Construction sites are inherently dangerous. Compounding the danger is the fact you must often work with or around other trades. Good communication is key. Don’t rely on your foreman or project manager to prevent all conflicts and misunderstandings; word doesn’t always get to the right people in time, despite good intentions and best efforts.
Yes, people in other trades “should” know to stay clear of equipment that the electrical crew is planning to energize. But before you close that breaker, personally check to ensure other tradespeople aren’t near the panel (in case of arc flash or blast) and aren’t near the utilization equipment (in case of misoperation). Don’t forget that many types of test equipment also put dangerous energy into wiring systems.
What if a pipe fitter or carpenter wants to borrow your DMM to “check for voltage”? That person isn’t qualified, and can easily miss something. That person can also damage your meter. Walk that person to your foreman to get the testing set up through proper channels.
