Do you know what industrial sockets and plugs are? Why do industrial outlets have different colors? In this article Mundo da Elétrica talks all about industrial plugs and sockets, an electrical component that many people have asked us to talk about.
Industrial Plugs and Sockets
Many of you may have seen an industrial plug and socket in some stores or small factories, and for those who do not know the industrial plugs and sockets, in the image below we have 16A and 32A industrial plugs and sockets. The main feature of industrial plugs and sockets is that they are made to work with higher currents.
Industrial plugs and sockets are used in various areas of the industry and on various machines such as bench drills, milling cutters, belts, lathes, etc.
In plugs and sockets for residential use there are sockets of 10A and 20A, in the case of plugs and industrial sockets these values can be from 16A to 125A. Another difference is that industrial outlets follow another standard. While residential outlets have NBR14136, industrial outlets have the NBR IEC60390 standard.
Industrial sockets, which are the part connected to electrical power, are also called by many female sockets, are manufactured to be installed in three different ways.
The first is the overlapping industrial socket, which allows the industrial socket to be fixed to the wall or to a structure, leaving most of its body visible.
In order to install the overlapping industrial socket, the first step is to open the protective cover of the socket, remove the screws and detach the cover that has a groove to facilitate the fitting. This channel also makes the structure of the socket much firmer. The socket can be fixed to the structure through four holes in its base.
The cable can enter through a cable gland at the rear of the socket, where it has a threaded hole, or at the bottom where the socket already comes with a pre-cut to facilitate drilling.
The second model is the recessed socket that only the part of the socket for the plug is visible. To install the recessed socket we need a base with a hole with the same diameter as the socket. The recessed socket comes with a rubber seal and has four holes for fixing.
Recessed sockets are usually installed on benches or tables, thus facilitating the connection of mobile machines.
The third is the coupling socket, which has no fixation on walls or structures, the socket is attached to the end of the cable and can be used for the creation of industrial extensions.
The great differential that makes our model of coupling socket and mobile plugs, is up to 40% faster to be installed than the others available in the market. Both are secured by a simple locking system that ensures ease of opening and closing, that is, it guarantees fast, practical and very secure closing.
To open the socket coupling and movable plugs, simply tighten with a screwdriver in the indicated location and turn the socket head or plug counterclockwise and you’re done. Thus having access to the contacts that hold the cables to the head.
To close it, just fit the two parts in the correct position, then turn clockwise until you feel the lock click.
The mobile plug is the part that is connected to the device or machine. And both the mobile plug and the coupling socket, it comes with a cable gland in the plug and socket that keeps the cable very tight.
To attach the cables, just plug the cable into the cable gland and turn the cable gland clockwise, so the cable is secured providing more security.
To release it, just turn it counterclockwise, but it is possible to open the cable gland it is much more difficult than closing it, and this was done on purpose to prevent the day-to-day vibration, the falls of the socket or the plug making the cable gland will loosen over time.
The pins on the male plug are firmly attached to the plastic part, even if the pins are pushed, they do not release, in addition, both the pins and the socket for the pins in the sockets are nickel-plated, this does not allow dust to accumulate on the surface and greatly reduces wear the pin. Because it is more rigid than copper or brass, this greatly improves electrical contact and ensures that plugs and sockets are much more durable.
In the part of contact with the cables, both in the socket and in the plugs, the angle that the screws are arranged facilitates the fitting of a screwdriver to tighten and loosen the screws. In the case of an overlapping socket, for example, it is not necessary to remove the head from the socket body in order to tighten the cables.
In all sockets the screws are well protected from undue contact, precisely to prioritize safety.
We know that according to NR10 , the live parts of the components have to be as protected as possible, that is, these outlets meet this standard requirement. In addition, these outlets also follow another important requirement of the NBR IEC 60309 standard, which requires that all of this plastic material in the outlets be flameproof.
Another important differential of some industrial sockets and plugs is that the standard requires that only the plastic parts with direct contact with the energized parts are made of flameproof material, but for greater safety, all plastic parts of the socket and plug are manufactured with flameproof material. .
Industrial sockets and plugs have three pin quantities according to the use, which is 2P + T for two phase or phase and neutral pins and one for ground. 3P + T which are three phase pins or two phase, one neutral plus earth and 4P + T for three phase cables one neutral and one earth.
The ground pin is always arranged in two positions, at 6 am and 9 am. If you open any industrial outlet you will see that it has a safety tab to prevent the wrong voltage plug from being inserted into that outlet.
Looking at the plug from the front and placing the safety guide down, we can see that the position of the ground pin can be in some sockets at 6 am or at 9 am in other sockets. So to avoid mistakes, just imagine a clock on the socket and remember the position of the socket hands.
Sockets and plugs have different colors according to the installation voltage. Usually in blue and red, where the blue color is for 220V and red is for 380V.
This is one of the requirements of the standard with regard to safety, a red plug will never fit into a blue outlet, as the time position as already shown will be different.
Depending on the electrical current in use, the size of the socket also changes to avoid fitting it into a different socket. Note in the image below that a 16A plug is smaller than the 32A plug.
Regardless of the manufacturer, these plugs and plugs follow an international standard. So, a plug of the right voltage and the right current will fit into an outlet made by another manufacturer, precisely because it follows the standard.
The protective cover has two important roles in the outlets, in addition to protecting against the entry of particles, it also acts as a security lock.
After connecting the plug to the socket, the socket cover fits the protective lock of the plug, preventing it from being released in a fall or if the cable is stretched. All of this is important to avoid bad contact.
A problem with industrial sockets is that the protective cover sometimes loosens because the socket on the socket was plastic. In this model the socket cover is made of metal, to ensure even greater durability, this is a point that must be observed by the professional when buying the electrical material.
Are industrial plugs and plugs more resistant?
In order to show how the fittings of industrial sockets and plugs are resistant, we decided to mount an extension between a plug and a coupling socket. See the image below, that in our test we put enough force to loosen the connection between the socket and the plug and we were not even able to loosen the connection.