The process of earthing consists of connecting together all objects that may

People are usually constantly in contact with earth, thus if they touch a charged object whose potential is different from earth, the resulting potential difference across the person will result in an electric shock. In Europe it is referred to РІР‚ВearthРІР‚в„ў whilst in the USA it is called РІР‚ВgroundРІР‚в„ў. In fact, the whole of the planet may thus be considered as an infinite conductor which is at reference (zero) potential. However considering that the EarthРІР‚в„ўs mass is huge, it provides a large area for the flow of current, and thus resistance to current can be quite low with the result that the earth can be considered a good conductor. The Earth is a relatively poor conductor of electricity compared to conductors like copper or aluminum cables. Nonetheless it has an important electrical property, called conductivity (or low resistance) that forms an integral part of many modern day installations in industrial plants and utilities for a variety of reasons. This layer is usually associated with agricultural use or excavations for constructionР”Р‡oundations. The planet EarthРІР‚в„ўs top layer surface is covered with soil and rocks. Kyoritsu Electrical Instruments Works, LTD is not liable for any claims, damages or losses, including property damage or personal injury incurred on this practical guide. Kyoritsu Electrical Instruments Works, LTD informs that this guide is not a substitute for any International, National or Local Standard, which should always be consulted in case of doubt.

Specific procedures may vary with each task and must be performed by qualified people. The information given uses simple language for easy understanding by the users and it is intended to be an educational tool. This practical guide to earth / ground resistance testing contains procedures commonly practiced by electrical contractors, electricians and maintenance workers of power utilities.

Electrical earthing calculation