If the low-voltage drawer cabinet adopts IP40 protection level, it is necessary to strengthen forced ventilation and heat dissipation, that is, to add an exhaust fan on the top of the cabinet. If there are more drawers, there will be more partitions in the cabinet. In addition, the air flow resistance of the bottom plate and top plate of the cabinet is very large, and the forced ventilation effect is not significant.

低压抽屉柜附件厂家曾经对柜内温度实测，在柜子安装排气风扇的情况下，如果配电室无有空调，夏季柜内温度达到55℃(元件周围空气温度即为该元件的环境温度)，加之排气扇使用寿命不长，连续使用，很难坚持常久，真是雪上加霜，造成柜内热继电器跳闸，接线端子烧得发黑，不但事故频发，而且元件使用寿命也大打折扣。

The manufacturer of low-voltage drawer cabinet accessories once measured the temperature inside the cabinet. When the cabinet is installed with exhaust fan, if there is no air conditioner in the distribution room, the temperature inside the cabinet reaches 55 ℃ in summer (the air temperature around the component is the ambient temperature of the component). In addition, the exhaust fan has a short service life and is used continuously, so it is difficult to persist for a long time, The black terminals not only cause frequent accidents, but also greatly reduce the service life of components.
                     

低压抽屉柜正常使用的环境温度，周围空气温度不超过40℃(上限)，一般地区为-5℃(下限)，严寒地区可以为-15℃。环境温度过高，金属的导电率会减低，电阻增加，表面氧化作用加剧；另一方面，过高的温度，也会使柜内的绝缘件的寿命大大缩短，绝缘强度下降。反之，环境温度过低，在绝缘件中会产生内应力，终会导致绝缘件的破坏。

The ambient temperature for normal use of low-voltage drawer cabinet is no more than 40 ℃ (upper limit), generally - 5 ℃ (lower limit), and - 15 ℃ in severe cold area. If the ambient temperature is too high, the conductivity of the metal will decrease, the resistance will increase, and the surface oxidation will intensify; On the other hand, too high temperature will greatly shorten the life of the insulation parts in the cabinet and reduce the insulation strength. On the contrary, if the ambient temperature is too low, internal stress will be produced in the insulation parts, which will eventually lead to the damage of the insulation parts.

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