Basic knowledge of electrical safety for ev charging stations

What is EV charger?

An EV charger, also called charging station, electric vehicle charging station, electric recharging point, charging point, charge point, electronic charging station (ECS), and electric vehicle supply equipment (EVSE), is a machine that supplies electric energy to charge plug-in electric vehicles—including cars, neighborhood electric vehicles, trucks, buses and others.

Today let's talk about the basic knowledge of electrical safety for ev charging stations.

I. The hazards of electric shock

1. Electric shock (electrocution): This refers to the passage of power through the interior of the body, affecting the normal function of the heart, lungs and nervous system. Electric shock can be divided into direct contact electric shock and indirect contact electric shock.  

2、Electrical injury (burn): is the electric current through the body can cause burns to the skin, muscles, or organs inside the body. Electrical injuries can be divided into the following types - electrical burns, electrical branding, mechanical injuries, and electro-optic eyes.

3, Fire and Explosion: Electric currents in abnormal or faulty conditions generate high temperatures, enough to ignite objects near the point of ignition, resulting in fire and explosion accidents. General causes of high temperatures include - electrical overload; damaged insulators, short circuits; inadequate maintenance of electrical appliances or wires; poor ventilation.

Basic measures to prevent electric shock during work on low-voltage equipment

1. Disconnect all aspects of the power supply from the equipment to be disconnected, including the neutral line, and remove the fusible fuse to hang a ‗no closing, someone is working' sign on the operating handle of the cutter or switch; if necessary, install a grounding wire on both sides of the cutter or switch or send someone to guard the site.   

2. Before work, a qualified test pen must be used to test the power to the outage equipment and surrounding equipment.   

3, work to prevent accidental touching, accidental touching of the adjacent live equipment and measures to prevent short-circuiting of live equipment.   

4、Take measures to prevent accidental entry into adjacent live intervals and accidental boarding on adjacent live poles and towers. 

5、Prohibit the use of shouting and appointment of time for stopping and delivering power. Arrange commanders and guardians according to the needs of the site.

6、Take other safety measures according to work needs and site conditions.

Three, the basic requirements of the charged operation

1. Electricity work should be carried out by experienced electricians. At least two people should work at the same time, with a special guardian for supervision.   

2、Working with electricity should be carried out with qualified insulating tools and on dry insulating materials.  

3, the work with electricity should be taken to prevent phase short circuit and three single-phase grounding insulation measures. Take measures to prevent accidental contact and accidental touching of the surrounding low-voltage live body.   

4, when working first divided into the fire line, zero line, choose a good working position. Disconnect the line, first disconnect the fire wire, then disconnect the ground; lap wire, the reverse order. The human body should not touch two wires at the same time.

Fourth, electrical safety appliances

Safety appliances can be divided into two kinds of basic insulation safety auxiliary insulation safety appliances. The basic insulation safety appliances is the degree of insulation enough to resist the operating voltage of electrical equipment and direct contact with the power supply safety appliances. Auxiliary insulated safety appliances refers to insulation strength is not enough to resist the operating voltage of electrical equipment, and does not directly contact the power supply safety appliances. Before using safety equipment, the appearance and function of the equipment should be verified, and auxiliary insulated safety equipment must be used when using basic insulated safety equipment.   

The following is a list of common safety appliances.

High-voltage basic safety equipment: insulating poles, insulating clamps, high-voltage testers (high-voltage test pens)   

Low-voltage basic safety equipment: insulated gloves, tools with insulated handles, low-voltage test pens    

High-voltage auxiliary insulation safety with: insulating boots, insulating gloves, insulating mats and insulating table

V. Storage methods for common safety equipment

Safety equipment should be stored in dry, ventilated places. Insulated ties should be hung or placed on a bracket and should not be in contact with the ground or wall to prevent moisture; insulated gloves should be stored in a closed cabinet and stored separately from other tools and instruments; high-voltage testers should be placed in a moisture-proof box and stored in a dry place. Insulated boots should be stored in a cupboard and should not be used in place of normal rain boots. All safety appliances shall not be used as general work.

Six, zero grounding protection

Direct grounding: the shell of electrical equipment grounding, its main purpose is to provide a low impedance path to the fault current in the case of leakage after grounding discharge. That is, when the electric shock, the current to ground flow away and avoid entering the human body to cause injury.  

Zero: the metal shell of the equipment and the protection of the zero line connection, when a phase directly connected to the metal shell of the equipment, that is, the formation of a single-phase short circuit, short-circuit current prompted the line on the short-circuit protection device quickly, within the specified time will be the fault equipment disconnected from the power supply to eliminate the risk of electric shock.

Supplier of EV DC Fast Charger

Luoyang Grasen Power Technology Co., Ltd is a professional high-tech enterprise engaged in the research, development, manufacturing, sales and services of new energy electric vehicle charging equipment and products. We are the supplier of a series of electric vehicle on-board charger series, DC/DC converter (DC/DC) series, DC charging power module series, AC charger series, DC fast charger series, etc. Many products have leading technology in China, widely applied in the fields of new energy electric vehicles all over the world.

If you want to know more details about our company and EV chargers, please feel free to contact us via email sales@grasen.com to make a great progress of your business.