June 13, 2023
"Swinging on a swing in air, touching high-voltage lines with your hands, arcing in front of your eyes and setting off firecrackers in your ears." This is scene that every worker on line must go through.
Live work is a method of repairing and testing high-voltage electrical equipment without power outages. Working on live jobs is very dangerous.
An electrician in Chaozhou was electrocuted while climbing a high-voltage pylon to work, and died when he was demolished by firefighters;
Once in Jiangsu Guofeng Electric Power Engineering Co., Ltd. an electrical accident has occurred. The workers were electrocuted and caught fire. They instantly burned down, one died, other was wounded.
How to avoid electric shock? For safety of their own lives, electricians should keep following points in mind when working with live electricity.
Single, no loop
The basis of electric shock is circuit formed by human body and circuit, so as long as circuit does not occur, electric shock can be completely excluded.
There are three types of circuits that can be formed during live operation—
1. The hand touching wire and feet standing on ground form a loop between wire, hand, human body, feet and ground, causing electric shock.
To avoid this, unplug legs from ground. For example, stepping on a bench, wearing insulating rubber shoes, etc. means separating feet from ground with an insulator. Of course, during this process, it is also necessary to ensure that other parts of body do not come into contact with ground or wall.
2. Both hands receive an electric shock, forming a loop of live wire, right hand, left hand and neutral wire. To avoid this situation, you need to pay attention to during construction and avoid touching neutral wire with both hands at same time.
When both hands touch a live wire at same time, if distance between hands exceeds 1 meter, a potential difference will be generated between two hands, which will still cause electric shock.
3. Electric shock when connected to a circuit - two points mentioned above are based on assumption that there is no load in circuit, that is, neutral wire and live wire are not connected. If neutral wire is connected to live wire, even if you wear insulating rubber shoes and touch conductor with one hand, since there is current in circuit at that time, human body will be connected as a resistance, resulting in electric shock. When faced with such a situation, you can only pull off insulation layer of wire, and first remove wire from top of circuit breaker.
Second, disassembly sequence
Special attention is also paid to disassembly and assembly of live wires. When removing wires, first remove live wire, and then remove neutral wire; When installing, install neutral wire first, and then install live wire. The purpose of this is to shorten lifetime of circuit and reduce the risk of electric shock.
3. Insulation equipment
Before you go live, put on as much isolation equipment as possible. Insulating caps, protective goggles, insulating clothing, insulating gloves, protective gloves, insulating pants, insulating rubber shoes, etc. In hot summer, you shouldn't try to be cool and light without wearing or wearing less insulating gear.
In addition, professional power tools such as screwdrivers must also have insulated handles.
Fourthly, equipment operation confirmation
Before working live, measure work object and record all live objects. Charged objects must be treated with care and psychologically prepared in advance.
5. Download Requirements
If there is a load in circuit, there will definitely be a current, and if there is a current, then an arc will be generated when wire is disassembled, and greater current, greater arc.
So it's better to be able to shut down all loads before running job. If not, also try to minimize load on circuit.
Electrical equipment requires frequent testing, inspection and maintenance over a long service life, so working under voltage is inevitable. Especially during peak period of electricity consumption in summer, electricians need to check electrical equipment so that no one can use electricity normally.
Although we are kind to electricians, we also hope that electricians should pay attention to safety when working with live electricity, act in accordance with rules and should not be careless, otherwise it will leave endless pain in family.