DIN EN IEC 61820-3-4:2025-02

This International Standard 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 standard 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 standard 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. With few exceptions, aeronautical ground lighting is designed for series circuit technology and operation with constant current and a maximum input AC voltage of 5 000 V RMS, including tolerances. The input voltage at the series circuit is constantly adjusted by the constant current regulator so that it can be kept constant regardless of the load on the series circuit. The characteristics and rated values of the constant current regulator comply with those specified in IEC 61822. Due to the design of a series circuit, that is a series connection of all loads, the usual protective devices for personnel protection in an IT, TT, or TN network cannot be used. aeronautical ground lighting is defined as any light provided to assist air traffic control and are therefore subject to special requirements in terms of reliability, availability, and ease of maintenance. For this reason, insulation faults in the series circuit are often tolerated and do not result in the automatic shutdown of the power supply of the series circuit.