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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 armoured	W
Pliable wire armoured flexible	T
Wire braided	X
Aluminium strip armoured	Y
Double steel tape armoured	Z

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.