Cable glands are defined as "mechanical cable entry devices" used with cables and wiring in electrical, instrumentation and control, and automation systems, including lighting, power, data, and telecommunications.
The primary function of a cable gland is to act as a sealing and termination device to ensure protection of electrical equipment and enclosures, including providing:
Environmental Protection - Remove dust and moisture from electrical or instrumentation enclosures by sealing the outer cable jacket.
Earth Continuity - In the case of armored cables, when the cable splice has a metallic construction. In this case, the cable glands can be tested to ensure they can withstand the appropriate peak short-circuit fault current.
Holding force - Ensure adequate level of mechanical cable "pull out" resistance on the cable.
Additional sealing - when a high degree of protection is required, on the part of the cable entering the enclosure.
Additional Environmental Sealing - At the cable entry, the protection rating of the enclosure is maintained by selecting the appropriate accessories designed to perform this function.
Cable glands can be made of metallic or non-metallic materials (or a combination of the two) that also have corrosion resistance determined by selection criteria or through corrosion resistance testing.
Especially when used in explosive atmospheres, cable glands must be approved for the chosen type of cable and they must maintain the level of protection for the equipment they are connected to.
HOW TO CHOOSE A CABLE GLAND
With so many different cable connector features and designs to sift through, it can be challenging to determine which type of cable gland to use for a specific application and what features to look for. The key to making this choice is to identify the application’s needs first and then eliminate cable fitting options using this information. Some key questions to ask when selecting a cord grip include:
What is the nature of installation — domestic, commercial or industrial?
Will the cable gland be in an indoor or outdoor environment?
What are the temperature conditions for the environment, and how much will they fluctuate?
Will the cable gland be exposed to moisture, dust, dirt or corrosive elements?
Will there be any risk factors in the environment, such as an explosive or corrosive atmosphere?
What is the cable size, and does it feature any armoring? If it does have armor, what type?
Once you have narrowed down your cable gland options to suit your application’s needs, you can then make a final decision based on cost.
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