BSI 17/30352666 DC:2017 Edition
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BS EN 61869-220. Instrument transformers. Part 220. Safety requirements for Instrument Transformers for low voltage applications
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 53 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 10 | INTRODUCTION |
| 11 | 1 Scope and object 2 Normative references 3 Terms and definitions 3.1 Equipment and states of equipment |
| 12 | 3.4 Parts and accessories 3.5 Quantities |
| 13 | 3.6 Tests 3.7 Safety terms |
| 15 | 3.9 Insulation |
| 16 | 4 Tests 5 Marking and documentation 5.1 Marking 5.1.1 General 5.1.2 Identification |
| 17 | 5.1.3 Mains supply |
| 19 | 5.1.4 Fuses 5.1.5 Terminals, connections and operating devices other than measuring circuit terminals 5.1.6 Switches and circuit-breakers 5.1.7 Equipment protected by double insulation or reinforced insulation 5.1.8 Field-wiring terminal boxes 5.1.9 Measuring circuit terminals 5.1.9.1 General 5.1.9.2 Measuring circuit terminals rated for measurement categories II,III or IV |
| 20 | 5.1.9.3 Measuring circuit terminals rated for connection to voltages above the levels of clause 6.3.1 5.1.9.4 Permanently connected, dedicated, or low voltage measuring circuit terminals 5.2 Warning markings 5.3 Durability of markings 5.4 Documentation 5.4.1 General |
| 21 | 5.4.2 Equipment ratings 5.4.3 Equipment installation |
| 22 | 5.4.4 Equipment operation 5.4.5 Equipment maintenance and service 5.4.6 Integration into systems or effects resulting from special conditions 6 Protection against electric shock 6.1 General 6.1.1 Requirements 6.1.2 Exceptions 6.2 Determination of accessible parts 6.3 Limit values for accessible parts 6.4 Primary means of protection 6.5 Additional means of protection in case of single fault conditions 6.5.1 General |
| 23 | 6.5.2 Protective bonding 6.5.2.1 General 6.5.2.2 Integrity of protective bonding |
| 24 | 6.5.2.3 Protective conductor terminal 6.5.2.4 Impedance of protective bonding of plug-connected equipment 6.5.2.5 Impedance of protective bonding of permanently connected equipment 6.5.2.6 Transformer protective bonding screen 6.5.3 Supplementary insulation and reinforced insulation 6.5.4 Protective impedance 6.5.5 Automatic disconnection of the supply |
| 25 | 6.5.6 Current- or voltage-limiting device 6.6 Connections to external circuits 6.6.1 General 6.6.2 Terminals for external circuits 6.6.3 Circuits with terminals which are hazardous live 6.6.4 terminals for stranded conductors 6.7 Insulation requirements 6.7.1 The nature of insulation 6.7.1.1 General 6.7.1.2 Clearances |
| 26 | 6.7.1.3 Creepage distances 6.7.1.4 Solid insulation 6.7.1.5 Requirements for insulation according to type of circuit 6.7.2 Insulation for mains circuits of overvoltage category II with a nominal supply voltage up to 300 V 6.7.3 Insulation for secondary circuits derived from mains circuits of overvoltage category II up to 300 V 6.8 Procedure for voltage tests 6.9 Constructional requirements for protection against electric shock 6.10 Connection to the mains supply source and connections between parts of equipment |
| 27 | 6.11 Disconnection from supply source 7 Protection against mechanical hazards 8 Resistance to mechanical stresses 9 Protection against the spread of fire 10 Equipment temperature limits and resistance to heat 10.1 Surface temperature limits for protection against burns 10.2 Temperatures of windings 10.3 Other temperature measurements 10.4 Conduct of temperature tests 10.4.1 General 10.4.2 Temperature measurement of heating equipment 10.4.3 Equipment intended for installation in a cabinet or a wall 10.5 Resistance to heat 11 Protection against hazards from fluids 11.1 General |
| 28 | 11.2 Cleaning 11.3 Spillage 11.4 Overflow 11.5 Battery electrolyte 11.6 Equipment rated with a degree of ingress protection (IP) 11.6.1 General 11.6.2 Conditions for testing 11.6.2.1 Protection against solid foreign objects (including dust) |
| 29 | 11.6.2.2 Protection against water 11.7 Fluid pressure and leakage 11.8 Corrosion 12 Protection against radiation, including laser sources, and against sonic and ultrasonic pressure 13 Protection against liberated gases and substances, explosion and implosion 14 Components and subassemblies 14.1 General |
| 30 | 14.2 Motors 14.3 Overtemperature protection devices 14.4 Fuse holders 14.5 Mains voltage selection devices 14.6 Mains transformers tested outside equipment 14.7 Printed wiring boards 14.8 Circuits or components used as transient overvoltage limiting devices |
| 31 | 15 Protection by interlocks 16 Hazards resulting from application 17 Risk assessment 18 Secondary circuits |
| 32 | Annex A (normative) Measuring circuits for touch current (see 6.3) |
| 33 | Annex B (normative) Standard test fingers (see 6.2) |
| 34 | Annex C (normative) Measurement of clearances and creepage distances |
| 35 | Annex D (normative) Parts between which insulation requirements are specified (see 6.4 and 6.5.3) |
| 37 | Annex E (informative) Guideline for reduction of pollution degrees |
| 38 | Annex F (normative) Routine tests |
| 39 | Annex G (informative) Leakage and rupture from fluids under pressure |
| 40 | Annex H (normative) Qualification of conformal coatings for protection against pollution |
| 41 | Annex I (informative) Line-to-neutral voltages for common mains supply systems |
| 42 | Annex J (informative) Risk assessment |
| 43 | Annex K (normative) Insulation requirements not covered by 6.7 K.1 Requirements for mains circuits K.2 Insulation in secondary circuits K.3 Insulation in circuits not addressed in 6.7, Clause K.1, Clause K.2, clause K.5, and for measuring circuits where measurement categories do not apply K.4 Reduction of transient overvoltages by the use of overvoltage limiting devices K.5 Insulation requirements for measuring circuits of measurement categories II, III and IV K.5.1 General K.5.2 Clearances |
| 44 | K.5.3 Clearances K.5.4 Solid insulation K.5.4.1 General |
| 47 | K.5.4.2 Moulded and potted parts K.5.4.3 Insulating layers of printed wiring boards K.5.4.4 Thin-film insulation |
| 49 | Annex L (informative) Index of defined terms |
| 50 | Annex M (normative) Measurement categories M.1 General M.2 Measurement categories M.2.1 Measurement category II M.2.2 Measurement category III B.2.3 Measurement category IV B.2.4 Measuring circuits without a measurement category rating |
| 52 | Bibliography |
