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What Zs isYou've already got both halves of Zs. Which two?
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Ze is the external earth fault loop impedance — the supplier’s part, back to the star point. Zs is the total: Ze plus your circuit’s line and CPC, out to the furthest point and back. Guidance Note 3 also calls it the total EFLI.
Guidance Note 3 · 2.6.15 · earth fault loop impedance
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