Jordningssätt

Jordningssätt refers to the methods used to connect electrical equipment to the earth, a process crucial for electrical safety. The primary purpose of grounding is to prevent electric shock by providing a low-resistance path for fault currents to flow to the ground instead of through a person.

There are several common jordningssätt. The most prevalent is the protective earth, often denoted by the symbol E or a ground symbol. In this system, exposed conductive parts of electrical equipment are connected to the main earthing terminal of the installation. This terminal is then connected to the earth electrode. If a live wire accidentally touches a metal casing, the fault current will flow to the earth through this protective conductor, tripping a circuit breaker or blowing a fuse, thus disconnecting the power supply.

Another system is the functional earth, sometimes called a system earth. This type of grounding is not primarily for safety but for the correct functioning of the electrical system or equipment. It might be used to reduce electromagnetic interference or to establish a reference potential.

The choice of jordningssätt depends on factors such as the type of electrical system, the equipment being used, and relevant electrical codes and regulations. Different countries and regions may have specific standards governing the implementation of these grounding methods. Proper installation and regular inspection of the jordningssätt are essential to ensure its effectiveness and maintain a safe electrical environment.