8.3.1 When general lighting within a vessel is
provided by a centralised electrical system, an alternative source
of lighting (which may be a suitable portable battery operated lamp(s)
if practical, taking into consideration the size and complexity of
the vessel) should be provided. This alternative source of lighting
should be sufficient to:-
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.1 enable persons to make their way to the open
deck;
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.2 illuminate survival craft launching and embarkation;
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.3 illuminate man-overboard rescue equipment and
rescue areas;
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.4 permit work on essential machinery.