1), the Shore hardness of the sealing ring is 45 ~ 50 degrees, otherwise it is a blind fire. When wiring, the layered side of the sealing ring faces the wiring cavity, otherwise it will be incomplete (except for the coal electric drill).
2) The size of the sealing ring shall meet the following requirements, and one that does not meet the requirements is lost explosion.
① a. When the outer diameter of sealing ring is less than or equal to 20mm, the difference between the outer diameter of sealing ring and the inner diameter of wiring device is less than or equal to1mm..
B if the outer diameter of the sealing ring is less than 60mm or more than 20mm, the difference between the outer diameter of the sealing ring and the inner diameter of the wiring device is less than or equal to1.5mm.
C if the outer diameter of the sealing ring is greater than 60mm, the difference between the outer diameter of the sealing ring and the inner diameter of the wiring device is less than or equal to 2mm.
② The difference between the inner diameter of sealing ring and the outer diameter of cable is less than1mm..
③ The width of the sealing ring shall not be less than 0.7 times of the cable outer diameter and not less than 10 mm. ..
④ The thickness of the sealing ring shall not be less than 0.3 times of the cable outer diameter (except for cables with a diameter of 70mm2) and not less than 4mm.
3) The sealing ring is not damaged, so it shall not be cut and used. No other objects may be wound between the cable and the sealing ring.
4) Joints without cables shall be sealed and pressed by sealing rings and steel baffles with a thickness of not less than 2mm. The sealing ring is placed in the steel baffle.
5) There is allowance for the pressure connection pipe, and a metal washer is added between the connection pipe and the sealing ring.