DIN EN 61821:2012
机场照明和航路信标电气设备.航空用地面照明恒流串联电路的维修(IEC 61821-2011).德文版本EN 61821-2011
Electrical installations for lighting and beaconing of aerodromes - Maintenance of aeronautical ground lighting constant current series circuits (IEC 61821:2011); German version EN 61821:2011