Junction Boxes

Junction Boxes in Various Types and Sizes

On this page, you will find our complete selection of junction boxes in various types and sizes, which are used to facilitate a collection of cables or conceal this collection in a neat result.

Junction boxes come in many sizes and types, sometimes the junction boxes are called cable boxes and it can cover various types such as:

• junction box
• distribution box
• membrane box
• flush-mounted box

Fundamentally, a junction box is a junction box for connecting wires.

The junction box and distribution box are, in short, a box where you can connect wires or split wires in an electrical installation.

Junction boxes usually do not look alike; if you look at different models, some are round, others are square, and at the same time, there is a difference in where they can be used; some are for outdoor use and others for indoor use.

If you are unsure how to find the right junction box for your needs, read on below, where we have gathered some things you can look for.

5 Things You Should Know When Looking for a Junction Box

A junction box is not just a junction box; there are many models for different purposes and different placements, so we have gathered some things that might be good to know when you are looking for a new junction box.

#1 - Type of Junction Box

There are 4 types of junction boxes, and they all serve basically the same purpose, namely to connect wires and branches, but the method and classification may vary a bit from type to type.

Junction Box

A junction box is often made of hard plastic and has some small markings for where you can make a hole and lead wires into the junction box.

The junction box is a basic way to conceal the connection of wires so that you get a neater result than if the connections are left exposed.

Thus, the junction box serves to a great extent an aesthetic purpose, as it primarily contributes to preventing wires and connectors from hanging or lying freely, risking being stepped on or damaged.

The wires are led into the junction box and connected using connectors or terminal blocks, after which the lid is placed on the junction box, providing a nice finish to the electrical installation.

Distribution Box

A distribution box is very similar to the junction box, and often the name is also used interchangeably to describe a junction box.

However, the distribution box often has some entries with strain relief clamps, allowing you to branch and connect wires, so you do not need additional connectors, and at the same time, the wires are secured by the strain relief clamps.

This type is often used if several wires need to be connected and directed to different devices, for example, wires from 4 lamps, which should be connected into a single wire that can be mounted into the lamp socket.

Membrane Box

A membrane box is one of the most commonly used junction boxes and can be used for both branching and connecting wires.

The membrane box, like the distribution box and junction box, is made of hard plastic but has round membranes, which are easy to lead the wires through, and the membranes are placed either on the side or at the bottom of the box.

Typically, membrane boxes are also classified to be used outdoors, and this can be seen in the IP classification of the individual model.

The advantage of the membrane box is that it is spacious and relatively inexpensive, while the lid clicks into place and does not need to be screwed down like the other types.

At the same time, the membrane box also often provides strain relief for the wires, as well as various small parts located in the lid that can be used for sealing a broken membrane, etc.

Flush-mounted Box

The flush-mounted box is a bit different from the other 3 types, as it is the only one that is built into the wall and does not sit outside the wall like the others.

The flush-mounted box serves as a base for the installation of, for example, a socket, and ensures that the wires behind the socket have space and are secure.

This type does not have a lid or front, as it is often a socket that covers it and thus this type is not visible either.

#2 - Color

When you need to choose a junction box that will be relatively visible, for example, on a wall or in the ceiling, you might want the junction box in a specific color that matches the wall or ceiling.

Junction Boxes can be found in several colors, including:

• Anthracite
• Blue
• White
• Charcoal Gray
• Light Gray
• Off-White

The different colors mean that the junction boxes can blend into the surroundings a bit more and thus not be so visible.

#3 - Junction Box for Outdoor Use

When you need to use a junction box outdoors, it is important that it can keep moisture, water, and dirt away from the wire connections and therefore must be waterproof and dustproof.

You will often be able to see in the specifications whether the junction box is suitable for outdoor use, as it typically states that it is waterproof.

If you are in doubt, you can always take a look at the IP classification, which must be at least IP44 to be used outdoors.

However, most junction boxes for outdoor use typically have an IP class called IP55, which means that the device is waterproof against water jets from all angles and dust-proof.

#4 - Junction Box for Indoor Use

Junction boxes for indoor use are typically IP classified from IP20 up to IP55, as they do not require the same water and dust resistance as a junction box for outdoor use.

Therefore, almost all junction boxes can be used indoors, but if you need to install the junction box in a wet room, such as a bathroom or a laundry room, it may be a good idea to choose a junction box that is waterproof and thus has an IP55 classification.

This way, you are assured that no water will enter the connections and cause short-circuit damage to your devices.

You can also use junction boxes both on the ceiling and in the basement, so they are not visible unless you are in one of these places, and here it might also be a good idea to choose waterproof solutions, if nothing else, to keep moisture out of the installation.

#5 - Size and Design of Junction Box

You can find junction boxes in many different sizes, and even though you might be tempted to choose the smallest possible junction box, you should think about the space needed to connect the wires inside the box.

A small junction box leaves less space for fingers, connectors, and screwdrivers, while a larger junction box is easier to work with, but also takes up more space on the wall or ceiling.

Junction boxes come in square, rectangular, and circular designs, and what fits your needs best, you can probably best determine.

Circular junction boxes are often not very large and thus not so suitable for connecting multiple wires, such as the rectangular junction boxes.