INTRODUCTION
1 Scope and object
2 Normative references
3 Terms and definitions
4 General safety requirements
4.1 Earthing requirements (grounding, earthing
and screening)
5 Protection against electric shock
5.1 Requirements for protection against electric
shock
5.2 Single-fault conditions
6 Mechanical aspects
6.1 Protection against mechanical hazards
6.2 Mechanical requirements
6.3 Mechanical security of terminations
7 Flammability and resistance to fire
7.1 General
7.2 General hazards from overheating and fire
7.3 Minimization of fire risk
7.4 Cabling and fusing
7.5 Flammability of materials and components
7.6 Fire ignition sources
7.7 Conditions for a fire enclosure
7.8 Requirements for primary circuits and circuits
exceeding ELV limits
7.9 Fire enclosures and flame barriers
7.10 Assessment of the fire risk due to a
single-fault condition
7.11 Limited-energy circuit
8 General and fundamental design requirements for
safety
8.1 Climatic conditions for safety
8.2 Electrical connections
8.3 Components
8.4 Connection to communication networks
8.5 Connection to other equipment
8.6 Laser sources
8.7 Explosion
9 Marking, documentation and packaging
9.1 Marking
9.2 Documentation
9.3 Packaging
10 Type tests and routine tests
10.1 Safety type tests
10.2 Routine testing or sample testing
10.3 Conditions for testing
10.4 Verification procedure
10.5 Tests
Annex A (normative) Isolation class requirements
and example diagrams
Annex B (informative) Nominal voltages of supply systems
Annex C (normative) Rated impulse voltages
Annex D (normative) Guidance for the determination of
clearance, creepage distance and
withstand voltages
Annex E (informative) Measurement of creepage distances
and clearances
Annex F (normative) Standard test fingers
Annex G (informative) Guidance for impulse voltage test
Annex H (informative) Components
Annex I (informative) Safe maximum short-term voltage
duration and capacitor size
under a single-fault condition
Annex J (informative) External wiring terminations
Annex K (informative) Examples of battery protection
Annex L (informative) Reasons why functional safety is
excluded from the scope of
IEC 60255-27
Bibliography
Annex ZA (normative) Normative references to international
publications with their corresponding
European publications