I have to agree with Greg that what is plugged-in would be a primary cause. A lot used to be attributed to 'overfusing', in the days (and areas) that edison base fuses were prevelant, of which I saw my share.
I remember the guy at a local hardware store commenting something to the effect of....'we used to sell a lot of 15 & 20 amp fuses; but since a lot of people started buying the 30's, sales have slowed way down'.
Fire cause determined to be caused by 'electrical' seems to be vague; it should be broken out into utilization equipment and premises wiring.
