IEC 60364-5-51:2001

Sets out rules which govern selection and erection of equipment in general and stipulates compliance with measures of protection of safety, requirements for proper functioning for intended use and those appropriate to external influences. Gives in tabular form characteristics required for selection and erection of equipment with respect to external influences.

Includes the following: purposes, supplies and structures (gives descriptions of TN, TT and IT distribution systems and system earthing); classification of external influences; compatibility; maintainablility; safety services.

Deals with the selection of equipment and its erection. It provides common rules for compliance with measures of protection for safety, requirements for proper functioning for intended use of the installation, and requirements appropriate to the external influences foreseen. The main changes with respect to the previous edition are listed below: - corrections of misprints in Table 51 based on Table 321 derived from the old Part 3; - introduction of a new Clause 516 dealing with measures for mitigation of protective conductor currents; - introduction of an informative Annex B extracted from IEC 61140 in Annex E of this standard. Annex B of IEC 61140 deals with protective conductor currents.