SepticSceptic:Way back when I did my ESTA it required a 100% pass on the appliance test.
Handle9:
Your analogy of more limited work being conducted by less skilled people exists now, that is why there are ESA and EST qualifications available.
Personally, the 60% pass mark is way too low, considering that they are working with lethal voltages, and customer appliances.
It should be 85% or better, the questions are not that hard ...
A gun license requires 100% pass, and has just as much lethal potential.
