Table 5.1 - Maximum earth-fault loop impedance for 240 V socket outlet circuits protected by fuses
Fuse rating (A)
Maximum earth-fault loop impedance (Ohms)
-
Cartridge
BS 88
Cartridge BS 1361
Semi-enclosed BS3036
5
-
10.9
10.0
6
8.89
-
-
10
5.33
-
-
15
-
3.43
2.67
20
1.85
1.78
1.85
30
-
1.20
1.14
32
1.09
-
-
40
0.86
-
-
45
-
0.60
0.62

Extracted from The Electricians Guide Fifth Edition
by John Whitfield

Published by EPA Press
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