【2025 Little Knowledge】Methods for installing cable entry devices
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This post was last edited by zhoudingshengs on 2025-1-17 08:55. Methods for installing cable entry devices: Cable entry devices are classified according to their sealing methods into two types: those with elastic sealing rings and those sealed using fillers. I. Structural requirements for cable entry devices with elastic sealing rings 1. If the cable entry device can use sealing rings with the same outer diameter but different inner diameters, then the minimum uncompressed axial sealing height of the sealing ring (i.e., the gap length) between the housing of the cable entry device and the sealing ring, as well as between the sealing ring and the cable, shall be: (1) 20 mm for circular cables with a diameter not exceeding 20 mm and for non-circular cables with a perimeter not exceeding 60 mm. (2) 25 mm for circular cables with a diameter greater than 20 mm and for non-circular cables with a perimeter greater than 60 mm. 2. If the cable entry device or conduit sealing device can only use specialized elastic sealing rings, the minimum non-compressible axial sealing length of such rings shall be 5 mm between the cable entry device and the sealing ring, as well as between the sealing ring and the cable. II. Structural requirements for cable entry devices sealed with packing 1. The minimum length of the packing during installation should be 20 mm. 2. The manufacturer shall specify: (1) The sealed joint shall permit the use of the maximum outer diameter of the cable core wire. (2) Number of core wires with the most fillers. 3. The values specified in these rules shall ensure that at each point along the 20 mm length of the sealing packing, at least 20% of the cross-sectional area is filled by the packing. 4. The cable lead-in device shall be able to be assembled to the electrical equipment after the specified curing time of the filler, and shall be able to be removed from the equipment without compromising the sealing integrity of the filler.
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【2025 Fun Fact】Methods of installing cable entry devices. Cable entry devices are classified based on their sealing methods into two types: those with elastic sealing rings and those sealed using packing. I. Structural requirements for cable entry devices with elastic sealing rings 1. If the cable entry device can use sealing rings with the same outer diameter but different inner diameters, then the minimum non-compressed axial sealing height of the sealing ring (i.e., the gap length) between the housing of the cable entry device and the sealing ring, as well as between the sealing ring and the cable, shall be: – 20 mm for circular cables with a diameter not exceeding 20 mm and for non-circular cables with a perimeter not exceeding 60 mm. - It is 25 mm for circular cables with a diameter greater than 20 mm and for non-circular cables with a perimeter greater than 60 mm. 2. If the cable entry device or conduit sealing device can only use specialized elastic sealing rings, the minimum non-compressible axial sealing length of such rings shall be 5 mm between the cable entry device and the sealing ring, as well as between the sealing ring and the cable. II. Structural requirements for cable entry devices sealed with packing 1. The minimum length of the packing at the time of installation should be 20 mm. 2. The manufacturer shall specify that: – the sealing joint allows the use of the maximum outer diameter of the cable core wire. - Number of core wires with the most filler. 3. The values specified in these rules shall ensure that at each point along the 20 mm length of the sealing packing, at least 20% of the cross-sectional area is filled by the packing. 4. The cable entry device shall be able to be assembled onto the electrical equipment after the specified curing time of the filler, and shall be able to be removed from the equipment without compromising the sealing integrity of the filler. .