Fault Loop Impedance Calculator ~upd~ -

Zs ≤ 0.8 × Zs(max) (for UK BS 7671 rule of thumb) Draw a table like this:

(Add conversion for higher temps: multiply by 1.2 for operating temp) Draw this table (at rated tripping time, typically 0.4s for final circuits up to 32A): fault loop impedance calculator

| MCB type | 6A | 10A | 16A | 20A | 32A | 40A | |----------|------|------|------|------|------|------| | B | 7.7 | 4.6 | 2.9 | 2.3 | 1.44 | 1.15 | | C | 3.8 | 2.3 | 1.45 | 1.15 | 0.72 | 0.58 | | D | 1.9 | 1.15 | 0.72 | 0.58 | 0.36 | 0.29 | Zs ≤ 0