(6)Where drum-clutches are provided, the following provisions shall have effect, namely:-(a)the operating gear of the clutch of the drum shall be provided with locking gear to prevent inadvertent withdrawal of the clutch;(b)every engine used for the lowering or raising of persons shall have suitable interlocking device so fitted that it is not possible -(i)to unclutch any drum unless the brakes of such drum are applied; or(ii)to release the brakes until the drum clutch is fully engaged and securely locked;(c)unless the cage or other means of conveyance attached to the drum is resting at the bottom of the shaft, the drum shall not be unclutched unless the winding engineman has assured himself immediately beforehand that the brake is fully applied.
