Explosion proof stuffing boxes are widely used for sealing cables in explosion-proof electrical products, commonly including stuffing type cable entry devices and stuffing type conduit sealing devices.
The filler type cable entry device is generally installed at the connection between the cable port and the explosion-proof equipment. By directly inserting the filler into the inner cavity and compacting it with bolts, the purpose of sealing is achieved. At the same time, it can prevent external grease, water stains, or some media from entering and interfering with the cable, which will affect the operation of explosion-proof equipment and the service life of explosion-proof equipment. It is generally suitable for places with harsh environments, such as offshore oil platforms, and equipment with high explosion-proof requirements, such as IIC explosion-proof products.
The packing type conduit sealing device is mainly used in the conduit wiring of explosion-proof equipment. It plays an isolation role at the joints of the electrical circuit to prevent explosive energy from being transmitted from one place to the entire electrical system. Common examples include isolation sealing boxes.
Regarding the sealing requirements for stuffing boxes, there are provisions in C2.1.2 and C2.1.3 of GB3836.2-2010:
The minimum length of the filler during installation should be 20mm.
Manufacturers should specify:
——Sealed joints allow the use of cable core wires with a maximum outer circle diameter of:
——The maximum number of core wires filled with fillers.
These specified values should ensure that at least 20% of the cross-sectional area at each point along the 20mm length of the sealing packing is filled with packing.
The cable entry device should be able to be assembled onto electrical equipment after the specified filling solidification period, and can be removed from the equipment without damaging the sealing of the filling.
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