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correct answer : conduit should be used for each zone ranging from
≈23.2 m2 (250 ft2) to ≈55.7 m2 (600 ft2). This is based on ≈5.6 m2 (60 ft2) to ≈9.3 m2 (100 ft2) work areas and the diameter of the cable no larger than 6.3 mm (0.25 in). For larger zones ranging from ≈55.7 m2 (600 ft2) to ≈84 m2 (904 ft2), an ≈63 mm (2-1/2 trade size) conduit
In the ceiling zones method of ceiling distribution, the usable floor area should be divided
into zones of ≈23.2 m2 (250 ft2) to ≈92.9 m2 (1000 ft2) each
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