IEC 61991 pdf download

IEC 61991 pdf download.Railway applications – Rolling stock – Protective provisions against electrical hazards
1 Scope
IEC 61 991 offers a set of rules that are applied in the design and manufacture of electrical installations and equipment to be used on rolling stock so as to protect the persons from electric shocks. The methods used to satisfy the rules may differ, in accordance with the procedures and practices of the operating organization. IEC 61 991 is applicable to vehicles of rail transport systems, road vehicles powered by an external supply (trolley buses), magnetic levitated vehicles and to the electrical equipment installed in these vehicles. This standard does not apply to – mine railways in underground mines; – crane installations, moving platforms and similar transport systems on rails; – funicular railways; – temporary constructions. Testing of vehicles against the requirements of IEC 61 991 is not included. For this, refer to IEC 61 1 33.
3 Definitions
For the purposes of IEC 61 991 , the following definitions apply. For more information relating to definitions of parts of the fixed installations, refer to IEC 621 28 from which these definitions are derived. NOTE In order to avoid risks of misunderstanding, definitions used in the text are written in italics. 3.1 Definitions concerning persons involved 3.1 .1 skilled person person who can judge the work assigned to him and recognize possible dangers on the basis of his professional training, knowledge and experience and of his knowledge of the relevant requirements 3.1 .2 instructed person person informed about the tasks assigned to him and about possible dangers involved in neglectful behaviour and who, if necessary, has been given a degree of training 3.1 .3 ordinary person any person who cannot be defined either as a skilled person or as an instructed person 3.2 Other definitions 3.2.1 closed electrical operating area any room or location which serves exclusively for the operation of electrical equipment and is kept secure by a means appropriate to the voltage and location NOTE 1 Access to such areas is permitted only to skilled persons and instructed persons . NOTE 2 The definition of closed electrical operating area can be suitable for underfloor or upper roof cabinets. Generally speaking it is any location (inside or outside the car body) which is kept secure because of the voltage that can assume the equipment inside it. Access to such areas is not allowed to ordinary persons . 3.2.2 contact line conductor system for supplying electrical energy to vehicles through current-collecting equipment 3.2.3 contact wire electric conductor of an overhead contact line with which the current collectors make contact 3.2.4 direct contact contact of persons or livestock with live parts 3.2.5 earth conductive mass of the earth, whose electrical potential at any point is conventionally taken as equal to zero 3.2.6 electrical operating area any room or location which serves primarily for the operation of electrical equipment and is normally entered only by skilled persons or instructed persons NOTE The definition of closed electrical operating area can be suitable for underfloor or upper roof cabinets. Generally speaking it is any location (inside or outside the car body) which is kept secure because of the voltage that can assume the equipment inside it. Access to such areas is not allowed to ordinary persons . 3.2.7 electric shock dangerous physiological effect resulting from the passing of an electric current through a human or animal body 3.2.8 exposed conductive part any metallic or other form of conductive material which is not energized except in case of failure , and which may be accessible to touch 3.2.9 failure termination of the ability of an item to perform a required function 3.2.1 0 hazard condition that can lead to a potential accident or an actual accident 3.2.1 1 indirect contact contact of persons or livestock with exposed conductive parts which have become live under fault conditions