Mining Flameproof Movable Substations

Service conditions
1. The installation is not nigher than 1000m (usual normal), special Environment gives explanation in addition.
2. Ambient temperature
Highest temperature: 40º C
Maximum monthly average temperature: 30º C
Maximum annual temperatures: 20º C
Lowest temperatures: -5º C
3. The surrounding air relative humidity is not greater than 95% (25º C );
4. In the mine, with methane, dust, explosion danger is well;
5. No vibration the gradient is less than 15;
6. No gas or steam to corrade metal or destroy insulation;
7. Non- water drop site;
8. Voltage profile is approximate to the sine wave;
9. The three-phase supply voltage approximate symmetrical.
Note: When exceed this condition stipulation, consultation is needed.