These equipment are suitable to be installed in places in which, during the
normal activities, explosive atmosphere caused by gases, vapours, mists or
caused by mixture of air and combustible dust are likely to occur.
They type of protection flameproof “d”.
They are normally used for installation on smokestacks, towers, high buildings
as obstructions signal.
The equipment are conform to ICAO Annex 14 – Vol.1 “Aerodrome Design
and Operation” chapter 6 (July 2004) international rules.