786. Control of cardox and hydrox shells at coal mines.

786.     Control of cardox and hydrox shells at coal mines.

The maintenance, preparation for use and use of the blasting materials and devices known as cardox shells and hydrox shells1 at coal mines is governed by regulations2.

Such shells must not be filled or primed with an initiator on the surface except at a place appointed by the manager and used for that purpose only and at which there are adequate means for extinguishing any fire3; and only shells of a type approved by the Health and Safety Executive4 for filling and priming below ground may be so