1.The shell is formed by steel plates of high grade,the transparent enclosure is
   pressed to formation by polycarbonate.
2.Integrated body is fully sealed for waterproofig and dust-proofing.
3.Inner explosion-proof single-pole can be started up momentarily.
4.The ballast is treated by cast and seal,the electronic or inductive type 
   be available.
5.The emergency device may be installed as required,which consists of
   controller and cadium battery.The controller has functions of charging and
  discharging  over-voltage.
6.Suitable for GB3836-2000,IEC60079standard request.