I understand that you don't need an electrical engineering degree to be an electrician, but still, these are some fairly basic concepts in the electric power industry, especially the safety aspects, so you'd think someone working on live wires would know better.

Honestly, any halfway-intelligent person who travels internationally should know that Europe runs at 240VAC/60Hz, because this is really important if you want to use your American electronics there without a transformer. (When I went to Europe last, I brought my laptop, and an adapter which does not convert voltage, only the prongs, but that's OK because the laptop's power brick says it works on everything from 100VAC to 240VAC, as do a lot of electronics these days. But you have to check this first, you can't assume! Plugging a 120V-only device into this adapter could cause a fire.)

Luckily, the 50/60Hz stuff really doesn't matter these days except maybe for some digital clocks on appliances.