What are the detecting methods and techniques of grounding resistance?
Ground resistance tester1, ZC-8 type grounding resistance tester one2, auxiliary grounding rod two3, wires 5m, 20m, 40m each one
Use and operation1. Measure the wiring mode when measuring the grounding resistanceThe E terminals of 5m wire instrument, P terminals C terminals 20m line, 40m line, the other side of the wire are respectively connected with the measured grounding E's, P's current and potential probe probe C and E, P ',' C ',' should remain straight, the spacing 20m1.1 wiring diagram of measuring greater than or equal to 1 ohm grounding resistanceConnect the 2 E ends of the instrument together.
Ground resistance test requirements:A. AC work grounding, grounding resistance shall not be greater than 4 ohms;B. safety work grounding, grounding resistance shall not be greater than 4;C. DC work grounding, grounding resistance should be determined according to the specific requirements of the computer system;The earthing resistance of D. lightning protection ground shall not be greater than 10;E. if the combined grounding is used for the shielding system, the grounding resistance shall not be greater than 1.
