Total distribution box
If it is an independent transformer, the transformer and the total distribution box behind it are installed by the power supply bureau. The total distribution box contains the total low-voltage circuit breaker and active and reactive energy meter, voltmeter, ammeter, voltage conversion switch and indicator light. The wiring of each branch line of the construction site shall be connected to the branch distribution box behind the main distribution box. If it is a transformer on the pole, the two distribution boxes are installed on the pole. The plane under the box is 1.3m above the ground. If it is a large transformer, it can be placed on the platform and can be separated by a closed distribution cabinet. The DZ series low-voltage circuit breaker is used in the distribution box. The total circuit breaker is selected according to the current of the transformer. Each branch line is controlled by a circuit breaker with a smaller capacity. The capacity of the circuit breaker is selected according to the maximum rated current of the circuit. If the current is small, it should be Select the leakage switch (the maximum leakage capacity of the leakage switch is 200A). The number of sub-breakers should be one or two more than the number of design branches, as an alternate branch. The distribution power box of the construction site is not equipped with current and voltage meters for monitoring.
If it is not an independent transformer, but the original transformer is used, the total distribution box and the branch distribution box are integrated, and the power and reactive energy meters are added. Starting from the main distribution box, the rear line adopts TN-S three-phase five-wire system, and the metal shell of the distribution box is to be connected to zero.
Fixed distribution box
Since the construction site is laid with multi-use cable lines for direct burial, the power supply system is radial, and each fixed distribution box is the end point of this branch, so it is generally placed near the electrical equipment of this branch.
The fixed distribution electric box shell is made of thin steel plate, the top is rainproof, the height of the box body is more than 0.6m from the ground, the leg is supported by angle steel, the box is opened on both sides, and the inside of the box is made of insulating board for electrical installation. Only 200~250A main switch, with four-pole leakage switch, the capacity is the maximum rated current of the box electrical appliance. Considering the versatility, it can be designed according to the basic conditions of various equipments used on the construction site. For example, consider that each box can be connected to the tower crane or Electric welder. The main switch is equipped with several shunt switches, and also uses a four-pole leakage switch. The capacity is combined according to the size of common electrical specifications. For example, the main switch uses a 200A leakage switch, which has four branches, two 60A, and two 40A. The porcelain plug-in fuse should be installed as the obvious disconnection point at the lower end of the shunt switch, and as the equipment terminal, the upper port of the fuse is connected to the lower port of the leakage switch, and the lower port is empty to prepare the device for wiring. If necessary, a single-phase switch should be installed in the box to prepare for single-phase equipment.
As the end point of the branch line, in order to enhance the reliability of protecting the neutral line grounding. Repeat grounding at each fixed distribution box.
After the wire is introduced into the box, the working neutral line is connected by the terminal block. The phase line is directly connected to the upper leakage switch. The protection zero line is crimped onto the grounding bolt on the distribution box housing and repeated grounding. After the distribution box The protection zero line is all connected to this bolt.
Mobile distribution box
The mobile distribution box format is the same as that of the fixed distribution box. It is connected to the fixed distribution box with a rubber sheathed flexible cable and moved as close as possible to the electrical equipment, such as from the downstairs to the upper floor construction layer. The leakage switch is also used in the box. The capacity is smaller than the fixed box. A single-phase switch and socket should be installed to provide a single-phase power supply for single-phase electrical appliances. The metal housing of the distribution box should be connected to zero protection.
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