IEC 60255-27:2013

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General safety requirements
5 Protection against electric shock
6 Mechanical aspects
7 Flammability and resistance to fire
8 General and fundamental design
   requirements for safety
9 Marking, documentation and packaging
10 Type tests and routine tests
Annex A (normative) - Isolation class requirements
        and example diagrams
Annex B (normative) - Rated impulse voltages
Annex C (normative) - Guidance for the determination
        of clearance, creepage distance and
        withstand voltages
Annex D (informative) - Components
Annex E (normative) - External wiring terminations
Annex F (informative) - Examples of battery protection
Bibliography

IEC 60255-27:2013 describes the product safety requirements for measuring relays and protection equipment having a rated a.c. voltage up to 1 000 V with a rated frequency up to 65 Hz, or a rated d.c. voltage up to 1 500 V. Above these limits, IEC 60664-1 is applicable for the determination of clearance, creepage distance and withstand test voltage. This standard details essential safety requirements to minimize the risk of fire and hazards caused by electric shock or injury to the user. This new edition includes the following significant technical changes with respect to the previous edition:
- the removal of tables and diagrams which are from other standards and referring instead directly to the source standard;
- all aspects of IEC 60255-5 have been covered and this standard will be withdrawn.