metal mcb electrical distribution boxes Introduction:
Metal distribution box is made of high-quality cold roll steel,designed to be assembled with various electrical componets according to different control function requirement.
metal mcb electrical distribution boxes is suitable for construction site and outdoor temporary power use, should meet the "three-level distribution two-level leakage protection, one machine one gate one leakage one box" distribution and maintenance application requirements.
Distribution box, switch box material selection, manufacturing process, selection of electrical components in the box, configuration should conform to the relevant national standards, products should pass CCC certification.
The shell of the distribution box is made of cold rolled steel plate, which is rainproof, dustproof and outdoor. The thickness of the steel plate conforms to the requirements of the specification and is durable.
The distribution box and switch box should be separately equipped with N wire and PE wire terminal boards, and the incoming and outgoing wires must be connected firmly through the terminal boards.
N wire terminal board must be insulated from metal electrical device board; The PE wire terminal board must be electrically connected with the metal electrical device board. The N wire in the incoming and outgoing lines must be connected through the N wire terminal board; The PE cable must be connected through the PE terminal board.
The PE wire must be connected to the terminal board by electrical connection. The number of electrical connection points should be two more than the number of circuits in the box. One is the connection point for the PE wire to enter the box, and the other is the connection point for repeated grounding.
The cause of the Metal Mcb Electrical Distribution Boxes fire
1, leakage fire: The so-called leakage, is a certain place of the line because of some reason (natural or man-made reasons, such as wind and rain, damp, high temperature, touch pressure, scratch, friction, corrosion, etc.) make the insulation of wire or support material insulation ability to decline, Causing a portion of current to flow between wires (through damaged insulation, support, etc.) and wires and the earth (through steel bars in cement walls, tinplate, etc.) is a phenomenon called leakage. When the leakage occurs, the leakage current in the way of flowing into the ground, such as in the case of large resistance parts, will produce local high temperature, resulting in the nearby combustible fire, thus causing a fire. In addition, the leakage of electric spark generated at the leakage point, also can cause fire.
2, short circuit fire: electrical lines in the bare wire or insulation wire insulator damage, live line and adjacent line, or live line and ground wire (including the ground belongs to the earth) at a certain point together, causing a sudden large increase in current phenomenon is called short circuit, commonly known as touch line, mixed line or electricity. Because suddenly reduce the resistance when short circuit, current increases suddenly, the instantaneous heat is big, considerably more than the normal operating line of heat, and in the sparks of short-circuit point is easy to produce strong and arc, not only can make the rapid burning insulation, and can make the metal melting, cause near flammable fuel combustion, causing a fire.
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