BS EN 50490:2009 pdf free download – Electrical installations for lighting and beaconing of aerodromes – Technical requirements for aeronautical ground lighting control and monitoring systems – – Units for selective switching and monitoring of individual lamps.
4 General requirements
4.1 Electrical connections
Where a unit is provided with leads and/or connectors for connection to the primary or secondary side of an AGL series circuit these shall comply, where applicable, with the requirements of EN 61823 stated below:
• mechanical characteristics of connectors;
• electrical characteristics of the leads and connectors;
• mechanical strength of the interface of all leads with the unit, where the unit is intended to be handled in the same way as a series circuit transformer.
4.2 Enclosure for indoor units
Units, intended for indoor use, shall provide protection at least according to IP 20 (EN 60529).
4.3 Enclosure for outdoor units
Units, intended for outdoor use, shall provide protection at least according to IP 68 (EN 60529). In case the unit is intended for connection only to the secondary and only for installation above ground, the IP-rating can be reduced to IP 54 (EN 60529). The housing material shall comply with the applicable requirements of EN 61823.
4.4 Mechanical impact protection
The protection degree against external mechanical impacts (code 1K EN 62262) shall be announced by the manufacturer in the product data sheet.
4.5 Earthing
Any exposed conductive part of the housing shall be provided with an external earthing terminal to enable independent safety earth connection.
4.6 Service temperature and humidity
For outdoor units the ambient temperature range shall be at least — 25 °C to + 55 °C. For indoor units the ambient temperature range shall be at least 0 °C to + 50 °C. The range for relative humidity shall be from 10 % to 95 % non-condensing. Where higher humidity rating is required or where condensing can be expected, the unit shall be designed as intended for underground use. See 4.3.
4.7 Reliability
The MTBF of the unit shall be published in the manufacturer’s technical data.
4.8 Electrical characteristics
4.8.1 Current range
The unit shall operate in the current range corresponding to the provisions contained in EN 61822 and EN 61823.
4.8.2 Voltage range
The unit shall operate in the voltage range corresponding to the provisions contained in EN 61822.
4.8.3 Protection level
Where a unit, intended to be connected to a series circuit (directly or indirectly via a series circuit transformer), provides an electrical connection to an external low voltage system, the unit shall be designed such that this external system is protected against the maximum voltage of the series circuit as specified in EN 61822 for the maximum rated CCR.
4.8.4 Load range
The maximum and minimum loads and the types of loads to be connected to the unit shall be published in the manufacturer’s technical data.
4.8.5 Power consumption
The active and reactive power consumption of the unit at each operating mode shall be published in the manufacturer’s technical data.
4.8.6 Current reduction
The unit shall not reduce the current available to the lamp by more than 10 mA when the lamp is illuminated regardless of the selected brightness step on the CCR.
NOTE 10 mA is considered to have an insignificant effect on the light output of the lamp.
4.8.7 Electromagnetic compatibility (EMC)
4.8.7.1 Limits for emission
The units shall comply with EN 61000-6-3, excluding EN 61000-3-2 / EN 61000-3-12 and EN 61000-3-3 / EN 61000-3-11.