The parent row refers to the power supply system, the electrical cabinet in the total switch and the switch in the separation circuit of the connection copper row or aluminum row.

Sometimes called the bus row, is the power distribution equipment conductive material name, material flat copper (equivalent to wires), no insulation layer, the outside brush has a color paint that represents phase order, mainly used in indoor transformers to power distribution cabinets to power supply gates and then connected to the branches.

Female discharge heat shrink tube: pipe made of heat shrink material, when used when the suit is heated on the mother row of electrical equipment and contracted on the female row, acting as a safe protection or shortening the distance between phases of insulation.

Female heat shrink tube selection consideration one: determine the voltage level

The general female exhaust heat shrink tube has three voltage levels, 1KV, 10KV, 35KV. Different voltage level thickness is not the same, the price is not the same, so we choose the female heat shrink tube must choose the corresponding voltage level.

The female-drain edgy selection consideration two: to determine the size of the female row needs to be protected.

The size of the bus is absolute based on the current size used, and generally the size of the bus we choose is the regular size: 15 x 3, 20 x 3, 25 x 3, 30 x 4, 40 x 4, 40 x 5, 50 x 5, 50 x 6, 60 x 6, 60 x 8, 60 x 10, 80 x 6, 80 x 88, 80 x 10, 100000 :: 6,100 x 8,100 x 10,120 x 8,120 x 10,2 (60 x 6), 2 (60 x 8), 2 (60 x 10), 2 (80 x 6), 2 (80 x 8), 2 (80 x 10), 2 (80 x 10), 2 (10x6), 2 (100 x 8) 2 x 2 (100) 2 (100), 2 120 x 8), 2 (120 x 10)...

So when selecting, we according to the actual female row size, choose the corresponding female row heat shrink tube model can be. (For example, using a 20-3 bus, we can choose the female row of 20.) )

But if a special type of female row appears, we can not find the standard female discharge heat shrink tube corresponding to it, we can according to the formula D - L , W (D is the internal force of the mother row heat shrink tube, L is the width of the female row, W is the thickness of the female row).

Of course, there are many times, not so suitable model to you to choose, then in the choice, we should pay attention to:

1. If the selection of models too small female discharge heat shrink tube, the thickness of the heat shrink tube after use may be thin, not to achieve the effect of safe insulation, it may also be the female discharge heat shrink tube rupture.

2. If you select a female heat shrink tube that is too large, the heat shrink tube may shrink tightly after use, or the appearance of folds after contraction may be tight.

母排热缩管的选型注意

母排就是指供电系统中,电柜中总制开关与各分路电路中的开关的连接铜排或铝排.表面有做绝缘处理.主要作用是做导线用。

   有时也称母线排，是电力配电设备上的导电材料名称，材质扁铜（相当于电线），没有绝缘层，外面刷有表示相序的颜色油漆，主要用于室内变压器到配电柜再到电源总闸然后连接到各分闸。

   母排热缩管：用热收缩材料制造的管材，使用时套装在电气设备的母排上加热后收缩在母排上，起到安全防护或缩短相间距离的绝缘作用。

母排热缩管选型注意事项一：确定电压等级

   一般的母排热缩管有三个电压等级，1KV，10KV，35KV。不同的电压等级厚度不一样，价格也不一样，所以我们在选择母排热缩管的时候一定要选择对应的电压等级。

母排热缩管选型注意事项二：确定所需要保护母排的尺寸。

   母排的大小是根据所用电流大小绝对的，一般我们选择的母排尺寸为常规尺寸：15*3，20*3，25*3，30*4，40*4，40*5，50*5，50*6，60*6，60*8，60*10，80*6，80*8，80*10，100*6，100*8，100*10，120*8，120*10，2(60*6)，2（60*8）,2(60×10), 2(80×6) ,2(80×8), 2(80×10) ,2(100×6) ,2(100×8) 2(100×10), 2(120×8) ,2(120×10)…

所以选型的时候，我们根据实际母排尺寸，选择对应母排热缩管型号就可以。（比如使用的是20*3的母排，我们就可以选用Ф20的母排即可。）

   但是如果出现特殊型号的母排，我们无法找到标准的母排热缩管与之对应的时候，我们可以根据公式D=L+W(D是母排热缩管的内劲，L是母排的宽度，W是母排的厚度)。

   当然在也有很多时候，没有那么合适的型号给你选择，那么在选择的时候，我们要注意:

   1.  如果选择型号过小的母排热缩管，使用后的热缩管厚度可能会偏薄，达不到安全绝缘的效果，也有可能会是母排热缩管破裂。

   2.  如果选择型号过大的母排热缩管，使用后热缩管可能会出现收缩不紧，或者收缩后的外观褶皱。