Electrical equipment building a static charge - actually static charges in general really, an errant spark in the wrong place and whoops.
Pays to keep all of the primer steps together, get rid of any spare primers after that steps done and then get the powder out. I normally use a minimum amount in a metal cup, and top up from the container with only one type of powder out at a time just because I know what I can do in a moment of inattention (I can produce some spectacular cockups when I get started so I make sure I can't from the get go and have a really solid procedure in place so I don't miss a step or have any other options to cluster it up).
As far as fire, CO2 is a clean fire extinguisher - but the least effective of the mediums and can spread light items that are burning without extinguishing them making the cluster worse. Marginal cooling potential, no real capping ability so the stuff on fire may just reflash if you do extinguish it. Wouldn't recommend foam either, no good for some types of fires and can be bloody dangerous around live electricity. My recommend is dry powder ABE - a 2.5Kg size one or a couple of them will do the work for you if it's bigger than they can handle leave it and claim insurance. Not worth your life...
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