Reduction extension ring

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Expansion/Reduction Ring

The Extension/Reduction Ring is used for cable glands. It makes it possible to insert a gland with a smaller diameter into a box or distribution board with a larger opening. Such an expanding or reducing ring may be needed when building an electrical installation or servicing it.

Application of glands

When running cables through various types of hard surfaces - such as walls, furniture or electrical equipment housings - glands (also known as cable grommets or glands) are used. These elements are responsible for sealing, stabilizing and securing the cables in the place of passing through the given obstacle. Installation of the gland in the hole is done by twisting its elements on both sides of the hole. It is extremely important that the elements are perfectly matched with each other - only in this way can ensure a tight connection. However, it may turn out that the hole is too wide or too narrow for the gland. In this case, a variety of rings - expanding or reducing - are used.

Reduction and Expansion for cable entry

Expansion/reduction is a name that refers to two types of products. On the one hand it refers to reducing elements and on the other hand to expanding elements. The use of a suitable ring depends on the specific situation found. If the opening in a box, switchboard or housing of other electrical equipment is too wide in relation to the gland you have - you should use reduction. This will make it possible to install the conduit in the installation - ensuring its solid installation and protection against vibration. However, it may happen that the gland is wider than the hole in the casing. In such a situation, an expansion ring should be used. Installation of such an element is extremely simple. It is enough to screw it into the thread of the device housing. Then - after obtaining a suitably widened or narrowed hole - the gland should be mounted.

Choosing an expansion or reduction ring

The range of rings is varied. The most important difference relates to the fact that some of them allow you to expand the hole, while others allow you to reduce it. However, when choosing products in this category, you need to look at other issues as well.

The material from which the element is made is important. In case of products that must have high resistance to mechanical damage, brass or steel rings are usually chosen. When the cable culvert is used indoors, polyamide rings are definitely more often used.

When choosing a ring it is necessary to look carefully at the dimensions. They can be presented in inch or metric system. In Poland and Europe the metric designation prevails.

When buying a ring used for reduction or expansion, you should also get a suitable gasket and nut. In most cases they are not included in the set.

Reducing/expanding ring - how to read the markings?

There is a wide range of expansion and reduction rings available. It is possible to obtain various combinations of external and internal dimensions. When choosing such elements, it is necessary to look carefully at their markings. Therefore, how to read e.g. M30/M25 107?

The first dimension refers to the width of the hole found. It is into this hole that the reduction ring will be screwed. The second dimension refers to the size of the hole after the reduction. The letter M before the given dimension suggests that the dimensions will be given in the metric system - in millimetres. In the case of the M30/M25 107 reduction ring, we are dealing with a component with an external thread diameter of 30 mm and an internal thread diameter of 25 mm.

In the case of an expansion ring, we are dealing with rings with a designation such as M25/M30 107. It becomes clear at a glance that the first dimension is smaller than the second. Therefore, an expansion from a thread with a diameter of 25 mm to 30 mm will take place here.

And what does the number 107 stand for? This is already the model number given by the manufacturer. In this case, it refers to the 107 series offered by the Obo Bettermann brand.