Method for selecting the length of high-voltage grounding wire (simple and practical, universal for electricians)

1、 Remember the core principles first

Ground rod length=insulation safety distance corresponding to voltage level

Copper wire length=actual distance on site+reserved margin

2、 Select the standard length of the insulation rod (grounding rod) according to the voltage level

(Standard size according to national standards, direct comparison selection)

0.4kV low voltage: 0.5m~0.8m

10kV high voltage (): 1 meter, 1.2 meters

35kV：1.5 米

110kV：2.0 米

220kV: 2.5 meters to 3 meters

Function: Ensure a safe insulation distance between the human body and high voltage, prevent induced electricity and step voltage electric shock.

3、 How to choose the length of short-circuit copper wire (soft copper wire) for high-voltage grounding wire

1. Indoor distribution room/switchgear (10kV)

The cabinet is close, recommended:

Each 1m, 1.5m, 2m

Commonly used for the entire three-phase system: 3 × 1.5m+1.5m pole

2. Outdoor power lines, utility poles, and transformer stations

Large distance span, recommended:

Each 2m, 2.5m, 3m

3. Large equipment and long-distance busbars in substations

Selection: 3m to 4m per piece

Selection mnemonic

Actual measurement of distance between both ends+0.5-1m margin

Easy to operate, not tight, and does not pull or break wires.

4、 Copper wire thickness (wire diameter) matching selection

10kV/35kV routine maintenance: 25mm ² pure copper wire

Line and large capacity substation: 35mm ²

Low voltage temporary grounding: 16mm ²

5、 One click matching for different scenarios (providing customers with direct quotes)

10kV indoor distribution room

Grounding rod 1 meter+copper wire 3 × 1.5 meters+grounding 1.5 meters, 25 square meters

Electric pole/transformer outdoor 10kV

Grounding rod 1.2 meters+copper wire 3 × 2.5 meters+ground wire 2.5 meters

35kV line maintenance

Insulation rod 1.5 meters+copper wire 3 meters/piece