... working under the field operations conditions such as drilling crew, ZYD, logging, geophysical exploration, construction ... divided into rooms, living room, office rooms, tools Room, equipment room, boiler room, electric generator ... snow and sandstorm. 2. Adopting EPS, PU, rock cotton etc., which are the heat insulation, sound ... 75% and ambient temperature is 15-35 °C.When the voltage is less than 500V, ...