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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 · 第 2／6 頁

TN, TT and IT Earthing Systems

System earthing changes SPD selection and N-PE behavior.

In TN-S / TN-C-S, PE is solidly referenced. SPD connections to PE are straightforward, but you must still respect backup fuse / breaker coordination.

TT systems rely on earth electrodes with higher impedance. Follow manufacturer guidance for SPD topology and residual current device interactions.

IT systems may leave one point isolated or impedance-earthed. SPD selection needs special attention to avoid nuisance issues during first faults.

← What Counts as Low Voltage?

MDB, SDB and Final Circuits →

歡迎聯絡 Protec Power，諮詢 Type 1／Type 2 分級保護、產品選型，或成為東南亞與中東地區的本地備貨代理。

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