45 seconds when power is automatically restored after a black-out, including those supplied from main distribution systems. (These consumers may be supplied from main switchboards or sub distribution boards).6) Load shedding/ trip is arranged to prevent overload of these generator sets.7) Transitional source of power is installed when required in 201.8) The location of each of the spaces referred to in this paragraph is such that one of these generator sets remains operable and readily accessible in the final condition of damage. Further, the boundaries shall meet the provisions of I102, except that contiguous boundaries shall consist of an A-60 bulkhead and a cofferdam or a steel bulkhead insulated to class A-60 on both sides.9) Bus tie breakers between the spaces have short circuit protection providing discrimination.10) The arrangements of these generating sets comply with the requirements given in:— 105 c), i.e. bus-tie breakers shall open automatically upon blackout— 105 h)— 301— 303 (see guidance note).Guidance note 1:The second source of energy for starting may be located outside the machinery space. In case of a fire or other casualty in any one space a total of at least two sources of starting energy for the remaining generator(s) have to be available.
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