I have a multiple outlet cord on the floor for my fish tank,I heard a snap and noticed the cord caught fire at one of the plugs which I put out right away,the multiple outlet didn't trip or the breaker (20 amp) at the box for that outlet.
You might check to see if you have too much pluged into the cord, it may have overheated and started on fire. Those triple tap cords are not very heavy. The snap you heard may have just been the insulation on the cord finally bursting into flames and not have been a short at all
And as a forethought you have to remember that not all breakers react the same way. Some you cant get to trip even if they have a direct maintaned short while others will short just by looking at them wrong. Anytime you get a arc too neutral from a hot wire it should trip the brkr or blow the fuse because the arc itself will reach the trip level of most brkrs in micro seconds so I still think it is the coating on the wire bursting into flames that made the snap sound
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