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

3. Low-Voltage Power System Basics · Page 1 of 6

What Counts as Low Voltage?

LV definitions and where power-line SPDs typically apply.

Typical LV range

In IEC practice, low voltage generally covers up to 1000 V AC / 1500 V DC. Building distribution at 230/400 V AC is the most common SPD application.

Where SPDs sit

Power-line SPDs are installed at main distribution boards (MDB), sub-distribution boards (SDB), and near critical loads—always with correct backup protection and short leads.

DC systems

PV strings, battery energy storage, and DC busways need DC-rated SPDs. Do not apply AC-only devices on DC circuits.

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