The junction box may be more familiar to the electrician, it is used to protect the wires and connect the wires, generally PVC and white iron box material. The domestic junction box is mainly 86 type. In home decoration, the junction box is one of the electrical accessories, because the wire used for decoration is through the wire pipe, and in the joint part of the wire (such as the line is relatively long, or the wire pipe to be cornered) is used as a transition, the wire pipe is connected with the junction box, and the wire in the wire pipe is connected in the junction box to protect the wire and connect the wire. You need to calculate before using the junction box, so how to calculate the number of junction boxes?
The engineering quantity of the junction box is calculated according to the number of statistics, and the specific algorithm is:
1. According to the statistics of the construction plan, calculate the number of switch boxes = the number of switches + the number of sockets.
2. Calculate the number of junction boxes for lamp heads (lamps) according to the construction plan statistics (only 1 junction box for a set of fluorescent lamps).
3. The calculation of the junction box is: where the pipeline has a three-way branch and a four-way sub-control pipe, each place is calculated 1; according to the specification, when the straight pipe has no bend more than 30M, when one bend exceeds 20M, when the two bends exceed 15M, and when the three bends exceed 8M, the junction box must be added for calculation.