[bufbupa]

If the the insulation breaks the tool short circuits and the welding tips don't work. Electricity follows the path of least resistance, so given how close the welding tips are together I doubt it would ever choose to go through you; especially any of the sensitive parts of you. You'd have to be bizarrely well grounded for it to discharge current through your body.

[minitoar]

I vaguely remember standing on a rubber mat being standard practice for this sort of tool.