1. Bending

所有的电线在敷设时，都讲究横平竖直，配电箱也一样。但是在配电箱接线中，虽然要求“直”，同时还要求不允许出现90°角。

All wires should be laid horizontally and vertically, and the same applies to distribution boxes. However, in the wiring of the distribution box, although it is required to be "straight", it is also required that no 90 ° angle is allowed.

这样做是因为，当电线的弯折角度大于90°后，就会对电线的绝缘层造成伤害——明显的就是绝缘层发白、变色。后果就是降低绝缘层的耐性，对绝缘性、 阻燃性都有较大影响。

This is because when the bending angle of the wire is greater than 90 °, it will cause damage to the insulation layer of the wire - the most obvious is the whitening and discoloration of the insulation layer. The consequence is to reduce the durability of the insulation layer, which has a significant impact on both insulation and flame retardancy.

标准的做法是，所有需要折弯的地方，都折成圆弧形的角，同时还要保证纵向电线与横向电线垂直。

The standard practice is to fold all areas that need to be bent into circular corners, while also ensuring that the longitudinal wires are perpendicular to the transverse wires.

2.交叉

2. Intersection

有两种情况会出现交叉，种是没有按照上文所说的，做到区分纵向的电线和横向电线，更不用说保证两者垂直了。当电线乱七八糟的排列在配电箱里，势必会造成电线较差。这样做的后果是配电箱内杂乱，一旦出现故障，维修起来会很麻烦。

There are two situations where there may be intersections. The first is that the distinction between longitudinal and transverse wires has not been made as mentioned earlier, let alone ensuring that the two are perpendicular. When the wires are arranged in a disorderly manner in the distribution box, it is bound to cause poor wiring. The consequence of doing so is that the distribution box is messy, and once a malfunction occurs, it can be very troublesome to repair.

另一种情况就比较严重了，是指横平竖直的进线与出线存在交叉。

Another situation is more serious, which refers to the intersection of horizontal and vertical incoming and outgoing lines.

在图中，主开关的出线从开关的左侧绕过，接到右侧断路器的上口。这样一来，势必会造成主开关的出线和主开关的进线交叉。这样做有两个后果：①主开关的进线会受到出线的压迫，导致进线接线不牢固；②在断开主开关对配电箱进行维修时，维修人员就有可能在维修主开关出线时接触到带电的进线，导致触电。

In the figure, the outgoing line of the main switch bypasses the left side of the switch and connects to the upper port of the right circuit breaker. In this way, it will inevitably cause the outgoing line of the main switch to cross with the incoming line of the main switch. There are two consequences of doing this: ① the incoming line of the main switch will be compressed by the outgoing line, resulting in unstable incoming wiring; ② When disconnecting the main switch for maintenance of the distribution box, maintenance personnel may come into contact with live incoming lines during the maintenance of the main switch outgoing line, resulting in electric shock.

3.跳线

3. Jumper

这个配电箱存在出线与进线交叉的情况，这属于上一节的内容，不再多说。我们单看主开关的出线——主开关后面有四个分开关，却只从主开关的出线接线柱引出了2根线（零火线各一根）。那它是怎么为后面四个分开关提供电源的呢？（零线直接接到了零排上，我们不再管它。）

This distribution box has a situation where the outgoing and incoming lines intersect, which belongs to the previous section and will not be further discussed. Let's just look at the outgoing lines of the main switch - there are four sub switches behind the main switch, but only two wires (one neutral wire and one live wire) are led out from the outgoing terminal of the main switch. How does it provide power for the following four sub switches? (The zero line is directly connected to the zero line, and we will no longer care about it.)

方法是将出线接到个分开关，再从个分开关的进线接线柱引出一条线，接到第二个分开关……这样一来，、二、三个分开管的上口接线柱，便都接了两根线。这种从前一个断路器上口取电源的方法，就叫做“跳线”。跳线的接法，早在2010年就被国标禁止，原因如下。

The method is to connect the outgoing line to the first sub switch, and then lead a line from the incoming terminal of the first sub switch to the second sub switch... In this way, the upper terminal of the first, second, and three separate pipes are all connected with two lines. This method of taking power from the previous circuit breaker is called "jumper". The connection of jumpers was prohibited by the national standard as early as 2010, for the following reasons.

跳线的危害

Hazards of Jumpers

箱内线，一般为4平方毫米或2.5平方毫米，4平方毫米的电线，大载流量为25A以上（数据来源于《GB/T 4706.1-2005》）。一个五孔插座的额定电流是10A，一个三孔插座的额定电流是16A，整个房间会有多少个插座？因此，25A的载流量很明显不够，是会引起电线过载的。

The internal wire of the box is generally 4 square millimeters or 2.5 square millimeters, with a maximum current carrying capacity of 25A or more for wires of 4 square millimeters (data sourced from GB/T 4706.1-2005). The rated current of a five hole socket is 10A, and the rated current of a three hole socket is 16A. How many sockets will there be in the entire room? Therefore, the current carrying capacity of 25A is clearly insufficient and can cause wire overload.

入户线一般为6平方毫米，大载流量为32A以上，能够满足家用（因此要求家庭总开关的额定电流不超过32A）。

The entrance line is generally 6 square millimeters, with a maximum current carrying capacity of 32A or above, which can meet the requirements of household use (therefore, the rated current of the home main switch should not exceed 32A).

那么，如果我把箱内电线换掉，也换成6平方毫米的行不行？答案是不行！电线太粗，势必会挤压箱内空间，影响散热。家用PZ30箱要求，电线不得超过4平方毫米。

So, if I replace the wires inside the box, can I also replace them with 6 square millimeters? The answer is no! If the wires are too thick, they will inevitably squeeze the space inside the box and affect heat dissipation. Household PZ30 boxes require that the wires should not exceed 4 square millimeters.

正确的接法为，每有一个支路断路器，就要从主开关下口引出一条线。

The correct connection method is to lead a line from the lower port of the main switch for each branch circuit breaker.

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