Accidental contact with energized equipment causes 45% of all electrically related deaths in the workplace. Make sure you always test for voltage before you perform any work.
Test the area around the equipment you’re working on. Be sure to perform a site and risk assessment before doing any work, and when it’s possible, turn off the main power.
And of course, make sure you’ve had proper training before starting a job. It’s really important to avoid complacency. Every job is different, so be sure to follow the hierarchy of controls and other electrical safety work practices on every job. Be smart and stay safe.