IEC 61558-2-14:2012 deals with safety of variable transformers for general applications and power supply units incorporating variable transformers for general applications. Transformers incorporating electronic circuits are also covered by this standard. This first edition cancels and replaces the chapter IV of the IEC 60989 published in 1991. It is a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) update of the existing text; b) complete editorial review. This part has the status of a group safety publication in accordance with IEC Guide 104:2010. The preparation of safety publications and the use of basic safety publications and group safety publications. The attention of National Committees is drawn to the fact that equipment manufacturers and testing organizations may need a transitional period following publication of a new, amended or revised IEC publication in which to make products in accordance with the new requirements and to equip themselves for conducting new or revised tests. It is the recommendation of the committee that the content of this publication be adopted for implementation nationally not earlier than 12 months from the date of publication. This publication is to be read in conjunction with \/2.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 6<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 4 General requirements 5 General notes on tests <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 6 Ratings 7 Classification 8 Marking and other information <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 9 Protection against electric shock 10 Change of input voltage setting 11 Output voltage and output current under load 12 No-load output voltage <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 13 Short-circuit voltage Table 101 \u2013 Output voltages difference for auto transformers, separating and safety isolating transformers Table 102 \u2013 Output voltages difference for isolating transformers <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 14 Heating 15 Short circuit and overload protection 16 Mechanical strength Table 103 \u2013 Maximum permitted temperatures of the winding <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 17 Protection against harmful ingress of dust, solid objects and moisture 18 Insulation resistance, dielectric strength and leakage current 19 Construction <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 20 Components 21 Internal wirings 22 Supply connection and other external flexible cables or cords 23 Terminals for external conductors 24 Provision for protective earthing <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 25 Screws and connections 26 Creepage distances, clearances and distances through insulation 27 Resistance to heat, fire and tracking 28 Resistance to rusting <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Annexes <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Safety of transformers, reactors, power supply units and combination thereof – Particular requirements and tests for variable transformers and power supply units incorporating variable transformers<\/b><\/p>\n |