1. There must be a noticeable grounding mark at the maintenance ground.
2. The grounding device is connected to the metal reinforcing core, metal moisture barrier and armoring layer in the optical cable. The cross-sectional area of the grounding wire must be not less than 6mm ^ 2.
3. Withstand voltage level: The withstand voltage between the grounding device and the cabinet and frame is not less than 3000V (DC), no breakdown, no flashover for 1min.
4. Insulation resistance: The insulation resistance between the grounding device and the box's gold workpiece must be not less than 2? 10 ^ 4MΩ. The experimental voltage is 500V DC.
