NEN 1010 §443/534
Surge Protective Device (SPD)
Overspanningsbeveiliging (SPD)
Also known as: SPD, surge protective device
Protects the installation against temporary voltage spikes from lightning strikes or switching operations. Type 1 (lightning current), Type 2 (voltage surge at distribution board), Type 3 (sensitive end equipment).
Practical example
Surge protection device (SPD): In a building with external lightning protection, a type-1 SPD is installed in the main distribution board, supplemented by a type-3 SPD near sensitive end equipment.
Common mistake
Surge protection device (SPD). Common mistake: Installing only a type-2 SPD in a building with an external lightning protection system — without a type-1, a direct strike may still damage the installation.
See also
Related terms
In-depth guides
- → §443 Surge Protection (SPD)
- → §433 Overload protection (§433) — the coordination rule Ib ≤ In ≤ Iz and I₂ ≤ 1.45 Iz
- → §559 Assimilation lighting — groups, RCD type and protection
- → NEN-EN-IEC 62305 Lightning protection for greenhouse complexes — risk
- → §434 Short-circuit protection & the adiabatic equation — §434
- → §536 Distribution boards & selectivity between protective devices
Available in: English, Nederlands, Polski, Русский, Українська