Table 5.4 - Maximum earth-fault loop impedance for 240 V fixed
---------------- equipment distribution circuits protected by fuses
-
Maximum earth-fault loop impedance
Device rating
(A)
Cartridge
BS 88
Cartridge
BS 1361
Semi-enclosed
BS 3036
5
-
17.1
-
6
14.1
-
-
10
7.74
-
-
15
-
5.22
5.58
16
4.36
-
-
20
3.04
2.93
4.00
30
-
1.92
2.76
32
1.92
-
-
40
1.41
-
-
45
-
1.00
1.66
50
1.09
-
-

Extracted from The Electricians Guide Fifth Edition
by John Whitfield

Published by EPA Press
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