(1) The bottom box must be vertical, and the bottom box in the same room must be installed on the same horizontal line.
(2) In the kitchen, bathroom and all places where ceramic tiles are pasted, the junction box should be flush with the wall, and a bottom box cannot be placed on two ceramic tiles.
2, switch socket bottom box installation rules:
(1) The bottom of the door switch box is 1.3m from the ground, and the door sleeve line at the side edge must be ≥70mm. The height difference between switches of the same model installed in parallel and the horizontal ground is ≤ 1mm, and switches in special positions (bedside switches, etc.). ) should be installed according to the requirements of the owner.
(2) switch, socket bottom box installation, opening surface and metope level off, firm, founder, wall tile can be slightly protruding.
(3) All switches and sockets should use special bottom boxes, and there should be no gaps around them. The cover plate must be correct and firm.
(4) Switches and sockets should be installed in inconspicuous places as far as possible, avoiding the modelling wall.
⑤ Switches and sockets should be installed in the center of ceramic tiles as far as possible, not on the waistline and ceramic tiles.
Section 1 Calculation and Selection of Conductor Cross-sectional Area 1, and lighting circuit generally adopts 1.5mm? Line and 2.5mm? line
3. The socket ring is generally 2.5mm? Line and 4.0mm? line
4. Central air conditioners and fast electric water heaters generally use 6.0mm? Line sum 10mm? line
5, the cross-sectional area of copper wire press type calculation:
Cross-sectional area = total power/voltage of electrical appliances (220v) ⅹ 5