Practical guide for medium voltage installations

After all, it ensures the safe and efficient supply of electricity, connecting the public distribution system to the internal networks of buildings. More than power, it requires technical knowledge, suitable equipment, and compliance with specific standards.

In this guide, we will objectively explain what a medium voltage installation is, its main components, and the regulations that guide this type of system. Let's get started?

What is a medium voltage installation?

Medium voltage covers the range from 1 kV to 36 kV, being widely used to supply large energy consumers. Unlike low voltage installations (residential or small commercial), medium voltage is capable of meeting high demands with less energy loss and more stability.

In this type of installation, the electrical distribution network carries energy to the consumer's substation, where the transformation to low voltage occurs, making it compatible with internal use. This configuration reduces voltage drops, ensures greater efficiency, and allows the continuous operation of large machines and equipment.

Because it is a more complex system, the medium voltage electrical installation must be designed and executed by qualified professionals, strictly following technical and safety standards.

In addition, the use of appropriate Personal Protective Equipment (PPE) is essential to preserve the integrity of the workers involved.

Discover its main components

A medium voltage installation involves a set of equipment and devices that work in an integrated manner to ensure safety, control, and efficiency. Among the main ones are:

Cables and conductors: responsible for conducting electrical energy, sized to withstand high voltages and currents, with proper insulation;

Disconnect switches: allow the manual shutdown of parts of the system for maintenance or operational switching;

Medium voltage circuit breakers: protect the installation against overloads and short circuits, automatically interrupting the circuit;

Transformers: perform the transformation of the received voltage to lower levels, suitable for internal consumption;

Bolts and busbars: ensure safe connections between components;

Protections and relays: monitor the system, identifying faults and ensuring quick action to prevent major damage;

Panels and metal-clad switchgear: house and organize the switching and protection devices, offering insulation and operational safety.

All these elements must be chosen and installed according to technical specifications, aiming for optimal performance and compliance with legal requirements.

See what the main standards and regulations are

The medium voltage electrical installation in Brazil is regulated by standards and legislation that establish minimum safety and performance requirements. Compliance with these rules is mandatory and prevents operational risks, accidents, and penalties.

ABNT NBR 14039: deals with medium voltage electrical installations from 1.0 kV to 36.2 kV, covering everything from design to maintenance;

NR 10: Regulatory Standard that defines safety guidelines in electrical installations and services with electricity, including the mandatory use of PPE;

Aneel Resolutions: regulate the connection of consumer units to the distribution network, determining technical and contractual criteria.

Following these standards ensures the correct operation of the system, the preservation of lives, and the continuity of the energy supply.

The future of your installation starts here

The medium voltage electrical installation is a robust and indispensable system for high energy consumption operations. Composed of cables, circuit breakers, transformers, and other specialized components, it ensures a stable, safe, and efficient supply, provided it is executed according to specific standards and regulations.

Companies, supermarkets, malls, hospitals, and other enterprises operating at this voltage level must rely on qualified suppliers and professionals to ensure not only performance but also safety and legal compliance.

Trifásica Elétrica is a national reference in this segment, offering complete solutions in medium voltage and being the largest electrical distribution center from 15 to 36 kV in Brazil. Visit our website and see how we can help your business operate with energy efficiently and safely.