Document ID: chunk:federal_register_of_legislation:F2016L00417:body:0:p24
Version: federal_register_of_legislation:F2016L00417
Segment Type: other
Provision Reference: 
Character Range: 60878–63808

has a sufficient air change rate
      to increase visibility and keep dust exposures less than the relevant exposure standards when the cabinet is opened
    * have a dust tight light fixture, and
    * have interlocked doors to eliminate the possibility of the machine being operated while
      the door is open.
In conjunction with the air change rate, a suitable clearing time should also be allowed before opening the cabinet.
Cabinets should be regularly inspected and maintained in accordance with the manufacturer's instructions, especially in relation to gloves, gasket, door seals and structural integrity.

Blasting chambers
Blasting chambers should be constructed from an abrasive resistant, non-combustible material designed to prevent the escape of dust and minimise internal projections on which dust may settle.
Blasting chambers should have a mechanical exhaust system that effectively extracts the dust from the blasting chamber and which is arranged so as to prevent re-entry of the extracted dust into the blasting chamber and the workplace. Extracted air should be passed through a filtering or cleaning device that removes airborne contaminants before discharge. In a down-draught air flow blasting chamber, the ventilation system should produce a minimum air velocity of 0.3 linear metres per second; and in a cross-draught air flow blasting chamber, the ventilation system should produce a minimum air velocity of 0.4 linear metres per second in the direction of extraction.
The ventilation system ducts should be fitted with inspection ports and cleaning ports, ideally
at locations where dust might be reasonably expected to accumulate. Bonding and grounding should be used to prevent static build-up.
Blasting chambers should also have:
    * easily accessible operating controls and interlocked doors to prevent the machinery being operated while the door is open
    * windows or inspection ports which are fixed in a metal sash and constructed of toughened safety glass, laminated safety glass or safety wired glass. Windows or inspection ports should be maintained so as to allow effective visibility
    * an emergency exit located at the furthermost position from the main entrance that is signposted and backlit so that it is visible if the power is cut
    * a ventilation system kept in continuous operation whenever blasting is being done
      and for at least 5 minutes after blasting has finished or when cleaning, maintenance
      or repair is carried out on the chamber or cabinet, except where the operation of the ventilation system may create a hazard (in which case effective alternative means of ventilation should be provided)
    * an illumination of at least 200 lux measured on a horizontal plane one metre above the floor of the blasting chamber or enclosure
    * an electrical supply which complies with relevant standards, for example  AS/NZS 2381: Electrical equipment for