ДСТУ EN IEC 60255-27:2026 Вимірювальні реле та обладнання захисту. Частина 27. Вимоги щодо безпеки виробів (EN IEC 60255-27:2025, IDT; IEC 60255-27:2023, IDT)



ДСТУ EN IEC 60255-27:2026
(EN IEC 60255-27:2025, IDT; IEC 60255-27:2023, IDT)

Вимірювальні реле та обладнання захисту. Частина 27. Вимоги щодо безпеки виробів

 
   
 
 
     
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

Contents

Foreword

Introduction

1 Scope

2 Normative references

3 Terms and definitions

4 Protection against electric shock

4.1 Protection from contact with hazardous-live-parts

4.1.1 General

4.1.2 Insulation

4.1.3 Equipment enclosure and barriers

4.1.4 Hazardous live terminations using stranded wire

4.2 Protective impedance

4.3 Accessible parts

4.3.1 General

4.3.2 Determination of accessible parts

4.3.3 Permissible limits for accessible parts

4.4 Earthing and protective bonding requirements

4.4.1 General

4.4.2 Insulation between live parts and accessible conductive parts

4.4.3 Protective bonding

4.5 Functional earthed circuits

4.6 Protective conductor connection

4.7 High leakage current

4.8 Solid insulation

4.8.1 General

4.8.2 Requirements

4.9 Clearances and creepage distances

4.9.1 General

4.9.2 Clearances

4.9.3 Creepage distances

4.10 Single fault conditions

4.10.1 Testing in single fault condition

4.10.2 Application of single fault condition

4.10.3 Duration of tests

4.10.4 Compliance

5 Mechanical aspects

5.1 Protection against mechanical hazards

5.1.1 Stability

5.1.2 Moving parts

5.1.3 Edges and corners

5.2 Mechanical requirements

5.3 Mechanical security of terminations

6 Flammability and resistance to fire

6.1 General

6.2 Requirements for protection against the spread of fire

6.3 General hazards from overheating and fire

6.3.1 Surface temperature limits for protection against burns

6.3.2 Hazardous gases and chemicals

6.4 Minimization of fire risk

6.4.1 General

6.4.2 Eliminating or reducing the sources of ignition within the equipment

6.5 Cabling and fusing

6.6 Flammability of materials and components

6.6.1 General

6.6.2 Materials for components and other parts inside fire enclosures

6.6.3 Materials for fire enclosures

6.6.4 Materials for components and other parts outside fire enclosures

6.7 Fire ignition sources

6.8 Conditions for a fire enclosure

6.8.1 Parts requiring a fire enclosure

6.8.2 Parts not requiring a fire enclosure

6.9 Fire enclosures and flame barriers

6.9.1 General

6.9.2 Fire enclosures and flame barrier requirements

6.10 Assessment of the fire risk due to a single fault condition

6.10.1 Guidelines for maximum acceptable temperatures when subjecting a circuit or component to a single fault condition

6.10.2 Temperature of windings under normal use or a single fault condition

6.10.3 Conformity of equipment with requirements for protection against the spread of fire

6.11 Limited-energy circuit

7 General and fundamental design requirements for safety

7.1 Climatic conditions for safety

7.2 Electrical connections

7.3 Components

7.3.1 General

7.3.2 High-integrity part or component

7.4 Connection to other equipment

7.5 High-intensity light sources

7.6 Explosion

7.6.1 General

7.6.2 Components at risk of explosion

8 Marking, documentation and packaging

8.1 Marking

8.1.1 General

8.1.2 Identification

8.1.3 Auxiliary supplies, measurands, inputs and outputs

8.1.4 Fuses

8.1.5 Measuring circuit terminals

8.1.6 Terminals and operating devices

8.1.7 Equipment protected by double or reinforced insulation

8.1.8 Batteries

8.1.9 Test voltage marking

8.1.10 Warning markings

8.1.11 Marking durability

8.2 Documentation

8.2.1 General

8.2.2 Equipment ratings

8.2.3 Equipment installation

8.2.4 Equipment commissioning and maintenance

8.2.5 Equipment operation

8.3 Packaging

9 Type tests and routine tests

9.1 General

9.2 Safety type tests

9.3 Routine testing

9.4 Conditions for testing

9.5 Verification procedure

9.6 Tests

9.6.1 Climatic environmental tests

9.6.2 Mechanical tests

9.6.3 Clearances and creepage distances

9.6.4 Safety-related electrical tests

9.6.5 Electrical environment and flammability

9.6.6 Reverse polarity and slow ramp test

9.6.7 Resistance to mechanical stress

Annex A (normative) Isolation class requirements and example diagrams

A.1 General

A.2 Hazardous live voltage (HLV)

A.3 Symbols

A.4 Typical insulation examples complying with the requirements of Table A.2

Annex B (normative) Rated impulse voltages

Annex C (normative) Guidance for the determination of clearance, creepage distance and withstand voltages

C.1 General

C.1.1 Introductory remark

C.1.2 Rated insulation voltages

C.1.3 Determination of rated insulation voltage

C.1.4 Determination of rated impulse voltage

C.1.5 Switching overvoltages generated by equipment

C.1.6 Insulation material

C.1.7 Overvoltage categories

C.2 Determination of clearances, creepage distances and withstand voltages

C.2.1 Guidance for determination of clearances, creepage distances and withstand voltages

C.2.2 Determination of clearances, creepage distances and withstand voltages

Annex D (informative) Components

D.1 General

D.2 Introductory remark

D.3 Transformers

D.4 Equipment primary circuit capacitors

D.5 Coil devices - transformers, instrument transformers and transducers, reactors, and operating coils of relays and contactors with multiple windings and/or screen

D.5.1 Coil windings

D.5.2 Insulating foil

D.5.3 Interposing protective screen

D.5.4 Safety isolation transformers

D.6 Electromechanical components

D.7 Semiconductor components and semiconductor configurations

D.8 Connectors and terminal blocks

D.9 Voltage dependent resistors (VDRs)

D.10 Intentional radio transmitters

Annex E (normative) External wiring terminations

E.1 General

E.2 Permanently connected equipment

E.3 Conductors

E.4 Terminals

Annex F (informative) Examples of battery protection

Annex G (informative) Risk assessment

G.1 General

G.2 Risk assessment procedure

G.3 Achieving tolerable risk

G.4 An application of risk assessment procedures

Bibliography