Electrical equipment will not endanger human health and surrounding equipment during normal operation and under expected abnormal conditions. When electrical equipment fails unexpectedly, it should be able to cut off the power supply and limit the accident within the allowable range. If electrical equipment is improperly installed, used unreasonably, and repaired untimely, especially if the electrical staff lacks the necessary electrical safety knowledge, it will not only cause waste of electrical energy, but also cause electrical accidents, endangering personal safety, and bringing great harm to the company and employees. loss.
1. What are the safety requirements for workshop electrical equipment?
The electrical equipment used in the workshop must meet the following safety requirements:
(1) The structural form of the equipment should be adapted to the site environment;
(2) The exposed charged body on the equipment should be protected;
(3) The switchgear, protection device, control device and signal device installed on the equipment must be complete and intact;
(4) The phase-to-phase insulation resistance and ground insulation resistance of the equipment must meet the requirements;
(5) All uncharged metal casings should be grounded or connected to zero according to the characteristics of their power supply system;
(6) Carry out maintenance and safety inspections regularly.
2. What conditions must electrical workers meet?
Electrical workers must meet the following conditions: (1) have no diseases that hinder work as identified by doctors; Pass the examination; (3) Learn the emergency first aid method, first learn the electric shock rescue method and artificial respiration method.
3. What safety equipment should be used for electrical work?
The safety appliances used in electrical work generally include: (1) insulating safety appliances; (2) safety appliances for climbing work; (3) portable voltage and current indicators; (4) temporary grounding wires, etc. Electrical safety appliances should be inspected and tested regularly in accordance with the provisions of the “Electrical Industry Safety Work Regulations”.
4. What are the main causes of common electric shock accidents?
(1) The human body directly contacts the electrified body; (2) The human body contacts the malfunctioning electrical equipment;
(3) The distance from the electrified body is less than the safe distance; (4) Electric shock caused by step voltage
(If a person or livestock stands within 8 to 10 meters from the landing point of the energized wire, an electric shock accident may occur. This kind of electric shock is called a step voltage electric shock).
5. What are the main methods to prevent electric shock?
(1) Limit voltage or power supply energy. Including the use of safe ultra-low voltage, safe power supply, and safe circuit structure;
(2) Increase the insulation distance. Including the use of insulating live parts, isolation covers or covers, and leakage protection devices;
(3) Grounding. In different power grid systems, different grounding methods are used for electrical equipment enclosures.
6. What are the basic requirements for safe use of electricity?
(1) Insulation; (2) Safe distance; (3) Safe ampacity; (4) Safety signs.
7. What are the common electrification (static) phenomena in production?
(1) Friction electrification; (2) Peeling electrification; (3) Flow electrification; (4) Spray electrification; (5) Impact electrification; (6) Burst electrification; (7) Droplet electrification (8) Drop electrification; ( 9) Induction electrification.
8. What are the three forms of electrostatic discharge?
There are three forms of electrostatic discharge: corona, brush, and spark discharge. Among them, the spark discharge energy is released quickly and concentrated, and the risk of ignition is relatively high.
Post time: Apr-28-2023