Metal cased switch mode power supplies should never be used un-grounded.
Different with plastic cased double insulated ones.
Another RS Ormerod Mk1 meets the world
Retired now but I used to make....
CNC Machined Mk1 aluminium bed support plates for the Ormerod
CNC machined X-plates and ribs for Mk1 & Mk2 Ormerods
CNC machined bed support arms for the Mk2 Ormerod.
Dual Hot-End heatsink blocks.