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The method of introducing the explosion-proof filler: sealing the insulated wire through the shell wall portion to achieve the explosion-proof effect. Asbestos, fiberglass, synthetic rubber, or other materials having suitable elasticity, heat resistance, and good insulation are generally used. A cable clamp plate and a cable protection tube are installed outside the packing gland to prevent the filler portion from being damaged by an external force. When introducing steel belt armored cable (including corrugated steel pipe armor) with flameproof packing type, the anti-corrosion layer and steel tape armor penetrating through the inlet of the junction box shall be peeled off.
The introduction method of the flameproof type potting: the introduction mode of the flameproof type potting means that the mixed packing is filled into the insulating wire through wall portion, so that the through wire is fixed. This method is only suitable for low voltage circuits. At the entrance of the outlet box for the introduction of rubber or plastic cables, the seal shall be kept in flameproof performance, and a cable protection tube must also be installed. The filling depth of the sealed mixed packing should be more than 1.5 times the diameter of the cable introduction (minimum 40 mm). There should be a mark in the introduction port indicating the required filling amount. A cable compression plate shall be provided at the inlet to protect the cable of the sealed part from pressure.
The structural shape and size of the mixed filling chamber should be such that the mixed packing can be completely adhered to the through-line and the wall of the filling chamber. The inner wall of the filling chamber should be convex and concave to prevent the hardened mixed filler from falling off. The number of through wires should generally not exceed 9. Use baffles, guides, etc. to be symmetrical as far as possible, the distance between the through wires and the inner wall of the filling cavity is, in principle, more than 1/2 of the outer diameter of the wire (minimum 2 mm). 
Explosion-proof camera tube--the construction of metal tube 1. The method of piping:
1. Threaded connection: The electric wire tube and its accessories are connected with the electrical equipment outlet box, generally using threaded connection (thread and tube thread). The effective engagement part of the threaded connection is more than 6 buckles and is firmly tightened with a lock nut.
2, flexible connection: the need to use flexible connection piping, you must use the flexible joint of the flameproof structure. The inner radius of the bent portion of the joint is more than 5 times the outer diameter of the tube of the flexible joint.
Second, the requirements of sealing technology When the wire pipeline passes through the partition wall between the 1-1 dangerous zone and other zones, the sealing joint can be placed on either side of the partition wall, but between the sealing joint and the partition wall There must be no seams in the conduit. Sealing joints in wire ducts of more than 2 inches shall in principle be installed within 45 cm of the junction box or other boxes and as close as possible.
Third, the filling of the sealing mixed filler requires filling and sealing mixed filler should be as airtight as possible, the wire and mixed filler should be completely applied between the covering layer of each wire and the inner wall of the sealing joint. In any case, the effective length of the filling layer shall not be less than the inner diameter of the conduit (minimum 20 mm). After filling the packing and confirming that it has fully met the requirements, screw it into the filling port tightly with a tap. )
Explosion-proof camera wiring - cable installation workers first select the appropriate cable according to the place of use, such as cable with rubber, plastic sheath, or metal armored cable. For cables with corrosive gases or liquids, the cables used must be considered for corrosion protection. When the cable is introduced into the junction box by using the flameproof packing introduction method, the cable cross section should be round, and the surface of the sheath must not have unevenness. )
When cable wiring is used in the area 1 area, the cable must be a copper core armored cable, and a plastic sleeve (rubber sleeve) cable can be used in the 2nd area. The armored cable should be a PVC insulated (core) PVC inner and outer sheathed steel tape armored cable. When the armored cable is introduced into the electrical equipment, the internal grounding wire is connected with the internal grounding bolt of the equipment; the outer steel strip and the metal outer casing shall be connected with the grounding bolt outside the equipment, and the rubber sealing ring shall not be directly pressed on the armored steel strip, and the steel strip The other end must also be reliably grounded.
Hazardous places electrical wiring generally has two types of cable wiring and steel pipe wiring. Insulated wires shall not be applied except for overhead, and must be wired through metal pipes. Bridges, trays, splints, etc. can be used for rubber or plastic sheathed cables. Avoid using cable trenches (water traps, gas accumulation, and accidents). If the cable trench cannot be avoided, it should be filled with sand and filled. Mobile devices must be cabled and cabled.
[ Huaqiang Security Network News ] Explosion-proof camera "wiring" matters External wiring and electrical equipment connection Explosion-proof thread introduction method: the effective part of the thread engagement should be guaranteed above 6 buckles, to meet the "thread explosion-proof" technical requirements . To ensure that the threads are fully engaged, lock them with nuts. Explosion-proof metal sleeve type introduction method: refers to a pipe member composed of a pressure ring and a nut mainly composed of a flanged metal sleeve. The second introduction method is applicable to the level 1 and level 2 explosion levels. The through-cable cable uses a rubber-insulated flexible cable with a metal sheath, a linen-insulated cable, or a vinyl-insulated cable. Other cables of the same performance can also be used. The maximum allowable value of the gap between the inner surface of the metal sleeve and the outer circumference of the cable, that is, the diameter difference is 0.2 mm, the minimum allowable value of the gap length is 25 mm, and the inner diameter of the sleeve should be less than 0.15 mm of the standard outer diameter of the cable.