1. IP 66 Testing
  2. Continuity Testing of Armor
  3. Tork Test
  4. Load Test
  5. Impact Test
  6. Pressure Test

Cable gland Selection Criteria:

  • Environmental conditions (e.g. indoor / outdoor application, hazardous areas).
  • Cable type and voltage rating (armoured or un-armoured, and nr. of cores).
  • Actual cable diameter overall, and under armour.
  • Size and type of armour.
  • Accessories required (shroud/earth tag etc.).

 Applications:

  1. Rotary loose and fixed cone glands: for indoor use with steel/ aluminium wire armour cable.
  2. Compression glands: for indoor/outdoor use with un-armoured cable.
  3. Corrosion resistant glands: for use in highly corrosive or wet areas with steel wire armour cable.
  4. Nylon compression glands: for indoor/outdoor use with unarmoured flexible cable.
  5. Glands for hazardous areas: for indoor/outdoor use with armoured or un-armoured cable. Check the hazardous area classification.
  6. Flameproof glands: forindoor/outdoor use with steel wire armour cable. Check the hazardous area classification and explosion protection rating.
  7. High voltage glands: for PILC cable type armoured cable.

 Assessories:

The accessories available include PVC or rubber shrouds and slip-on earth tags. Also available are 4-way utility junction boxes (Size 1 & 2, IP68) that are able to accommodate size 1 or size 2 glands.

Specifications

Important specifications to consider when searching for cable glands include cable diameter, mounting hole diameter, and adjustable diameter.

  • Wire hole diameter is the maximum diameter of a cable or wire. This should be large enough to house all the cables in the system.
  • Pressure rating denotes the amount of pressure a device can withstand without leakage.
  • The number of wires the assembly can accommodate is important to consider.
  • Cable diameter specifies the diameter of the cable that can be fed through the cable gland.
  • Mounting hole diameterrefers to the diameter of the barrier or bulkhead hole into which the gland is to be installed.
  • The adjustable diameteris the diameter the cable gland can be adjusted to fit various sizes of cable. 

Applications

Common applications for cable glands include aerospace, cleanroom, fire protection, industrial, marine, panel or enclosure, power or utility, railway, and telecommunications.

Application Description
Aerospace cable glands Designed and rated for use on aircraft or space vehicles and/or equipment; may include applicable approvals for military and/or aircraft use.
Cleanroom cable glands Suitable for use in a cleanroom environment with the associated properties of maintaining positive pressure, prevention of dust and fluid ingress, etc.
Fire protection glands Designed and rated for prevention of fire propagation across the bulkhead or barrier.
Industrial glands Used in industrial environments such as factories, process plants, mills, etc.
Marine glands Designed for application on ships, offshore mining and drilling settings, or other marine applications.
Panel or enclosure cable glands Specifically designed and rated for penetration into electrical panels and/or electromechanical assembly enclosures.
Power and utility glands Designed for use with public utility equipment such as power transmission, distribution, and high voltage equipment.
Railway glands Designed for use on trains and associated installations.
Telecommunications glands Designed

Read Also

  1. Capillary Tube 
  2. Rotameter Working

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