Is "under tension" a widely enough understood phrase to explain the presence of electric current? [closed]
Solution 1:
I would say that
Check that the machine is not live
is clear.
The Longman dictionary has the following definition of live in this context:
a wire or piece of equipment that is live has electricity flowing through it
From the comments, it is not sufficient just to say that it is unplugged or not connected to power. One has to be clear that it must be discharged.