- Height above Sea Level: <2000m
- Ambient Medium Temperature:< +40 degree C >-5 degree C
- It can endure the effect of humid air and the effect of humid air and the effect of salt mist, oil mist and fog bacteria.
- In the place within the midium without danger of explosion and without corrosion of metal box, damage of insulation gases and conductive dust.
- No damage of rain and snow
- Pollution degree: 3