(1) Subject to paragraph (12), an employer shall ensure that -
(a) the part of the saw blade of a circular sawing machine which is below the machine table is securely fenced,
(b) every circular sawing machine is provided with a riving knife which -
(i) is securely fixed by means of a suitable device situated below the machine table,
(ii) is behind and in a direct line with, the saw blade, and
(iii) fulfils the conditions set out in subparagraph (c),
(c) in relation to the riving knife referred to in subparagraph (b) -
(i) it has a smooth surface, is strong, rigid and easily adjustable,
(ii) the edge of the knife nearer the saw blade forms an arc of a circle having a radius not exceeding the radius of the largest saw blade with which the saw bench is designed to be used,
(iii) it is capable of being adjusted, and is kept adjusted, so that-
(I) it is as close as practicable to the saw blade, having regard to the nature of the work being done, and
(II) at the level of the machine table th
…