Introduction to Cable Glands

Cable glands are used to terminate electric cables to electrical equipment or electrical enclosures. Cable glands are essential to be fitted for the majority of electrical installations. The selection of gland type depends on a number of factors:

  • Type of installation: domestic, commercial or industrial
  • Indoor or outdoor environment
  • Explosive atmosphere
  • Corrosive atmosphere
  • Cost

Cable glands are ‘critical safety’ devices in the overall electrical system of a plant or installation. The importance of selecting and using the correct cable gland type cannot be overlooked. There are various types of cable glands from the basic ‘A’ type gland right through to the compound barrier gland.

Types of Industrial Cable Glands

BS 6121 specified requirements for the design and construction of cable glands and gave type designations to glands.

The following designations are sometimes used by cable gland manufacturers in their product codes. The basic designations of the glands where as follows:

  • Type A1. For unarmoured cable with an elastomeric or plastic outer sheath, where the function of the gland is to secure the outer sheath of the cable.
  • Type A2. As type A1, but with an IP68 seal between the outer sheath and gland.
  • Type A3. As type A1, but with an electrical bond for the metallic inner sheath.
  • Type A4. As type A2, but with an electrical bond for the metallic inner sheath.
  • Type B. For armoured or wire braid cable, where the function of the gland is to secure the armour or metallic braid and to provide electrical continuity between such armour or braid and the threaded fixing component of the gland.
  • Type C. For armoured or wire braid cable with elastomeric or plastic outer sheath. As type B, but with an IP68 seal between outer sheath and gland.
  • Type D1. For armoured or wire braid cable with elastomeric or plastic outer sheath. As type B, but with an IP68 seal between inner sheath and threaded fixing component.
  • Type D2. As type D1, but with an electrical bond for the metallic inner sheath.
  • Type E1. For armoured or wire braid cable with an extruded elastomeric or plastics inner sheath and elastomeric or plastics outer sheath. As type C, but with an IP68 seal between inner sheath and gland and between the inner sheath and threaded fixing component.
  • Type E2. As type E1, but with an electrical bond for the metallic inner sheath.

Glands of type B, C, D1, E1 and E2 are suitable for armoured or wire braided types of protection shall be identified by a suffix, added to the designation, to indicate the type of protection for which the gland is suitable. The suffix for each type of protection shall be as follows.

Single wire armouredW
Pliable wire armoured flexibleT
Wire braidedX
Aluminium strip armouredY
Double steel tape armouredZ

Cable Gland Types

Cable Glands ‘A’ Type

‘A’ type glands more commonly known as ‘stuffing’ glands. There are two types of ‘A’ gland. A1 and A2, A1 is retained on the cable whilst the ‘A2’ gland seals and retains on the cable.

  • Suitable for unarmoured, plastic or rubber sheathed cables.
  • Indoor and outdoor applications.
  • For unarmoured, plastic or rubber sheathed cables.
  • Suitable for most indoor and outdoor applications.
  • Plastic or brass
  • Seal rated to IP68 (A2 version)

A1 Cable Gland – Plastic only (IP4X) non-certified version only.

A2 Cable Gland – Plastic and/or brass (IP68) non-certified and certified versions available.

Cable Glands ‘B’ Type

Suitable for single wire armoured, plastic or rubber sheathed cables.

  • Application – for use in dry, indoor situations only.
  • Brass only
  • IP30

Cable Glands ‘C’ Type

Suitable for cables that are:

  • Plastic or rubber sheathed
  • Extruded or lapped bedded
  • Armoured or braided
  • Outer seal grips sheath of cable
  • Seal rated to IP68
  • For use in most climatic conditions weatherproof and waterproof.
  • Brass or Stainless Steel
  • Design has separate armour locking ring.

Cable Glands ‘E’ Type

Suitable for cables that are:

  • Plastic or rubber sheathed
  • Extruded or lapped bedded
  • Armoured or braided
  • Outer seal grips sheath of cable
  • Inner seal grips bedding layer of cable
  • Inner and outer seal rated to IP68
  • For use in most climatic conditions weatherproof and waterproof.
  • Brass or Stainless Steel Design has separate armour locking ring.