Cable Protection Grounding Box
Designed for single-point bonding systems, this box contains a Sheath Voltage Limiter (SVL) to safeguard the cable sheath against transient overvoltages. It ensures absolute reliability for 10kV to 110kV electrical 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
Overview & Environmental Conditions
Scope of Use: Specifically designed to meet the technical requirements for 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
- Strip the insulation layer of the cable to make the exposed conductors the same length as the length of the terminal hole.
- Clean the objects inside the box.
- Remove the terminal blocks inside the box, press the cut grounding cable and the terminal block together, insert the terminal block into the inlet of the box, and fix it with screws.
- After fixing the first cable, insert the second cable, repeat the operation until all grounding cables are fixed.
- Fill rubber strips between the outlet pipe and the grounding place, fix the cable in the middle of the outlet pipe.
- Seal the outlet pipe with waterproof tape.
- Apply Heat-shrink tubing on the outlet pipe.
- Seal the two ends of the heat-shrink tubing with rubber insulation tape.
- Cover PVC tape on the waterproof tape, half-cover with two layers.
- Clean the objects inside the box again to ensure no debris remains.
- Install the sealing gasket and the box cover. Important: Do not tighten screws all at once. Tighten in three turns to prevent box cover deformation.
Selection Models
Standard thickness: 1.5mm. All include Heat shrinkable tape and waterproof composite tape.
| Model / Voltage | Dimensions (mm) |
|---|---|
| 10kV Protection Box 40*40mm Cu |
400*300*180 |
| 35kV Protection Box 40*40mm Cu |
400*300*180 |
| 66kV Protection Box 40*40mm Cu |
500*350*200 |
| 110kV Protection Box 40*40mm Cu |
500*350*200 |