Safety of transformers, reactors, power supply units and combinations thereof - Part 2-12: Particular requirements and tests for constant voltage transformers and power supply units for constant voltage

Published date

11-03-2011

Publisher

European Committee for Standards - Electrical

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 General notes on tests
6 Ratings
7 Classification
8 Marking and other information
9 Protection against electric shock
10 Change of input voltage setting
11 Output voltage and output current under load
12 No-load output voltage
13 Short-circuit voltage
14 Heating
15 Short-circuit and overload protection
16 Mechanical strength
17 Protection against harmful ingress of dust,
   solid objects and moisture
18 Insulation resistance, dielectric strength and
   leakage current
19 Construction
20 Components
21 Internal wiring
22 Supply connection and other external flexible
   cables or cords
23 Terminals for external conductors
24 Provision for protective earthing
25 Screws and connections
26 Creepage distances, clearances and distances
   through insulation
27 Resistance to heat, fire and tracking
28 Resistance to rusting
Annexes
Annex C (normative) - Creepage distances (cr),
        clearances (cl) and distances through insulation
        (dti) - Material group II (400 <= CTI < 600)
Annex D (normative) - Creepage distances (cr), clearances
        (cl) and distances through insulation (dti) - Material
        group I (CTI >= 600)
Annex L (normative) - Routine tests (production tests)
Annex R (normative) - Explanations of the application of
        4.1.1.2.1 of IEC 60664-1
Bibliography

IEC 61558-2-12:2011 deals with the safety of constant voltage transformers for general applications and power supply units for constant voltage for general applications. Constant voltage transformers incorporating electronic circuits are also covered by this standard. This second edition cancels and replaces the first edition published in 2001. It constitutes a technical revision. The main changes consist of updating this part in accordance with IEC 61558-1:2009. This part has the status of a group safety publication in accordance with IEC Guide 104: 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. In the meantime, the previous edition can still be ordered by contacting your local IEC member National Committee or the IEC Central Office.

DevelopmentNote	To be read in conjunction with EN 61558-1. (03/2011)
DocumentType	Standard
PublisherName	European Committee for Standards - Electrical
Status	Current

Standards	Relationship
BS EN 61558-2-12:2011	Identical
DIN EN 61558-2-12 : 2011	Identical
NEN EN IEC 61558-2-12 : 2011	Identical
VDE 0570-2-12 : 2011	Identical
PN EN 61558-2-12 : 2011	Identical
CEI EN 61558-2-12 : 2012	Identical
NBN EN 61558 2-12 : 2011	Identical
UNE-EN 61558-2-12:2011	Identical
I.S. EN 61558-2-12:2011	Identical
NF EN 61558-2-12 : 2011	Identical
SN EN 61558-2-12 : 2001	Identical
IEC 61558-2-12:2011	Identical
BS EN 61158-3-4:2014	Identical

EN 61558-2-16:2009/A1:2013	SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS AND SIMILAR PRODUCTS FOR SUPPLY VOLTAGES UP TO 1 100 V - PART 2-16: PARTICULAR REQUIREMENTS AND TESTS FOR SWITCH MODE POWER SUPPLY UNITS AND TRANSFORMERS FOR SWITCH MODE POWER SUPPLY UNITS (IEC 61558-2-16:2009/A1:2013)
EN 61558-1:2005/A1:2009	SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES, REACTORS AND SIMILAR PRODUCTS - PART 1: GENERAL REQUIREMENTS AND TESTS
IEC 61558-2-16:2009+AMD1:2013 CSV	Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 V - Part 2-16: Particularrequirements and tests for switch mode power supply units andtransformers for switch mode power supply units