(1) Protect employees exposed to the hazards of screw
conveyor disposals with a properly designed and mounted
trimboard cover that remains in place during operation.
(2) Provide guarding to protect employees from contact
with knives or blades of disposal units.
• The guards need to be strong enough so that an
employee's downward thrusting motion will not cause the guard
material to open larger than two inches.
Reference:
• You may need to follow additional requirements found in, Make sure guards meet these requirements, WAC 296-806-20042, to keep employees from contacting the knives or blades of disposals.