None of us are lawyers (as far as I know), so ultimately, what we think may not be worth a hill of beans. But, MY employer has a very comprehensive safety policy and I was required to sign it as a condition of employment, and I have to sign it again every year after reviewing it again (legally it's only every 3 years max, but I think they don't want to try to keep track of everyone's anniversaries). In that policy, we are forbidden from performing work entailing exposure to electrical hazards unless qualified, by OUR process, to do so, including all PPE requirements set out in OUR policies. This applies to ANYWHERE we work and because we have facilities and customers in other countries, it expressly says anywhere in the world, regardless of differences in local requirements. So for me, it's clear cut, no ambiguity. I can literally lose my job if I get caught violating our safety policies in Mexico, Egypt, or New Jersey.
Per your Egypt scenario, if your employer didn't have a safety shoe requirement, and the Egytian company didn't either, and you got your toes chopped off and you sued your employer, a lawyer might be able to successfully argue that you were out of the jurisdiction in which the OSHA rules applied so there was no gross negligence and you get nothing. But the next day, OSHA could waltz in and fine, shut down or even arrest your employer just for not HAVING a safety policy that protects their workers, because although it may not have applied in Egypt anyway, it was exposed in court that the minimum safety requirements of your employer were not up to OSHA standards. Everybody loses (except the lawyers of course).
Many people are shocked when they discover I am not a good electrician...