Earthing, also known as grounding, is an essential safety feature in electrical circuits. It provides a low impedance path for the current to flow in the event of a fault, which can prevent electrical shocks, fires, and damage to equipment.
The different types of earthing used in electrical circuits include:
Protective Earth (PE) - This is the most common type of earthing used in electrical circuits. It involves connecting the metal case of an electrical equipment to a grounding conductor or earth electrode. This type of earthing is designed to prevent electric shock and reduce the risk of electrical fires.
Signal Ground (SG) - This type of earthing is used in instrumentation circuits to provide a common reference point for signals. It is often connected to the metal case of an instrument to prevent noise and interference.
Instrument Earth (IE) - This is similar to protective earth, but is used specifically in instrumentation circuits. It involves connecting the metal case of an instrument to a grounding conductor or earth electrode to prevent electrical interference.
System Ground (SG) - This type of earthing is used to provide a common reference point for power systems. It involves connecting the neutral point of a power transformer to a grounding electrode.
Virtual Ground (VG) - This is not a true ground, but a circuit that mimics the behavior of a ground. It is often used in operational amplifiers to provide a reference point for signals.
The type of earthing used depends on the specific application and requirements of the circuit.
The above is given as a guideline only. earthing is a complex topic, especially within Hazardous areas where IS citcuits etc are employed. Jigsaw Controls are able to help you "unearth" the complexities of this, and more. Reach out to us today to learn more