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Direct Grounding Link Box
High Voltage Grounding

Direct Grounding Link Box

Provides a solid, direct electrical connection between the high voltage cable sheath and the substation earth network. Typically installed at the earthed end of a single-point bonded system to ensure maximum safety and reliability for 10kV to 110kV networks.

  • Material: Premium 304 Stainless Steel
  • Voltage Range: 10kV, 35kV, 66kV, 110kV
  • Protection Level: IP55, IP56, IP66, IP68
  • Standards: GB11032-2000, IEC6009-4, DL/T401-2002
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Overview & Environmental Conditions

Scope of Use: Suitable for the design, manufacture, and use of cable sheath protection grounding boxes, direct grounding boxes, cross-interconnection boxes, and sheath insulation monitoring boxes. These units are designed as three-phase common bodies (please specify if single-phase is required).

  • System Rated Voltage: Up to 110kV (10kV standard baseline)
  • Cable Nominal Cross-section: 25 - 800mm²
  • Rated Frequency: 50Hz / 60Hz
  • Temperature Range: -22°C to 40°C
  • Altitude: Below 3000m (Please specify if operation is above 3000m)
  • Installation Methods: Wall-mounted, buried, bracket-mounted, floor-standing, concealed (embedded).

Factory Testing & Performance

DC Withstand Voltage

5.5kV, 1 min (No flashover/breakdown)

Short-time Withstand Current

20 kA (Main Circuit)

Peak Withstand Current

50 kA (Main Circuit)

Lightning Impulse

185 kV

* Mechanical stress test verified: No cracks on the shell, no damage affecting electrical performance.

Installation Process

  1. Strip the insulation layer of the cable to make the exposed conductors the same length as the length of the terminal hole.
  2. Clean the objects inside the box.
  3. Remove the terminal blocks inside the box, then press the cut grounding cable and the terminal block together, and then insert the terminal block into the inlet of the box, and fix it with screws.
  4. After fixing the first cable, insert the second cable, repeat the operation until all grounding cables are fixed.
  5. Fill rubber strips between the outlet pipe and the grounding place, fix the cable in the middle of the outlet pipe.
  6. Seal the outlet pipe with waterproof tape.
  7. Apply Heat-shrink tubing on the outlet pipe.
  8. Seal the two ends of the heat-shrink tubing with rubber insulation tape.
  9. Cover PVC tape on the waterproof tape, half-cover with two layers.
  10. Clean the objects inside the box again to ensure no debris remains.
  11. Install the sealing gasket and the box cover. Important: Do not tighten screws all at once. Tighten in three turns in three layers. Otherwise, it will cause the box cover to deform.

Selection Models

Standard thickness: 1.5mm. All include Heat shrinkable tape and waterproof composite tape.

Model / Voltage Dimensions (mm)
10kV Direct Grounding Box
40*40mm Cu		 400*300*180
35kV Direct Grounding Box
40*40mm Cu		 400*300*180
66kV Direct Grounding Box
40*40mm Cu		 500*350*200
110kV Direct Grounding Box
40*40mm Cu		 500*350*200
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