Let's get one thing straight here, Fire Investigation is a science in itself, to label any fire as "electrical" because you can't be bloody well bothered to work out the real cause is nothing short of sloppiness, it is also doing your own kind a dis-service.
Any "fire investigator" that goes down that avenue needs to find a new job flipping burgers, after all, that is the wage he deserves.
It's no wonder fire investigators in the US have such a poor name.