For a basic overview to introduce this subject to H&S Reps, I found this video to the point, without being too long and boring. Ideal for refresher training. Note, I am from South Africa, but my experience has shown it does not matter where in the world you stay, health and safety rules and regulations pretty much remain similar. I found this video very useful. Nice informative video with some great production value too (which isn't usually the case in these types of educational videos). Goes over things quickly and uses an example that could happen on quite a few worksites.