A NR-10 This is one of the most important standards when it comes to safety in electrical activities in industry. Failures in this area can lead not only to operational losses, but also to serious risks to the physical integrity of workers, such as electric shocks.

Therefore, following the guidelines of NR-10 is fundamental for preventing accidents and ensuring standardization of safe practices within companies. In this article, you will find all the information about the regulatory standard: its purpose, voltage classifications, validity, and much more.

What is NR-10 and what is its impact on industry?

Considered one of the most important guidelines of Ministry of Labor and Employment, NR-10 andestablishes the minimum conditions, control measures and preventive systems to guarantee safety. in electrical installations and services.

Your application is mandatory for all companies and professionals who interact directly or indirectly with electrical systems., encompassing everything from the generation, transmission, distribution and consumption of energy, to the stages of design, construction, assembly, operation, maintenance and work carried out in the vicinity of electrical installations.

What is the purpose of NR-10 for workplace safety?

The main objective of NR-10 is to ensure that all activities involving electricity are carried out with maximum safety., minimizing the risks inherent in this area. To achieve this, it focuses on establishing:

• Effective control measures: from safe de-energization to the use of collective (CPE) and individual (IPE) protective equipment;

• Safe work procedures: outlining the necessary steps for each type of electrical service;

• Training and professional development: ensuring that only properly trained, qualified or authorized workers perform tasks on electrical systems;

• Electrical installation records: A mandatory document that compiles crucial information about the company's electrical system.

By fulfilling these objectives, NR-10 seeks to create a work environment where the physical integrity of professionals is preserved, preventing accidents that can have serious, even fatal, consequences.

Understanding voltage classification

A voltage rating Voltage is a fundamental concept in electricity and in NR-10 (Brazilian Regulatory Standard 10), as it specifies the types of voltage based on the potential of an electric current. This categorization is crucial for determining the... associated risk levels and the appropriate safety measures for each type of work and environment.

NR-10 defines concepts and classifies electrical voltage levels, ensuring that the highest-risk activities are performed only by properly trained and authorized professionals. This specification guides the adoption of... specific security measures as neededand from planning to executing tasks.

Although other standards exist, such as those from ABNT, that also address voltage classification, it is imperative that electrical professionals understand and apply the classification according to NR-10 to ensure legal compliance and protection in the field.

Learn about the voltage classification according to NR-10.

NR-10 classifies voltages into four distinct groups, which are of great relevance to... definition of appropriate security measures and for understanding the risks. Below, we detail the characteristics of each level:

Extra-low voltage — ELV

A extra-low voltage (ELV), According to NR-10, it is a voltage not exceeding 50 volts in alternating current (AC) or 120 volts in direct current (DC), between phases or between phase and ground. This level is considered to be low risk, However, it still requires attention and safety procedures, especially when the source is not inherently safe.

Safety voltage

This level is established for to guarantee collective security. This refers to extra-low voltage originating from a safe source, designed to present no risk of electric shock. Safety voltage takes into account various factors, such as... nature of the current and environmental influences, to ensure safe operation.

Low voltage — LV

A low voltage (LV), according to NR-10, covers values higher than 50 volts and equal to or less than 1,000 volts in alternating current (AC), or higher than 120 volts and equal to or less than 1,500 volts in direct current (DC), between phases or between phase and ground. Low voltage (LV) activities require rigorous attention to safety procedures, including de-energization, lockout and the use of specific PPE.

High voltage — HV

A high voltage (HV) includes values greater than 1,000 volts in alternating current (AC) or 1.500 Volts for direct current (DC), between phases or between phase and ground. High-voltage work is extremely risky, and NR-10 establishes that under these conditions, a worker cannot perform the activities alone or without the necessary training and authorization.

Detailed planning and execution by multidisciplinary teams, using rigorous equipment and procedures, are crucial.

It is important to emphasize that NR-10 does not explicitly mention medium voltage classification.. However, the term is widely used in other standards and in the Electrical Power System, such as in NBR 14039. For safety purposes and the application of NR-10, the distinction between LV and HV is the most relevant.

Key points of the updated NR-10

A NR-10 updated It reinforces the importance of risk prevention and control. Key points include:

• Electrical installation records (PIE): Maintaining and updating the PIE (Protective Inspection Plan) is crucial, detailing single-line diagrams, inspection reports, specifications of protective equipment, and the results of insulation tests;

• Control measures: Emphasis on prioritizing collective protection measures (CPE) over individual protection measures (IPE);

• Work procedures: The need to develop and comply with specific procedures for each type of electrical intervention;

• Risk analysis: A preliminary risk analysis must be carried out before any electrical work, identifying hazards and defining preventive and corrective measures;

• Legal responsibility: The standard clearly establishes the employer's responsibilities in ensuring a safe work environment and the qualification of its employees. Failure to comply with the requirements of NR-10 may result in significant fines and civil and criminal liabilities.

NR-10 Training: Requirements for Professionals and Companies

The need for NR-10 training It is explicitly stated for all professionals who work with electricity. The training is divided into:

• Basic: with a 40-hour work week, mandatory for workers authorized to work on electrical installations and services involving electricity;

• Complementary (SEP): For those working in and around the Electrical Power System (SEP), with an additional 40 hours of training, totaling 80 hours.

Companies have a responsibility to ensure that their employees receive adequate training, delivered by qualified instructors. Furthermore, they must provide the necessary resources to ensure effective learning and that safety practices are incorporated into daily operations.

NR-10 Validity and the Need for Updating

The certificate of validity of NR-10 has a two-year period. After this period, it is mandatory that the professional carry out the NR-10 recycling to renew your authorization to work with electricity.

The need for continuous updating ensures that knowledge about electrical safety is always aligned with the latest practices and any changes in the standard.

When to carry out NR-10 retraining

In addition to the two-year deadline, NR-10 retraining is required in other specific situations:

• Job change or company transfer: when a professional changes jobs or employers, even if the functions are similar;

• Return from leave or inactivity: if the worker is absent from work for more than three months;

• Significant modification to facilities or work methods: to adapt knowledge to new conditions;

• Accidents or incidents that highlight the need for an update: In the event of incidents that demonstrate deficiencies in safety knowledge.

NR-10 and safety in electrical installations and services: best practices

To ensure NR-10 safety in electrical installations and services, some best practices are essential:

• Rigorous planning: All electrical work must be planned, with risk analysis and a clear definition of procedures;

• De-energization: Whenever possible, circuits should be de-energized before any intervention, with lockout and grounding applied;

• Proper use of PPE and EPC: Use appropriate personal and collective protective equipment for the task, in perfect condition;

• Signaling: Keep the work area properly marked and isolated;

• Communication: to ensure clear and efficient communication within the team;

• Preventive maintenance: To carry out periodic inspections and maintenance on electrical installations and equipment to identify and correct faults before they become problems.