The main functions of the cable gland are listed briefly as follows :
•Cable Glands may provide environmental protection by sealing on the outer cable sheath, excluding dust and moisture from the electrical or instrument enclosure.
•Cable Glands may facilitate earth continuity in the case of armoured cables, when the cable gland has a metallic construction.
•Cable Glands may provide a holding force on the cable to ensure adequate levels of cable pull out resistance.
•Cable Glands may provide additional sealing on the part of the cable entering the enclosure, when a high degree of ingress protection is required.
•Cable Glands may provide additional environmental sealing at the cable entry point, maintaining the ingress protection rating of the enclosure with the selection of applicable accessories dedicated to performing this function.
•When used in Explosive Atmospheres they are required to maintain the level of protection of the equipment to which they are attached.
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.