Earth Ground Testing

爱城一粒沙子

Earth Ground Testing
# e7 K: A6 t0 n: {1 `8 r2 M. M
/ i% U; U# q4 u* yMost facilities have grounded electrical systems, so that in the event of a lightning strike or utility over voltage, current will find a safe path to earth. A ground electrode provides the contact between the electrical system and the earth. To ensure a reliable connection to earth, electrical codes, engineering standards, and local standards often specify a minimum impedance for the ground electrode. The International Electrical Testing Association specifies ground electrode testing every three years for a system in good condition with average up-time requirements.

# {- m! q; D9 }: ]Understand earth/ground principles and safety in more depth and then describes the principle testing methods: 3 and 4 pole Fall-of-Potential testing, selective testing, stakeless testing and 2 pole testing.

吴京华

顶起技术贴！