CABLE GLAND SELECTION GUIDELINES

There are many factors to consider when selecting cable glands for industrial installations. Neglecting to pay due attention to some of these factors may cause unnecessary anxiety at a future point in time when the equipment and cables have been delivered on site, but for example the cable glands have either been forgotten to be ordered or it is discovered that they are the incorrect type or size at the very point when they are needed the most. Good advice would be to allocate some value added planning and preparation time to the subject of cable gland selection so as to avoid the great inconvenience which is likely to occur at a critical point in time. In the event that a user or contractor is in possession of a cable schedule that requires a cable gland selection and sizing process to be carried out, CMP Products would be more than happy to assist in carrying out this process at no cost to the enquirer. Please contact CMP Products for further information on this subject.
Here is a summary of some aspects to carefully consider when selecting cable glands.
  • Identify the type of cable to be used.
  • Check the construction, size & material properties of the cable.
When the cable is armoured, verify the following :-
  • Check the type and material of the cable armour (*)
  • Check the short circuit fault current rating of the cable armour(**)
  • Check the actual diameter of the inner bedding (where present) against the products featured on this website.
  • Check the actual diameter of the lead covering (where present) against the products featured on this website.
  • Check the actual size of the overall cable diameter against the products featured on this website.
  • Check the size and type of armour or braid (where present) against the products featured on this website.
  • Check any special environmental requirements in relation to corrosion protection.
  • Check the material of the mating electrical enclosures to eliminate dis-similar metals.
  • Consider whether any protective plating is required to be applied to the cable gland.
  • Check the type and size of the cable entry hole in the mating electrical equipment.
  • Check the ingress protection rating of the electrical equipment or site standard
  • Check whether a single seal or double seal cable gland is required.
  • Check whether an entry thread seal is required for IP66 (or IP67/IP68) conditions.
  • Check whether fixing accessories such as locknuts and serrated washers are required.
  • Check whether earth tags are required.(**)
  • Check whether shrouds are required.
  • Select a corresponding cable gland type from the products featured on this website.
  • For installations in Hazardous Areas, special considerations should be taken into account to ensure compliance with national or international codes of practice.
  • Check whether a thread conversion adaptor / reducer is required to make the installation.
  • Select corresponding adaptors or reducers from the products featured on this website.
  • Check whether any stopper plugs are required to close unused cable entries.
  • Select corresponding stopper plugs from the products featured on this website.

Note (*): If the cable armour is of a non standard material, e.g. Aluminium Wire Armour, it may be necessary to consider an alternative cable gland material, e.g. Aluminium.

Note (**): For certain medium voltage and high voltage cables where the fault current carrying capacity of the cable armour is greater than that of the standard earth tag it may be necessary to consider a cable gland utilising the CMP heavy duty Cast Integral Earth Lug (CIEL) option (i.e. E1W CIEL, E2W CIEL, BWL CIEL, CW CIEL).