This is 'machinery' as defined in the Supply of Machinery (Safety) Regulations. It's also possibly subject to "safety services" requirements. Regardless, it's also subject to CDM Regulations, and Electricity at Work Regulations, for installation, commissioning, maintenance and decommissioning.

What does the manufacturer, and/or the overall design of the system, recommend? What does the CDM Risk Assessment say?

From BS 7671 perspective, in installations with certain earthing arrangements, a fuse (provided it could be locked off if required by EAWR) might do the trick ... but there are other factors at play here.

This is 'machinery' as defined in the Supply of Machinery (Safety) Regulations. It's also possibly subject to "safety services" requirements. Regardless, it's also subject to CDM Regulations, and Electricity at Work Regulations, for installation, commissioning, maintenance and decommissioning.

What does the manufacturer, and/or the overall design of the system, recommend? What does the CDM Risk Assessment say?

From BS 7671 perspective, in installations with certain earthing arrangements, a fuse (provided it could be locked off if required by EAWR) might do the trick ... but there are other factors at play here.