What are the potential safety hazards of coiling the outgoing wires under the air switch of the dist

time：2025-03-16 Edit：switchgear view：41

What are the potential safety hazards of coiling the outgoing wires under

the air switch of the distribution box?

Coiling the outgoing wires under the air switch of the distribution box has potential safety hazards in certain situations,

which pose threats to the operation of the electrical system, the safety of personnel, and the normal use of equipment:

Risk of Fire Caused by Heating: The coiled wires are equivalent to an inductor. When current passes through, a magnetic

field will be generated due to the magnetic effect of the current. The magnetic field causes energy loss in the surrounding

medium, that is, eddy currents are generated, which in turn cause the wires to heat up. If there are many turns or the

current is large, the heat will accumulate continuously, and the temperature of the wires will keep rising. Once the temperature

exceeds the tolerance limit of the wire insulation layer, the insulation layer will age and be damaged, and even a short circuit

will be triggered. The high temperature generated by the short circuit is extremely likely to cause a fire.

Affecting Fault Detection and Switch Operation: The air switch detects faults and executes the tripping operation according

to the magnitude of the current. The coiled outgoing wires will change the magnetic field distribution around the current

and interfere with the accurate sensing of the current by the internal detection components of the air switch. When an overload

or short circuit fault occurs, the air switch may not be able to detect the abnormal current in a timely and accurate manner,

resulting in delayed tripping or even failure to trip, making it impossible to control the fault in a timely manner, expanding

the scope of the accident, possibly damaging electrical equipment, and also increasing the risk of electric shock.

Accelerating the Aging of the Insulation Layer: After the wires are coiled, it is difficult for the heat to dissipate, and they are in

a relatively high-temperature environment. In this high-temperature environment for a long time, the insulation layer of the

wires will age faster, and its insulation performance will gradually decline. After the insulation layer ages, it is prone to damage,

cracking and other situations, exposing the conductors inside the wires, increasing the risks of electric shock and short circuit.

Increasing the Risk of Electric Leakage: Since the wires at the coiled part are close to each other, when the insulation layer is

aged or damaged, it is more likely for them to come into contact with each other. Once the wires with different potentials come

into contact, an electric leakage path will be formed, leading to an electric leakage accident. If the electric leakage is not discovered

and dealt with in a timely manner, when personnel come into contact with the electric leakage part, there will be a risk of electric shock.