1. The installation height shall not exceed 1000m above sea level.
2. Ambient temperature: maximum temperature + 40 ℃; hottest monthly average temperature + 30 ℃; maximum annual average temperature + 20 ℃; minimum temperature - 5 ℃.
3. The relative humidity of ambient air should not exceed 95% (+ 25 ℃).
4. In the mine with methane gas mixture and coal dust and explosion risk.
5. There is no strong turbulence, vibration and the inclination of the vertical plane does not exceed 15 degrees.
6. There is no gas and vapor that can corrode metal and damage insulation.
7. No dripping place.
8. The waveform of power supply voltage is similar to sine wave.
9. The three-phase power supply voltage is approximately symmetrical.
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