Technical data
116
Power cable sizes and fuses
Cable dimensioning for rated currents (I
1N
) is shown in the table below together with
the corresponding fuse types for short-circuit protection of the input power cable.
The rated fuse currents given in the table are the maxima for the mentioned
fuse types. If smaller fuse ratings are used, check that the fuse rms current
rating is larger than the rated I
1N
current given in the rating table on page 113.
If 150% output power is needed, multiply current I
1N
by 1.5. See also section
Selecting the power cables on page 26.
Check that the operating time of the fuse is below 0.5 seconds. The operating
time depends on the fuse type, the supply network impedance as well as the cross-
sectional area, material and length of the supply cable. In case the 0.5 seconds
operating time is exceeded with the gG or T fuses, ultra rapid (aR) fuses will in most
cases reduce the operating time to an acceptable level.
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