The surrounding temperature must be less equal to +40 and over equal to -5. The average temperature within 24hours must be less equal to +35. If so, capacity should be dropped according to the practical situations.

Used indoors. The altitude of the using location should be less equal to 2000m.

When the highest temperature is 40, the relative humidity of the temperature of the surrounding air must be less equal to 50%. At the lowest temperature, a higher relative humidity is allowed: For example, 90% when it is +20. The influence of the occasional appearance of the moist because of the variety of the temperature should be taken into consideration.

The verticality of the installing device should be less equal to 5° And the whole group of boards should be relatively level. (meet the GBJ232-82 criteria)

The Low-Voltage Switchboards should be installed in places without strenuous vibration and thrashing and not enough to corrode the electric components.

If the users have special requirements, they can contact the producer and solve them together.