Electrical Safety Protection Measures for Water Park Equipment
The electrical safety measures for most water park equipment in China primarily involve circuit breaker service, grounding protection, leakage protection, and equipotential bonding. Each of these strategies has its own pros and cons. Comprehensive security protection can only be achieved when these measures are used in conjunction and complement one another.
1. Circuit Break Protection: This requires the use of air circuit breakers, fuses, and other equipment, which are mainly utilised for fault protection of lines and electrical equipment. If a fault occurs, such as a shell bumping, and the short-circuit current exceeds the fuse or trip current, the fuse and air circuit breaker will act to disconnect the faulty line, thereby safeguarding the line and electrical equipment.
2. Grounding can prevent personal electric shocks and protect the power system, protection lines, and electrical safety measures for water park equipment from damage. It is a fundamental measure to avert electrical fires, lightning strikes, and electrostatic damage. Grounding is generally categorised into two types: functional grounding and protective grounding.
3. Leakage Protectors are classified into three types: fine electrical action switch (only the protector of leakage protection), leakage action circuit breaker (with three function protectors of overload, short circuit, and leakage), and leakage relay (only leakage alarm) functional protector. The rated operating current of the leakage switch used to prevent personal electric shock should not exceed 15mA or 30mA; for line safety, it can be greater than 50mA, 70mA; and to prevent electric disasters, it is 500mA.
4. The function of equipotential bonding is to reduce the contact voltage of indirect contact with electric shock in the building and the potential difference of different metal parts, eliminating the hazard of dangerous fault voltage introduced from outside the building through electrical lines and various metal pipelines. It should connect the conductive parts of column F to each other through the total equipotential bonding terminal board (grounding busbar) near the incoming line distribution box.