The role of civil defense sealed junction box grounding system

Air defense control junction box is closed and Difficulties galvanizing line, which is necessary because the furnace zone strip is heated to a temperature above the recrystallization scale, while the production line presents problems, speed is reduced or stopped, the temperature of the steel strip more Gao. Tensile strength of steel at low air defense sealed junction box, plastic is Gao. If the tension is relatively Gao, as well as the formation of the instantaneous tension high tension fluctuation will pull off the steel strip to form a cut-off incidents of attack. Air defense sealed junction box surface effect than in the same steel in the furnace conservative values ??smaller furnace to improve and increase the heat. Therefore, to ensure the normal operation of the steel strip tension conditions in the furnace as low as possible is necessary. But under normal circumstances, air defense sealed junction box will narrow the width of the strip must form values, it is necessary to rely on the proper selection of raw materials to add the width of rolled hard to compensate. When electrical equipment or electrical lines damaged insulation ground fault occurs, the exposed conductive parts of the fault zone voltage, human contact with the exposed conductive parts of the fault voltage electrical shock suffered an electric shock called indirect contact. Air defense protection measures to prevent indirect contact hermetic junction box shock usually six: ① automatically cut off ground fault circuit; ② Ⅱ use electrical equipment; ③ electrical isolation; ④ with isolated extra low voltage power supply; ⑤ insulating place; ⑥ use equipotential bonding.