Energy input pattern, energy meter is for some people the name given to the input pattern is the general switch, referring to the general circuit breaker of the pattern. Regardless of the name used, when it comes to energy input pattern many doubts arise! It is a single-phase input pattern, two-phase input pattern, three-phase input pattern, how to choose?
The entry standard is assembled according to the concessionaire: CEMIG, CELESC, CPFL, COPEL, etc. This equipment connects the utility’s energy to the properties. And a very recurring question is whether you can have two-phase and three-phase standard boxes, for example, in the same territory, when we have more than one installation, that is, more than one house. It was thinking about this doubt that we brought this article that will talk specifically about single-phase, two-phase and three-phase patterns in the same pattern system, come on guys!
Input pattern and a number of phases!
Is it possible to have single-phase, two-phase and three-phase input patterns on the same set of meters? The answer is yes! The example that we are going to show here is of the meter standard here in the World of Electrical, in this case, we have 4 different installations on the same terrain and each one with its own standard. Here in the World of Electrical, we need a three-phase installation to be able to connect motors for example. Therefore, there is a three-phase standard for our installation and the other installations are biphasic.
In the single-line diagram of the standard design, you can see that the installation has a 60A three-phase circuit breaker for the 84C house and the other installations are all bipolar, one 60A and two 40A, as shown in the image below. In the case of an entry standard with more than 3 meters, it is considered as a collective standard and a project with a general box for the standards and an ART for the entry standard will be required. In the image it is also possible to see the three-phase 120A circuit breaker with 10kA short circuit current that was installed in the main box.
To perform the installation of the entry standard, the rules of the concessionaire serving the consumer must be followed, in our case here is CEMIG and it follows the ND 5.2 standard. But it is important to understand that each dealership has its own specific rules, so you should research what these dealership rules are in your region.
The distribution layout of the boxes follows the scheme for up to 6 consumer units set out in the dealer’s norm, in this case alternative B for distribution of the boxes. In the image below it is possible to see the drawing in the project and the distribution layout also shows the need to install 3 earthing rods, this amount is stipulated by the concessionaire.
In general, the installation and development of entry pattern designs are basically reading and interpreting the concessionaire’s rules. It is very important to know and know how to read an electrical project well. Standard designs end up looking complex to electricians due to the great difficulty that some have in reading electrical designs.
If you want to go deeper into the subject or have any doubts, check out this video from the Mundo da Elétrica channel below, it shows didactically everything we talked about in this article.
Before finishing we want to leave a very interesting tip! A lot of people call the meter input standard, but this is wrong and we will explain the reason. The input standard is the set of installations composed of: measuring box, that is, the meter is one of the components of the input standard. In addition to it we still have the grounding system, conductors, and other essential accessories for the dealership to make the connection.