Home Glossary Resources

Armoured Cable Glands

Why Do We Use Cable Glands?- To firmly secure cable entering a piece of equipment

- To maintain the ingress protection of the piece of equipment (minimum of

IP54 for 'e' and 'n' type enclosures. Where the enclosure wall thickness is

less than 6mm a sealing washer or thread sealant will be required to

maintain IP54 protection)

- To maintain earth continuity between a piece of equipment and any

armouring in the cable

- To ensure containment of an internal explosion in flameproof equipment

Is There a British Standard for Cable Glands?The Code of Practice for selection, installation and inspection of cable

glands used in electrical installations is covered in BS 6121-5 1989

Mechanical cable glands.

Selecting Cable GlandsItems to consider when selecting a cable gland for a particular installation

include:

- Possibility of electrolytic action between the gland and the enclosure.

Shortened lifetime for the glands and the cable entries can result if

incompatible materials selected. The most common materials used are brass,

stainless steel and plastic. Material choice will influence cost.

- Degree of Ingress Protection required. See our page on IP ratings.

- Certification of gland for use in Hazardous areas

- Normal or barrier gland required

- Size of cable being terminated

- Size of cable entry on piece of equipment

What is a Barrier Gland?Barrier glands are similar to normal glands, except a compound sealant

material is used to ensure the inside of the cable is gas tight as well as the

outside.

When Should a Barrier Gland be Used?BS EN60079-14 Electrical Apparatus for Explosive Gas Atmospheres Part

14 - Electrical Installations in Hazardous Areas (other than Mines) provides

a selection process for deciding if a barrier gland is required. There are

various options to consider, however if the hazardous gas require IIC

apparatus, or if the volume of the enclosure is greater than 2 litres then it is

likely you will need to use a barrier gland. IIC apparatus is generally

associated with Hydrogen.

Gable Gland SizingA rough gland sizing table is provided below, however reference should be

made to the British Standard referenced above.

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Further Reading

IEE Wiring

Regulations:

Explained and

Illustrated

C&I Resources

ATEX

Cable Gland Selector

CE Marking

Flange Dimensions

Ingress Protection

Pipe Schedules

Relief Valve Orifice Size

Temperature Class

Temperature Conversion

Thermocouple Types

Valve Leakage

Vortex Meters

Wires and Cables

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Nominal

Conductor

Area (mm2)

Number of cores

1 2 3 4 5 7 10 12 19 27 37 48

1.5 -- 20S 20S 20S 20S 20S 20 25 25 25 32 32

2.5 -- 20S 20S 20S 20 20 25 25 25 32 41 40

4 -- 20S 20S 20 20 20 25 25 32 40 -- --

6 -- 20 20 20

This chart is for guidance only.

Consult relevant British Standards

before making final selection.

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 50 63 63

300 40 63 63 75

400 50 63 75 --

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Equipment and

Installations in

Hazardous Areas

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Consultancy

Design, Approval

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