Cable glands for holes

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Glands for bore holes

Glands for holes are used when running cables through walls, furniture or other hard surfaces. They are also used in holes in electrical equipment housings. Their purpose is to stiffen the cable in place through an obstacle and to seal the cable entry. They are also a protection against crushing or abrasion. They are also an important protection against accidental pulling out of the wall or device. Due to their universal application, cable glands are used for example in machine building, agriculture or the food industry.

Glands for holes and holes - types

Glands for holes are also called cable glands or cable grommets. It is one of the basic components of mechanical engineering or cable management systems. Grids for holes must be made of materials resistant to high force or various shocks. Such products must be made of self-extinguishing materials. Therefore, very often they are manufactured from various plastics - most often it is polyamide. Glands of this type are used wherever emphasis is placed on protection against vibration. In the case of glands made of rubber, their greatest advantage is high flexibility - which is a great protection against disturbing the insulation layer and damage to the cable.

When it comes to metal glands, we mainly meet elements made of brass or stainless steel. In case of using the gland in harsh industrial conditions, it is necessary to use elements made of e.g. steel covered with acid resistant coatings.

A very important parameter of the gland for holes is the degree of tightness in the IP scale. Most often such products offer protection level IP68. This means that the conduit is completely dustproof, and at the same time protects against the penetration of water - even in the case of prolonged immersion. You can also find glands with a higher level of protection - e.g. IP69. Such elements can even be mounted in machines that are washed with hot water under pressure.

The most common are threaded glands, in which sealing takes place by tightening a rubber seal. Diaphragm seals, on the other hand, are based on a pressure connection. They are used, for example, in switchboards and boxes. Their great advantage is their flexibility. Stub shaft gland surrounds the cable with a sealing layer. Such a grommet is characterized by high resistance to dust and dirt, but does not seal against water.

Grommets for holes - accessories

However, hole glands are just one of the items used when running cable routes through holes. There are also various accessories available that are used for finishing holes or sealing grommets, for example.

Sealing inserts of all kinds are very important. They serve as protection against the penetration of liquids and dust into the gland. They are also used for unused grommets.

If the cable gland is not used (cables have been removed from it), it should be properly finished. For this purpose, various plugs are used. They can be made of various materials - most often it is polyamide, polystyrene or brass. Very often they have a threaded design, in which case they are installed by screwing them in with a flat or Phillips screwdriver. If they do not have a threaded finish, they are simply mounted by pressing them in.

In the case of a hole gland, which has too large a diameter, there are various inserts and reduction rings. A popular solution are also inserts separating individual cables from each other - in this situation you can count on very good protection for each cable.

If there is no need to ensure water- or dust-tightness when passing cables, open vias are used. This type of elements are only to protect cables from contact with sharp edges - but they do not offer any protection against external factors.