home > News > Industry News

How to prevent cable aging and short circuit from causing fire

source:Industry News     Popular:adapter     release time:2021-06-08 15:16:52     Article author:sznbone    

  Wires and cables are mainly insulated by the outer layer of sheath. They are corroded by outside air for a long time, and the insulation performance gradually decreases, gradually aging and hardening, becoming brittle or falling off. At this time, they can no longer play the role of insulation. The outer insulating layer of household electric wires is mostly made of plastic and rubber, and it will age and lose its insulating effect when used for a long time. The service life of general household wires can reach 10-20 years under normal conditions. After the wire is aging, the insulation performance decreases and short circuit is easy to occur. Especially in humid weather, although the appearance of the wire is intact, the insulation performance has been reduced. When moisture penetrates into the metal conductor, a short circuit occurs and a fire occurs. Short-circuit cables are also one of the main causes of fires. Every year, there are countless fire accidents caused by short-circuit cables worldwide. This is also one of the important "killers" that threaten public safety.

How to prevent cable aging and short circuit from causing fire(图1)

  1. Cable installation

  Cable laying and installation do not meet the standard requirements, the unit that undertakes the construction of the cable project does not perform the construction according to the specified requirements, the process equipment is poor, and the laying process is not strictly implemented. There is no supervision, self-inspection and mutual inspection during the installation process, not to mention the requirements of the fire protection law and electric power. The construction safety work regulations require construction, so that the completed cable line will be unsafe, have many accidents, and easily cause fires during operation.

  2. Short circuit

  A short circuit is when the two wires of the AC circuit touch each other, and the current does not pass through the electrical equipment in the circuit, but directly forms a loop. The resistance of the cable itself is relatively small. If it only passes through the loop of the cable, the current will increase sharply, which is tens or hundreds of times larger than normal. Because the higher the resistance, the more heat is generated, which will cause the wire to generate a temperature as high as thousands of degrees Celsius in a very short time, which is enough to ignite nearby combustibles and cause a fire.

  3. Line overload

  If the current through the cable exceeds its safe current carrying capacity, the cable will generate heat, and the more it exceeds, the greater the heat generation. When the heat causes the cable temperature to exceed 250°C, the cable rubber or plastic insulation layer will catch fire. If the cable "jacket" is damaged, it will cause a short circuit, and the risk of fire is even greater. In addition, if a substandard fuse is selected, the overload of the circuit cannot be detected in time, which can easily cause a fire.

  4. Cable aging

  Cable overload heating, sunlight (ultraviolet rays), environmental temperature variation, cable heat dissipation conditions, and the corrosion of the atmosphere and environmental chemicals will cause the cable insulation and outer sheath to age. The severe overload of the cable is the most important factor that accelerates the aging of the cable insulation. The main reason is that there is information that the long-term overload working temperature of the cable exceeds the allowable long-term working temperature of the insulation by 10°, and the insulation service life of the cable will be reduced by half. If it is not replaced in time, it is easy to cause a short circuit of the cable and cause a fire.


Read recommendations:

EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter

12-24W Medical Switching Power Supply

100-300W Charger,100W Charger,200W Charger,300W Charger

The application and function of the power adapter!power adapter Factory

How to design a good power adapter,CAR CHARGER wholesaler

Related Information

What are the conditions of use and maintenance methods for switching power supplies?

2022-05-21

Some Frequently Asked Questions about Power Adapters

2022-05-20

How to deal with the electromagnetic interference of switching power supply which is difficult in EM

2022-05-19

Six situations and solutions that cause the whistling of switching power supplies.power supply price

2022-05-18

Lightning Surge Test Method for Switching Power Adapters.adapter factory

2022-05-17

Two common power adapter output overload protection methods.ADAPTOR price

2022-05-16

Common fault maintenance skills of switching power supply

2022-05-14

How should we choose the charger?

2022-05-13

Power adapter expertise.CE ADAPTOR

2022-05-12

How to solve the high temperature rise of switching power supply transformer?

2022-05-11

The role of varistor in switching power supply

2022-05-10

Structural characteristics and working principle of varistor

2022-05-09

The role of varistor in switching power supply

2022-05-09

What are the main components of switching power supply

2022-05-07

Two ways for MOS devices to dissipate in high-power power supplies,CE ADAPTOR Processing

2022-05-06

Several common insulation protection technologies for power adapters

2022-05-05

What are the unique advantages of high frequency switching power adapter

2022-04-27

What are the main components of switching power supply.China cnc plastic cutting

2022-04-26

Troubleshooting method of switching power supply,CE ADAPTOR wholesale

2022-04-25

How to use the power adapter correctly

2022-04-23

What is the comparison between a charger and an adapter?

2022-04-23

The optimal solution of drone power management solution!

2022-04-22

Several common insulation protection technologies for power adapters

2022-04-21

What are the unique advantages of high frequency switching power adapter

2022-04-20

General Mechanism Analysis of Switching Power Adapter.ac power adapter wholesaler

2022-04-19

Suppression method of low frequency ripple of switching power supply

2022-04-16

Why is the power adapter making noise?

2022-04-15

When the power adapter is in normal use, what is the normal temperature?

2022-04-14

90% of people use the car charger incorrectly, are you using it right?CAR POWER SUPPLY sales

2022-04-13

The difference between a power adapter and a voltage regulator

2022-04-12

Popular recommended products

24V1.5A 36W Switching Power Supply

2020-08-29

24W USB Charger,24W Charger,USB Charger

2020-08-27

12W 2USB Charger,2USB Charger,12W Charger,USB Charger

2020-08-27

12W CAR CHARGER,12W USB CAR CHARGER,CAR CHARGER,12W CHARGER

2020-08-27

24-36W Charger,36W Charger,24W Charger,30W Charger

2020-08-27

12-24W Medical Switching Power Supply

2020-08-27

40W 4USB Charger,40W Charger,4USB Charger

2020-08-27

19V2A 36W Switching Power Supply

2020-08-28

500W Charger,Charger

2020-08-28

36-90W Charger,36W Charger,90W Charger,40W Charger,50W Charger

2020-08-27

24-65W Medical Switching Power Supply

2020-08-27

MKS-1401700H Switching Power Supply

2020-08-29

Transformer,Power Transformer,Ring Power Transformer

2020-08-27

24V21A LED Power Supply 24V Power Supply 21A Power Supply

2020-08-27

EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter

2020-08-28

60W 6USB Charger,60W Charger,6USB Charger,Charger

2020-08-27

12V2ASwitching Power Supply

2020-08-28

ER42 High Frequency Transformer

2020-08-27

10-24W Charger,24W Charger,10W Charger

2020-08-27

12-36W POE POWER SUPPLY

2020-08-27

MK-C1806028 MKA ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter

2020-08-28

EI-66 ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter

2020-08-28

MKS-120200BS-36 Switching Power Supply

2020-08-29

18-25W Switching Power Supply

2020-08-28

200-500W Switching Power Supply

2020-08-29

24W 2USB Charger,24W Charger ,2USB Charger

2020-08-27

EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter

2020-08-28

24-65W Switching Power Supply

2020-08-29

30-500W LED Power Supply 30-500W Power Supply

2020-08-27

36-65W Switching Power Supply

2020-08-29
Copyright 2020 © Merryking Technology Co., Ltd. All rights reserved