Power distribution center (hereinafter referred to as
The cabinet is divided into four compartments:
Horizontal busbar compartment: at the rear of the cabinet; Functional unit compartment: located on the upper or left side of the cabinet front;
Cable compartment: located in the lower part or right side of the cabinet front; Control circuit compartment: located in the upper front of the cabinet;
Separation measures: The horizontal busbar compartment is separated from the functional unit compartment and cable compartment using melamine phenolic flat core plates or steel plates.
The control circuit compartment and the functional unit compartment are separated by a flame-retardant polyurethane foam plastic molded cover.
The functional unit compartment on the left is separated from the cable compartment on the right by steel plates.
Drawout electric control center and small current power distribution center (hereinafter referred to as drawout type)
The withdrawable MCC cabinet is divided into three compartments, namely the horizontal busbar compartment at the rear of the cabinet, the functional unit compartment on the left front of the cabinet, and the cable compartment on the right front of the cabinet. The horizontal busbar compartment and functional unit compartment are separated by functional boards made of flame-retardant foam plastic, and the cable compartment is separated from the horizontal busbar compartment and functional unit compartment by steel plates.
Portable motor control center and small current power distribution center (hereinafter referred to as portable)
The frame structure characteristics of the movable MCC are the same as those in 2.1 and 2.2.
The functional unit is designed as a movable structure, and the connection between the functional unit and the vertical busbar adopts a primary isolation contact. Even if the circuit connected to it is live, the functional unit can be completely removed and placed back from the equipment, and the other end is a fixed structure.
The functional units of portable MCC are divided into 8E/4, 8E/2, 8E, 16E, 24E, 32E, and 40E. The total height of the functional unit compartment is also 72E.
The horizontal busbar is installed in an independent busbar compartment behind the cabinet, with two optional installation positions, namely one-third or two-thirds of the cabinet height. The busbar can be installed on the upper or lower part as needed, or two sets of upper and lower buses can be installed simultaneously. The two sets of busbars can be used separately or in parallel. Each phase of the busbar is connected in parallel with 2 or 8 busbars, with a busbar cross-section of 10 × thirty-two × 2，10 × sixty × 2，10 × eighty × 2，10 × sixty × 4，10 × eighty × two × 2 and 10 × sixty × four × Two or six types.
Vertical busbar 50 × thirty × The "L" type copper busbar of 5 is embedded in a functional board made of flame-retardant plastic. The protection of live parts reaches IP20.
The neutral busbar (N line) and neutral protection busbar (PE line or PEN line) are installed parallel to the lower part of the functional unit compartment and vertically in the cable compartment. If insulators are used to separate the N line and PE line, they are used separately. If conductors are used to connect the two, they become PEN lines.