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BS EN IEC 61820-3-4:2023

BS EN IEC 61820-3-4:2023

$198.66

Electrical installations for lighting and beaconing of aerodromes – Safety secondary circuits in series circuits. General safety requirements

Published By Publication Date Number of Pages
BSI 2023 52
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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.

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PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
13 1 Scope
2 Normative references
14 3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
17 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
18 Figures
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)
19 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)
20 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
21 Figure 3 – Short-term non-recurring AC touch voltage limit
22 4.7.4 Protective separation from the primary series circuit
Figure 4 – Short-term recurring peak touch voltage limit
23 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
24 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
25 6.2 System design test
6.2.1 General
6.2.2 Test for the “systemic approach” method
26 6.2.3 Test for “extended systemic approach” method (device type test)
Figure 5 – Test setup for type tests without limiter
27 Figure 6 – Test setup for type tests with limiter
28 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
29 6.4.2 Field test with additional limiter
Figure 7 – Test setup for field tests without limiter
30 Figure 8 – Test setup for field tests with limiter
31 Annex A (informative)System design selection
Tables
Table A.1 – Comparison of characteristics of PELV and SELV
32 Annex B (informative)Marking and hazard risk information
B.1 Examples for marking
Figure B.1 – Example for marking (luminaire, bolt, cable)
Figure B.2 – Example for marking tags
33 Figure B.3 – Example for field marking (elevated luminaires)
Figure B.4 – Example for field marking (inset luminaires)
34 B.2 Hazard risk information
Figure B.5 – Example for field marking (cables)
Figure B.6 – Example for field marking (CCRs)
35 B.3 Measurement information
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)
36 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
37 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
38 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)
39 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)
40 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
41 Table C.3 – Heart-current factor F for different current paths
42 C.3 Case II current pulses
43 Figure C.2 – Probability of fibrillation risks for current flowingin the path left hand to feet
44 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
45 Figure C.4 – Modified IEC 60479-2:2019, Figure 23
46 Figure C.5 – Peak voltage vs peak impulse duration
47 Figure C.6 – Peak voltage vs peak impulse durationwith permissible (rectangular) pulses
Figure C.7 – Open secondary voltage peak
49 Figure C.8 – Example – terp vs tmax comparison
50 Bibliography

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