IEC/TS 62396-4:2008(E) is intended to provide guidance on atmospheric radiation effects on high voltage (nominally above 200 V) avionics electronics used in aircraft operating at altitudes up to 60 000 ft (18,3 km). To be used in conjunction with IEC/TS 62396-1. Defines the effects of that environment on high voltage electronics and provides design considerations for the accommodation of those effects within avionics systems. Is intended to help aerospace equipment manufacturers and designers to standardise their approach to single event effects on high voltage avionics by providing guidance, leading to a standard methodology.