The functions of coiling the outgoing wires under the air switch of the distribution box

time：2025-03-16 Edit：switchgear view：28

The main functions of coiling the outgoing wires under the air switch of the distribution box are as follows:

Convenient Wiring and Subsequent Operations: In the quality and acceptance specifications of electrical construction,

it is required to reserve a certain length of wires in the distribution box and the switch bottom box. Coiling can neatly arrange

the excess wires and avoid damaging the wires due to direct folding and stuffing. Taking the common 86-type junction box as

an example, its size is 8.6cm×8.6cm, and according to the specification, the reserved length is half of the perimeter, that is,

about 17.2cm. Sometimes, there are multiple wires in one switch box. When the space is limited or the wires are too thick,

coiling can reduce the occupied space, make the wire layout more regular, and facilitate subsequent wiring operations. In addition,

after coiling the reserved wires, it is convenient to pull the wires out of the bottom box to connect the switch during wiring,

making the operation more convenient. When the wires or sockets are pulled by external forces, the flexible connection formed by

coiling can prevent directly pulling the wires connected to the switch, playing a protective role against external force damage.

If the reserved wires are too short, it will cause inconvenience in wiring, direct force on the switch connection points, and

difficulties in future maintenance. If the reserved wires are too long, the added coil is equivalent to an inductor, which is more

harmful in the ground wire. For example, when high-frequency current is generated by lightning, the inductor will instantly block

the current from passing through. Although the occurrence probability is low, there is still a risk.

Enhanced Electromagnetic Induction Monitoring (Theoretical Speculation, with Little Practical Impact): From the perspective of the

principle of electromagnetic induction, coiling the wires will form a certain inductance. In some special cases, when there is an

abnormal current change in the circuit, such as a rapid increase in current at the moment of a short circuit, the inductance generated

by coiling will hinder the current change, delay the sudden change of current, and give the air switch more time to respond, improving

the detection sensitivity to faults such as short circuits. However, in the actual low-voltage power distribution system, the air switch

itself already has a mature protection mechanism for short circuits and overloads. The role of enhanced electromagnetic induction

monitoring due to coiling is not obvious and is usually not the main consideration factor.