High Voltage (AT): voltage greater than 1000 volts for alternating current and 1500 volts for direct current between phases or between phase and earth.
Hazardous Area: an area with potential of occurrence of explosive atmosphere.
Temporary Grounding: an adequate, effective and reliable electrical connection to the earth, intended to ensure equipotentiality and maintained continuously during the intervention in the electrical installation.
Explosive Atmosphere: mixture with air, under atmospheric conditions, and flammable substances in the form of gas, vapor, dust, fibers or flyings which, after ignition, permits self-sustaining propagation.
Low Voltage (BT): voltage greater than 50 volts for alternating current or 120 volts for direct current and equal to or less than 1000 volts for alternating current or 1500 volts for direct current between phases or between phase and earth.
Barrier: device which prevents any contact with live parts of electrical installations.
Right to Refuse: instrument that assures the employees of the termination of a work activity as it considers that it involves serious and imminent risk to their health and safety or that of others.
Collective Protective Equipment (EPC): fixed or mobile device, system, or mean designed to preserve the physical integrity and health of the workers, users and third parties.
Segregated Equipment: equipment rendered inaccessible by means of closures or barriers.
Extra-Low Voltage (EBT): voltage not greater than 50 volts for alternating current or 120 volts for direct current between phases or between phase and earth.
External Influences: variables that shall be considered in the definition and selection of protective measures for safety of people and the performance of the components of installations.
Electrical Installation: set of electrical and nonelectrical parts associated and with characteristics coordinated with each others, which are necessary in a particular part of an electrical system.
Installation Released for Services (BT/AT): that which ensures the safety conditions for workers through appropriate procedures and equipments from the beginning to the end of the work and release for use.
Prevention of Re-energization: condition that guarantees no energization on the circuit through appropriate resources and procedures, under the control of the workers involved in the services.
Enclosure: envelope of energized parts in order to prevent any contact with internal parts.
Electrical Insulation: process designed to prevent the passage of electrical current through the interposition of insulating materials.
Obstacle: element that prevents accidental contact, but does not prevent direct contact by deliberate action.
Hazard: risk situation or condition likely to cause injury or damage to people’s health in the absence of control measures.
Warned Person: a person informed or have sufficient knowledge to avoid the electrical hazards.
Procedure: sequence of operations to be developed to perform a particular job with the inclusion of material and human resources, safety measures and circumstances that preclude its realization.
Log Book: system organized so as to contain a dynamic memory of information pertaining to the installations and to the workers.
Risk: capacity of a magnitude likely to cause injury or damage to people’s health.
Additional Risk: all other risk factors or groups, besides the electrical, specific to each environment or work processes which directly or indirectly may affect the safety and health at work.
Tag out: standardized procedure to guide, alert, notify and warn.
Electrical System: circuit or interrelated electrical circuits designed to achieve a certain goal.
Electric Power System (SEP): set of electrical installations and equipments intended for generation, transmission and distribution of electrical energy until the measuring instrument, inclusive.
Safety Voltage: extra-low voltage originated in a safety source.
Working in Proximity: work during which a worker can enter in a controlled area either with a part of his body or through conducting extensions, such as materials, tools or equipments.
Lock out: action designed to keep a maneuvering device fixed in a particular position by mechanical means so as to prevent unauthorized operation.
Risk Area: vicinity of the non-segregated, accidentally accessible, energized conductive parts, to the distance established in accordance with the voltage level, in where only authorized professionals with the techniques and tools appropriate to the task are allowed.
Controlled Area: vicinity of the non-segregated, accessible, energized conductive parts, to the distance established in accordance with the voltage level, in where only authorized professionals are allowed.