François Yves Le Gal wrote:

BTW, if an equipment has been designed for 2+1 grounded operation, it's
particularly stupid and dangerous to use a cheater.

No it's not. That Earth ground is only there for safety in the very
unlikely event that the chassis somehow becomes "hot". Really not a
big deal to defeat it with a cheater.

Note: Take the above advise at your own risk. 8)