Learning path

Knowledge Hub

From lightning concepts to low-voltage power-line SPD products—a structured guide for engineers, panel builders, and local partners.

4. Earthing & Bonding for Protection · Page 4 of 6

The SPD-to-Earth Path

The most overlooked detail in failed surge protection jobs.

Keep it short and straight

Every extra meter of PE conductor adds inductance. Under a fast surge, that inductance creates voltage that appears at the protected bus—even if the SPD clamps perfectly at its terminals.

Avoid coils and loops

Do not spiral spare cable. Cut to length. Route phase/neutral/PE leads of the SPD close together to minimize loop area.

Target practice

Many guides aim for total SPD connection length well under 0.5 m per lead where physically possible.

← Earth Electrodes and Rings

External LPS Meets Internal SPDs →

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