What are the height requirements for installing power distribution boxes?

Category: Industry News

Release time: 2022-03-03

Summary: 1. Determine the installation height of the distribution box. For concealed installation, the bottom of the box should be 1.4 meters above the ground; for exposed installation, it should be 1.2 meters above the ground. However, for exposed meter boxes, the height should be increased to 1.8 meters. The vertical deviation in the installation of the distribution box should not exceed 3 mm, and the operating handle should be at least 20 mm away from the side surface. 2. When installing a distribution box concealed within a 240-mm-thick wall, an 10-mm-thick asbestos board and a wire mesh with 2-mm-diameter holes spaced 10 mm apart must be installed behind the wall. Then, the area should be plastered with a 1:2 cement mortar to prevent cracking. 3. The secondary-side wires connecting metering instruments, current transformers, and other devices inside the distribution box shall have a cross-sectional area of no less than 2.5 mm².

1. Determine the installation height of the distribution box. For concealed installation, the bottom of the box should be 1.4 m above the ground; for exposed installation, it should be 1.2 m above the ground. However, for exposed meter boxes, the height should be increased to 1.8 m. The vertical deviation of the distribution box installation should not exceed 3 mm, and the operating handle should be at least 20 mm away from the side.
 
2. When installing a distribution box concealed within a 240mm-thick wall, an asbestos board 10mm thick and a wire mesh with 2mm-diameter wires and 10mm-sized openings must be installed behind the wall. Then, the surface should be smoothed with a 1:2 cement mortar to prevent cracking.
 
3. The secondary-side conductors connecting metering instruments, current transformers, and other devices inside the distribution box shall be copper-core insulated wires with a cross-sectional area of no less than 2.5 mm².

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