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.

低壓抽屜柜附件廠家曾經對柜內溫度實測，在柜子安裝排氣風扇的情況下，如果配電室無有空調，夏季柜內溫度達到55℃(元件周圍空氣溫度即為該元件的環境溫度)，加之排氣扇使用壽命不長，連續使用，很難堅持常久，真是雪上加霜，造成柜內熱繼電器跳閘，接線端子燒得發黑，不但事故頻發，而且元件使用壽命也大打折扣。

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.
                     

低壓抽屜柜正常使用的環境溫度，周圍空氣溫度不超過40℃(上限)，一般地區為-5℃(下限)，嚴寒地區可以為-15℃。環境溫度過高，金屬的導電率會減低，電阻增加，表面氧化作用加劇；另一方面，過高的溫度，也會使柜內的絕緣件的壽命大大縮短，絕緣強度下降。反之，環境溫度過低，在絕緣件中會產生內應力，終會導致絕緣件的破壞。

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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