High Tension or High Tensile ?
Not being earthed, I imagine the egg-beater would be fairly unfazed by any electrification (the radio might go a bit crackly).
Getting the wires tangled up in the whirly bit might be less convenient though....
Would certainly make the inmates hop about a bit on a rainy day if one of the wires broke and touched the floor of the patio or exercise yard or whatever.