SIST EN 50110-1:1999

Operation of electrical installations

This standard is applicable to all operation of and work activity on, with, or near electrical installations. These installations operate at voltage levels from and including extra-low voltage up to and including high voltage. This latter term includes those levels referred to as medium and extra-high voltage. These electrical installations are designed for the generation, transmission, conversion, distribution and use of electrical power. Some of these electrical installations are permanent and fixed, such as a distribution installation in a factory or office complex, others are temporary, such as on construction sites and others are mobile or capable of being moved either whilst energized or whilst not energized nor charged. Examples are electrically driven excavating machines in quarries or open-cast coal sites. This standard sets out the requirements for the safe operation of and work activity on, with, or near electrical installations. These requirements apply to operational, working and maintenance procedures. It applies to all electrical work activities as well as non-electrical work activities such as building work near to overhead lines or underground cables. This standard does not apply to ordinary persons when using installations and equipment, provided that the installations and equipment are designed and installed for use by ordinary persons and they comply with relevant standards. This standard has not been developed specifically to apply to the electrical installations listed below. However, it is recommended that persons responsible for such installations should use this standard as a guide to the aims to be achieved in setting out their rules and procedures: on any aircraft and hovercraft moving under its own power, (these are subject to International Aviation laws which take precedence over National laws in these situations); on any sea going ship moving under its own power, or under the direction of the master, (these are subject to International Marine laws which take precedence over National laws in these situations); electronic telecommunications and information systems; electronic instrumentation, control and automation systems; at coal or other mines; on off-shore installations subject to International Marine laws; on vehicles; on electric traction systems; on experimental electrical research work