鲜花( 30) 鸡蛋( 0)
|
Earth Ground Testing
! P7 W: H E. {7 O% d+ Z0 {6 W/ U; D
Most 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.3 O7 l8 E1 s3 z8 Q' u6 Q. j
. ?. r& d" q5 A- `! wUnderstand 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. |
|