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The high pressure protection properties of optical fiber boxes

Earthing device structures:

1 protective earth must have obvious signs of grounding.

2 grounding device cable metal reinforced core and metal and moisture layer, armored layer connected to grounded cross-sectional area must be no less than 6mm^2.

Withstand voltage level: grounding resistance with the boxes and racks voltage is below 3000V (DC), 1min not penetrate and no flying arc.

Insulation resistance: grounding with box gold artifacts of the insulation resistance must not be less than 2x10^4M ω, test voltage is 500V DC.