1、 The protective wire of the distribution box is connected reliably.

2、 No bare electrified body shall be exposed outside the cabinet (box); the electrical elements to be installed on the external surface of the cabinet (box) or the distribution board shall be provided with screen protection.

3、 The electrical components, instruments, switches and lines of the distribution box shall be arranged in order, installed firmly and operated conveniently; the cabinet (box) shall be free of dust, water and sundries.

4、 The distribution box shall be made of non combustible materials.

5、 The bottom surface of the floor mounted distribution cabinet (box) shall be 50-100mm higher than the ground; the height of the operating handle is generally 1.2-1.5m; there shall be no obstacles within the range of 0.8-1.2m in front of the cabinet (box).

6、 For production sites and offices with small electric shock risk, open type distribution boards can be installed.

7、 Closed cabinet shall be installed in processing workshop, casting, forging, heat treatment, boiler room, carpentry room and other places with high risk of electric shock or poor working environment.

8、 Enclosed or explosion-proof electrical facilities shall be installed in hazardous workplaces with conductive dust or flammable and explosive gas.