BS EN 12331:2021 pdf free download – Food processing machinery一Mincing machines – Safety and hygiene requirements.
— dismantling of the guard takes longer than 4 s;
— interlocking guard with guard locking.
4.2.3.5 Machines with continuous operation
4.2.3.5.1 General
On machines which cannot use an interlocked protective cover or an electro-sensitive protective device because they need to operate continuously, the following measures are necessary:
4.2.3.5.2 Safety distances
The design dimension (see 3.12) shall be  2 250 mm. This is only possible in connection with additional measures in 4.2.3.5.3. There the distance from floor to upper edge of a mechanical trip bar or an electrosensitive protective device shall be H1> 1 600 mm. The distance from the workstation on steps and platforms up to the hopper edge shall be> 1 100 mm (see Figure 8).
4.2.3.5.3 Additional measures
With a height of> 1 500 mm, a view into the feed intake hopper (e.g. by means of a mirror, fill level indication) shall be possible.
The machine shall be designed (e.g. vertical and smooth) to prevent the operator climbing on the machine. This also applies to movable steps in its upper position and the surrounding of mechanical trip bar/electro-sensitive protective device or movable protective grid at hopper edge.
Additional measures for:
a) steps or platforms
If danger points in the feed intake hopper can be reached from a workstation on step or platform (the design dimension (see 3.12) does not reach 2 250 mm, see Figure 7) the step or platform shall be interlocked. When the machine is running empty, the feeding screw shall come to a standstill within 4 s after the interlocking system has been actuated. The actuation shall be triggered when an ascendable position of a movable step is reached or the workstation on a step or platform is entered.
The interlocking system of the workstation on a step or platform shall comply with 4.2.1 and the safety- related parts of the control system shall present at least a Performance Level “c” according to
EN ISO 13849-1:20 15.
The workstation of steps shall have a width  500 mm and a length  400 mm and a toe rail of a height of 15 mm. If the workstation is < 500 mm above ground, an area of a width 400 mm and a length 350 mm is sufficient. The workstation shall be of the non-slip type. Platforms shall have an accessible area of a width> 500 mm. The length of the platform shall correspond to the length of the hopper.
Platforms which are located > 500 mm above ground shall be fitted with e.g. railings to prevent falls. Intermediate steps, stairs or step ladders and grab handles shall be provided if the step-up height to the step or to the platform is H3> 500 mm. The workstations and treads shall be sufficiently large and of the non-slip type and arranged at identical distances from one another.