For portable units they make a lock that goes over the plugs and a cable can be added. That way you can't unplug it. Takes a regular paddle lock.
I still prefer hard wired for a lot of reasons. But each to thier own s they say.
Ref the grounding concerns on portable gennys. Literally a millions of portable gennys are used every day as they are for RVs, race haulers, farms, etc etc. and never hear of these concerns causing problems. I'm sure there are basis for this issue but not so much.
I have used gennys for 20 yrs and all good. I may just be lucky though ����
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