Basic installation specification for low voltage d

2022-05-18
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Low voltage power distribution basic installation procedures

Abstract: in combination with the actual situation of the enterprise, practical low voltage power distribution basic installation procedures are compiled to achieve practical specifications. Why do we use different pulling forces for installation

key words: installation regulations of low voltage power distribution basic regulations of low voltage power distribution installation I. requirements of low voltage power distribution room 1) the door shall be opened outward and the door shall be equipped with rat proof board; 2) There are daylighting windows and ventilation shutters, which should be rainproof. Generally speaking, the gap of trapezoidal lead screw is relatively large, and snow and small animals enter the room; 3) There shall be slope and sump at the bottom of cable trench; 4) The cable trench without reel shall be provided with trench cover plate; 5) The channel in front of the panel is more than 1.3m, and the channel behind the panel is more than 0.8m, and there are safety barriers; 6) The ground elevation of the distribution room on the first floor shall be more than 0.5m. 2、 Installation of distribution board 1) the distribution board shall be a standard board with a cover on the top and a door in front; 2) The exterior color of the switchboard shall be consistent and the surface shall be free of scratches; 3) The busbar of distribution board shall be provided with color code; 4) The distribution board shall be installed vertically, and the perpendicularity deviation shall be less than 5; 5) When opening or closing the cabinet door, the panel body shall be free from shaking; 6) The ammeter and voltmeter on the distribution board shall be installed as required; 7) The outgoing circuit on the distribution board shall be marked; 8) The primary bus of the distribution board shall be connected with copper bars as far as possible, with gaskets on both sides of the crimping screws and spring gaskets on the nut side. If multiple strands of plastic copper wires are used for connection, the copper nose shall be crimped; 9) The secondary control line of the distribution board shall be centrally wired and wrapped and fixed with plastic tape and bandage. The spare core of the control cable shall be spirally wound at the branch of the control cable; 10) The transformer, motor protector and other small parts of the distribution board shall also be firmly fixed. 3、 Installation of cables 1) for the installation of cable trench, first check whether the direction, width, depth, turn and embedded pipes at each crossing meet the design requirements; 2) After the cable enters the trench, it is not necessary to strictly straighten it, and it should be relaxed into a wave shape; 3) The length allowance for maintenance shall be reserved at both ends of the cable; 4) The distance between cable fixing brackets or fixing points shall not be greater than 1m; 5) When the cable is laid through the pipe, the inner diameter of the pipe shall not be less than 1.5 times of the outer diameter of the cable, and shall not be less than 100mm; 6) When the cable is laid underground or through the wall or floor, it shall pass through the pipe or take other protective measures; 7) The gap between China's instrument technology and foreign advanced technology continues to be shortened from underground or electricity. When the cable trench leads out of the ground, the section 2 meters above the ground shall be protected by metal pipe or cover; 8) The depth of directly buried cable is 0.7m. The cable shall be covered with 100mm thick soft soil or sand, covered with concrete for protection, and buried with cable marker pile

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