How to check and measure the resistance of grounding rods and electrodes. Procedures

In this video we are going to see what a grounding system is, the parts that compose it and then we are going to focus on verifying and measuring the grounding resistance of the electrodes buried in the ground. We are going to see the three main methods used, such as the fall of potential method, the selective method and the method without auxiliary rods. We will see how to apply these methods with different measuring instruments.
NOTE 04-06-2021: At minute 2:39 there is a reference to the NEC, but the indication of 5 ohms in sensitive loads does not belong to the NEC 250.56 which only mentions 25 ohms. The 5 ohms would be a general recommendation not included in that article.

Видео How to check and measure the resistance of grounding rods and electrodes. Procedures канала SCIENTIA