IEC 61820-3-4:2023 specifies protective provisions for the operation of lamp systems powered by series circuits in aeronautical ground lighting. The protective provisions described here refer only to secondary supply systems for loads that are electrically separated from the series circuit. This document specifies the level of SELV, and alternatively PELV, under consideration of additional personnel protection during work on live secondary circuits by electrically skilled persons. This document also covers the special operational features of aeronautical ground lighting and addresses the level of training and the requirements for maintenance procedures detailed in IEC 61821 and other national or regional regulation. The requirements and tests are intended to set a specification framework for system designers, system installers, users, and maintenance personnel to ensure a safe and economic use of electrical systems in installations for the beaconing of aerodromes. This document complements existing IEC aeronautical ground lighting (AGL) standards and can be used as a design specification.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3 Terms, definitions, and abbreviated terms 3.1 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 3.2 Abbreviated terms 4 Requirements for the SELV\/PELV supply 4.1 General 4.2 SELV\/PELV-safety demarcation line in an AGL series circuit <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Figures Figure 1 \u2013 Safety demarcation line in a safetyextra low voltage system (SELV system) Figure 2 \u2013 Safety demarcation line in a protectiveextra-low voltage system (PELV system) <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 4.3 Environmental conditions 4.4 Degree of protection provided by enclosures 4.5 Electromagnetic compatibility (EMC) 4.5.1 Limits of electromagnetic emission 4.5.2 Limits of immunity 4.6 Marking 4.6.1 Marking of the SELV\/PELV power supply (single unit: safety transformer combined with a limiter) <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 4.6.2 Marking of the SELV\/PELV power supply (multiple units: safety transformer in series with a separate limiter) 4.6.3 Marking at the installation locations 4.7 Protection against electric shock 4.7.1 Basic requirements 4.7.2 Protective measure to be applied 4.7.3 Voltage limit for the SELV\/PELV circuit <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure 3 \u2013 Short-term non-recurring AC touch voltage limit <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 4.7.4 Protective separation from the primary series circuit Figure 4 \u2013 Short-term recurring peak touch voltage limit <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 4.7.5 Assemblies in the SELV\/PELV supply 4.8 Interfaces 4.8.1 Supply unit 4.8.2 Connectors 5 Useful methodic for a SELV\/PELV series circuit configuration 5.1 General <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 5.2 Method: systemic approach 5.3 Method: extended systemic approach (with limiter) 5.4 Verification of the chosen method 6 Testing 6.1 General <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 6.2 System design test 6.2.1 General 6.2.2 Test for the “systemic approach” method <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 6.2.3 Test for “extended systemic approach” method (device type test) Figure 5 \u2013 Test setup for type tests without limiter <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Figure 6 \u2013 Test setup for type tests with limiter <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 6.3 Production routine tests 6.3.1 Transformer test 6.3.2 Limiter test 6.4 Field test 6.4.1 Field test without additional limiter <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 6.4.2 Field test with additional limiter Figure 7 \u2013 Test setup for field tests without limiter <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Figure 8 \u2013 Test setup for field tests with limiter <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Annex A (informative)System design selection Tables Table A.1 \u2013 Comparison of characteristics of PELV and SELV <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Annex B (informative)Marking and hazard risk information B.1 Examples for marking Figure B.1 \u2013 Example for marking (luminaire, bolt, cable) Figure B.2 \u2013 Example for marking tags <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Figure B.3 \u2013 Example for field marking (elevated luminaires) Figure B.4 \u2013 Example for field marking (inset luminaires) <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | B.2 Hazard risk information Figure B.5 \u2013 Example for field marking (cables) Figure B.6 \u2013 Example for field marking (CCRs) <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | B.3 Measurement information B.3.1 Open running safety transformer Figure B.7 \u2013 Current time effect diagram for alternating current 15 Hz to 100 Hz(for ventricular fibrillation current pathway left hand to both feet) <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | B.3.2 65 VA safety transformer unloaded in a real series circuit Figure B.8 \u2013 Principle voltage shape of an openrunning safety transformer (output voltage) Figure B.9 \u2013 Voltage shape measured in a real circuit at an open running 65 W-transformer with a series circuit voltage of 384 V AC RMS and series current of 4,1 A <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | B.3.3 100 VA safety transformer unloaded with a quasi-sinewave primary current Figure B.10 \u2013 Voltage shape on the output of an unloaded safety transformer; measured secondary voltage of 47,49 V AC RMS and a peak-to-peak voltage of 265 V <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Annex C (informative)Additional information C.1 Determination of the peak voltage for SELV\/PELV applications C.1.1 Standards used C.1.2 Reason for using C.2 Case I sinusoidal voltage (SELV, PELV) <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Table C.1 \u2013 Total body impedances ZT for a current path hand to handfor small surface areas of contact in dry conditions at touch voltagesUT = 25 V to 200 V AC 50\/60 Hz (values rounded to 25 \u03a9) <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Figure C.1 \u2013 Conventional time\/current zones of effects of AC currents (15 Hz to 100 Hz) on persons for a current path corresponding to left hand to feet (see Table C.2) Table C.2 \u2013 Time\/current zones for AC 15 Hz to 100 Hz for hand to feet pathway \u2013 Summary of zones of Figure C.1 <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Table C.3 \u2013 Heart-current factor F for different current paths <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | C.3 Case II current pulses <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Figure C.2 \u2013 Probability of fibrillation risks for current flowingin the path left hand to feet <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Figure C.3 \u2013 Extracted data from IEC 60479-2:2019, Figure 23 Table C.4 \u2013 Estimate for ventricular fibrillation threshold after each pulseof current in a series of pulses each of which excited the heart tissue in sucha manner as to trigger ventricular responses <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Figure C.4 \u2013 Modified IEC 60479-2:2019, Figure 23 <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Figure C.5 \u2013 Peak voltage vs peak impulse duration <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Figure C.6 \u2013 Peak voltage vs peak impulse durationwith permissible (rectangular) pulses Figure C.7 \u2013 Open secondary voltage peak <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | Figure C.8 \u2013 Example \u2013 terp vs tmax comparison <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Electrical installations for lighting and beaconing of aerodromes – Safety secondary circuits in series circuits. General safety requirements<\/b><\/p>\n |