(1) An employer shall ensure that a guard is provided and kept in position at every abrasive wheel in motion, unless the use of a guard would be impracticable due to the nature of -
(a) the work being done at the wheel,
(b) the work ordinarily done or intended to be done at the wheel, or
(c) the wheel itself.
(2) An employer shall ensure that every guard provided under paragraph (1) -
(a) in so far as is reasonably practicable, is of such a design and construction so as to contain every part of the abrasive wheel in the event of a fracture of the wheel, or of any part of the wheel, while that wheel is in motion,
(b) is properly maintained and secured so as to prevent the displacement of the guard in the event of any such fracture, and
(c) encloses the whole of the abrasive wheel except where a part of the wheel is necessarily exposed -
(i) for any work being done at the wheel, or
(ii) for work which is ordinarily done, or ordinarily intended to be done, at the wheel where a non adjusta
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