**Standard size of distribution box**

Let's talk about the standard size of the **distribution box:**

1. When the distribution box is only for lighting distribution box or small power, when the incoming line is less than 10 square, if the number of switch is less than 20 ways, add up the switches width and add 20mm on each side to make the width of the distribution box. And the height is the height of the switch adds 40mm. The depth is the maximum depth of the switch adds 10mm.

2. When the distribution box is only for lighting distribution box or small power, when the incoming line is less than 10 square, if the number of switch is more than 20 ways, the distribution box needs to be arranged as two rows of switches at this time, add up the switches width and add 40mm on each side to make the width of the distribution box. And the height is the height of the switch adds 40mm. The depth is the maximum depth of the switch adds 10mm.

3. When the distribution box is only for lighting distribution box or small power, when the incoming line is less than 10 square, if the incoming switch needs a separate row, add up the switches width and add 20mm on each side to make the width of the distribution box. And the height of the box is the switch height adds the incoming line switch height and 40 mm. The depth is the maximum depth of the switch adds 10mm.

4. When the distribution box is a power distribution box or a power lighting distribution box, the algorithm is basically the same as the above. However, when the incoming line is larger than 10 squares, to take into account the bending radius of the incoming line sufficient space should be reserved for the primary terminal. When arranging switches in two rows, the wiring of the switches should be considered.