It is used to alert you to potential personal injury hazards. Safety alert This is the safety alert symbol. The addition of either symbol to a Danger or Warning safety label indicates that an electrical hazard exists, which will result in personal injury if the instructions are not followed.The Eng-Tips staff will check this out and take appropriate action. Hi all, for those having to draw electrical schematic complying with IEC-617, you can find free of charge on my website all the symbols you need for business Thank you for helping keep Eng-Tips Forums free from inappropriate posts.