一、规定与要求1、外表面温度范围在正常运行中,机械或电气元性的外表面温度不得超过150℃。2、电气间隙带电部分与机壳之间的间隙将足以使电弧放电的可能性减少到最小。当空间受到限制时,机壳内要衬以附加绝缘。3、绝缘材料分解出的可燃气体(1)在电的作用下,放出可燃或爆炸 A, the provisions and requirements 1, the outer surface temperature range In normal operation, the mechanical or electrical surface temperature of the outer element shall not exceed 150 ℃. 2, the gap between the live part of the electrical clearance and the case will be enough to minimize the possibility of arc discharge. When space is limited, the enclosure must be lined with additional insulation. 3, combustible gas decomposed from insulating materials (1) under the action of electricity, emit flammable or explosive