The test items for grounding devices of electrical equipment and lightning protection facilities should include the following contents:
1.1 Electrical integrity testing of grounding grids 1.2 Grounding impedance 1.3 Measurement of surface potential gradient, contact potential difference, step voltage, and transfer potential in the field area
2. The electrical integrity test of the grounding grid should comply with the following regulations:
2.1 The electrical continuity between adjacent equipment grounding wires of the same grounding grid should be measured, expressed as DC resistance value
2.2 The DC resistance value should not exceed 0.05 Ω
3. The grounding impedance measurement should comply with the following regulations:
3.1 The grounding impedance value should comply with the design documents, and when there are no regulations in the design documents, it should comply with the requirements in the table below
3.2 The test method can be carried out in accordance with the relevant provisions of the current industry standard DL 475 (Guidelines for Measuring Characteristic Parameters of Grounding Devices), and the influence of overhead ground wires and cables connected to the grounding grid should be excluded during the test;
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