Isolation transformers serve the galvanic isolation in electrical systems by isolating the circuits supply and and secondary side. In single phase electrical wiring, there are three wires hot, neutral, and ground. When there are numerous physically separated devices are connected in the same circuit they may use a similar power line.
In general, the sizing of earthing conductors is based on the following principles, we will discuss earthing cable size as per IEC 60364-5-54
IEC standard for instrument earthing, also referred to as grounding, play a crucial role in ensuring the safety, reliability, and performance of electrical and electronic systems. To achieve these objectives, compliance with the International Electrotechnical Commission or IEC standard for instrument earthing is of utmost importance.