5.4.1 Power supply requirements applying to parts
of the IBS as a result of other IMO requirements should remain applicable.
5.4.2 The IBS should be supplied:
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.1 from the main and emergency sources of electrical
power with automated changeover through a local distribution board
with provision to preclude inadvertent shut-down;
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.2 from a transitional source of electrical power
for a duration of not less than 1 min; and
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.3 where required, parts of the IBS should also
be supplied from a reserve source of electrical power.