In non-steel material base (such as Bakelite, plastic) on the line pile connection to install the course of its accident as follows: room temperature, the power inlet and outlet (usually connected to pressure lugs) Online piles on compaction, line body between the solid phase. Energized, the line nose and fever, after a period of time, resulting in basal aging, softening deformation, reduction of pressure in the thread between the loose, have a gap, so that the effective contact area to reduce the contact surface is the same as the fuse to produce very brief, large current flow control line nasal contact points due to overcurrent, overheating, so that the base further deformation, and so on, until the line hair red melting stud nut burned out or line of skin on fire, the last accident.
Vibration fastening installation to connect the power cord vibration parts, namely, spring washer, the connection line of the body assembly pressed to avoid even the money loose due to vibration during transportation. Working after power lines and thread fever, more than a certain temperature and time, the spring is annealed (heat treatment process terminology), spring washers to lose elasticity, the thread due to pressure to reduce the occurrence of gaps and loose, and finally referred to in the first situation.
Bending and peeling line directly connecting (wireless nose) to install the power cord to the installation of line compression, by the outside diameter of the contact between the wires, the contact area is much smaller than the wire cross section. Energized, the contact points have a serious choke phenomenon, quickly heat until hot wire rapid softening. Under the pressure of the nut, the diameter crushed smaller gap between the wires, the effective contact area is reduced and finally cause a fire.
      4 power cord stripping screws tight due to the installation of peeling, light wire diameter screw crimp in the wiring base, rely on outside diameter and screw contacts, the contact area is much smaller than the wire section. Energized, have a serious choke phenomenon wire is touching at the fever rapidly softening, wire screw crushed smaller and have a gap between the screw and reduce the effective contact area caused by overcurrent, overheating, and finally cause a fire

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