6.5.1 In view of exceptional conditions
in which the explosion hazard may extend outside the above-mentioned
zones, special arrangements should be provided to facilitate the selective
disconnexion or shut-down of:
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.1 ventilation systems;
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.2 non-essential electrical equipment;
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.3 essential electrical equipment;
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.4 emergency equipment except battery supplied
lighting and radio;
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.5 generator prime movers.
6.5.2 Electrical shut-down systems that are provided
to comply with 6.5.1 should be designed so that the risk of unintentional
stoppages caused by malfunction in a shut-down system and the risk
of inadvertent operation of a shut-down are minimized.