There are a couple of videos showing the risk from a high energy fault. Most domestic work is after the main fuse but that is bad enough, post-DB it is slightly less risk as PSCC less and OCPD fast, but really it illustrates why you should do safe isolation and use CAT-III or CAT-IV test gear.Wow...!! The content on the video near the point of the explosion is really annoying but the message is clear !!
Also note the overalls as such arc-flash can give 3rd degree burns at short-medium distances before you can get your sorry behind out of there. Fire-retardant cotton ones like welders might use are sometimes rated for the basic arc-flash protection as well, but if working on big systems then appropriate risk assessment and PPE should be used.
Never wear nylon or similar garments close to such work as under arc-flash is melts and sticks to the skin making the injuries worse than cotton or similar natural fibres that might burn but don't do that.
Here is another video on fuse versus MCCB, not the most exciting viewing for a Saturday night but still shows the point about being able to safely break the PSCC in larger systems:
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