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eLibrary > BS EN IEC 61820-3-4:2023 Electrical installations for lighting and beaconing of aerodromes - Safety secondary circuits in series circuits. General safety requirements >

BS EN IEC 61820-3-4:2023 Electrical installations for lighting and beaconing of aerodromes - Safety secondary circuits in series circuits. General safety requirements, 2023

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BS EN IEC 61820-3-4:2023 Electrical installations for lighting and beaconing of aerodromes - Safety secondary circuits in series circuits. General safety requirements, 2023

undefined [Go to Page]
Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, and abbreviated terms [Go to Page]
3.1 Terms and definitions
3.2 Abbreviated terms
4 Requirements for the SELV/PELV supply [Go to Page]
4.1 General
4.2 SELV/PELV-safety demarcation line in an AGL series circuit
Figures [Go to Page]
Figure 1 – Safety demarcation line in a safetyextra low voltage system (SELV system)
Figure 2 – Safety demarcation line in a protectiveextra-low voltage system (PELV system)
4.3 Environmental conditions
4.4 Degree of protection provided by enclosures
4.5 Electromagnetic compatibility (EMC) [Go to Page]
4.5.1 Limits of electromagnetic emission
4.5.2 Limits of immunity
4.6 Marking [Go to Page]
4.6.1 Marking of the SELV/PELV power supply (single unit: safety transformer combined with a limiter)
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 [Go to Page]
4.7.1 Basic requirements
4.7.2 Protective measure to be applied
4.7.3 Voltage limit for the SELV/PELV circuit
Figure 3 – Short-term non-recurring AC touch voltage limit [Go to Page]
4.7.4 Protective separation from the primary series circuit
Figure 4 – Short-term recurring peak touch voltage limit [Go to Page]
4.7.5 Assemblies in the SELV/PELV supply
4.8 Interfaces [Go to Page]
4.8.1 Supply unit
4.8.2 Connectors
5 Useful methodic for a SELV/PELV series circuit configuration [Go to Page]
5.1 General
5.2 Method: systemic approach
5.3 Method: extended systemic approach (with limiter)
5.4 Verification of the chosen method
6 Testing [Go to Page]
6.1 General
6.2 System design test [Go to Page]
6.2.1 General
6.2.2 Test for the "systemic approach" method
6.2.3 Test for "extended systemic approach" method (device type test)
Figure 5 – Test setup for type tests without limiter
Figure 6 – Test setup for type tests with limiter
6.3 Production routine tests [Go to Page]
6.3.1 Transformer test
6.3.2 Limiter test
6.4 Field test [Go to Page]
6.4.1 Field test without additional limiter
6.4.2 Field test with additional limiter
Figure 7 – Test setup for field tests without limiter
Figure 8 – Test setup for field tests with limiter
Annex A (informative)System design selection
Tables [Go to Page]
Table A.1 – Comparison of characteristics of PELV and SELV
Annex B (informative)Marking and hazard risk information [Go to Page]
B.1 Examples for marking
Figure B.1 – Example for marking (luminaire, bolt, cable)
Figure B.2 – Example for marking tags
Figure B.3 – Example for field marking (elevated luminaires)
Figure B.4 – Example for field marking (inset luminaires)
B.2 Hazard risk information
Figure B.5 – Example for field marking (cables)
Figure B.6 – Example for field marking (CCRs)
B.3 Measurement information [Go to Page]
B.3.1 Open running safety transformer
Figure B.7 – Current time effect diagram for alternating current 15 Hz to 100 Hz(for ventricular fibrillation current pathway left hand to both feet) [Go to Page]
B.3.2 65 VA safety transformer unloaded in a real series circuit
Figure B.8 – Principle voltage shape of an openrunning safety transformer (output voltage)
Figure B.9 – 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 [Go to Page]
B.3.3 100 VA safety transformer unloaded with a quasi-sinewave primary current
Figure B.10 – 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
Annex C (informative)Additional information [Go to Page]
C.1 Determination of the peak voltage for SELV/PELV applications [Go to Page]
C.1.1 Standards used
C.1.2 Reason for using
C.2 Case I sinusoidal voltage (SELV, PELV)
Table C.1 – 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 Ω)
Figure C.1 – 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 – Time/current zones for AC 15 Hz to 100 Hz for hand to feet pathway – Summary of zones of Figure C.1
Table C.3 – Heart-current factor F for different current paths
C.3 Case II current pulses
Figure C.2 – Probability of fibrillation risks for current flowingin the path left hand to feet
Figure C.3 – Extracted data from IEC 60479-2:2019, Figure 23
Table C.4 – 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
Figure C.4 – Modified IEC 60479-2:2019, Figure 23
Figure C.5 – Peak voltage vs peak impulse duration
Figure C.6 – Peak voltage vs peak impulse durationwith permissible (rectangular) pulses
Figure C.7 – Open secondary voltage peak
Figure C.8 – Example – terp vs tmax comparison
Bibliography [Go to Page]

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BS EN IEC 61820-3-4:2023 Electrical installations for lighting and beaconing of aerodromes - Safety secondary circuits in series circuits. General safety requirements, 2023

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please select your company type below: