All the well known manufacturers produce nice brochures about the principles of electrosurgery.
Similarly, instruction manuals for modern ESU’s mention that using two machines is often convenient or even essential. Each manufacturer lists points to be observed, but in general (as has been mentioned above) only two units of the same electrical type should be used.
I should imagine that the real danger is more from someone accidentally hitting the wrong foot-pedal!
But I must agree with Richard here. We are not (highly paid) surgeons, after all. Let’s leave the surgical decisions to them!
