Cable glands or connectors are used to fix the end of cables to the main part or machinery. This accessory is used at the point where one or many cables or wires enter the main equipment. It helps to distribute and reduce the strain on the cables through repeated bending, flexing and stretching. They're used extensively in telecommunications, electrical/electronic, instrumentation and automated systems. Additionally they can be used as sealing terminals so that the separation of cables is maintained. They may also have provisions for making electrical connections. They're also known as bulk-head modules, connectors etc. They can also provide earth continuity features.
Generally, the materials used to manufacture cable glands have to be hard-wearing and non-conducting, hence, plastics, brass, aluminum and stainless steel may be used. The type of material should be corresponding to the type of wires that are going to be used. Apart from electrical applications they're also used to seal off containers that carry explosive gases or liquids. In this case they could be fixed or sealed with special adhesives. They may also need to withstand a wide range of temperatures, ranging perhaps from -40C to 220C. If they're installing on equipment that stands outdoors, they also need to resist sunlight, moisture and weather conditions without breaking down. Some of them may be used in water-transportation facilities so they may be fitted with additional gaskets to ensure good sealing against leakage and also entry of dust and debris.
Various design options are available such as the right-angled type which may be used to fit equipments that are designed with side-connectors. Graduated and metric designs help to provide a good fit and grip.
Choosing the right type of cable gland depends on the function it is supposed to serve. The kind of cables or wires that will be used is also of prime importance. Exact specifications of the mounting hole shape, size, thickness and diameter must be assessed before purchasing the cable gland. The diameter of the gland should allow for future addition of wires in certain type of connections. If used in pressure applications, the amount of pressure that the gland can resist should be assessed.
Some variations that may be found in this sector are:
Fire-resistant/Explosion-prevention: These types of cable glands prevent the spread of fire or explosive situations by providing a barrier against it.
Grounding: These provide earthing features and can also reduce interference from electromagnetic and radio frequency waves.
Romex/Wire-mesh: Special cables like romex or non-metallic cables can be protected while they are routed into the equipment by the use of specially designed cable glands. Wire-mesh types provide better strain relief.
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