Technical requirements
Normal usage conditions
Surrounding air temperature
The ambient air temperature should not exceed 40 ℃, and its average temperature should not exceed 35 ℃ within 24 hours. The lower limit of ambient temperature: -5 ℃ for indoor bus ducts, -25 ℃ for outdoor bus ducts (temperate areas), -50 ℃ (severe cold areas). Note: For bus ducts used in severe cold areas, manufacturers need to reach a specific agreement with users. Indoor bus ducts should have clean air under atmospheric conditions, and their relative humidity should not exceed 50% when the highest temperature is 40 ℃. Large relative humidity is allowed when the temperature is low, such as 90% at 20 ℃. However, occasional condensation due to humidity changes should be considered. When the maximum temperature of outdoor bus duct is 25 ℃, the relative humidity can reach up to 100% in a short time. The elevation of the installation site shall not exceed 2000 meters The pollution level is selected as pollution level 3 according to the provisions of GB 7251.1-2005 Special usage conditions: When any of the following special usage conditions exist, they must be specified in the specific product technical documents or resolved through negotiation between the user and the manufacturer: a) The temperature, humidity, altitude, etc. specified in 4.1.1 are different. b) During use, sudden changes in temperature or atmospheric pressure can cause abnormal condensation in the busbar duct
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