Hi there John, As a Fire Officer here in NZ, I have to say the thought of this occuring never actually crossed my mind. Not that I've ever attended a fire in a computer room or the like. I'm not sure how things are in the UK, but over here we're required to wear rubber Live Gloves around anything too serious (electrically). Generally in a fire of this type we'd be using Carbon Dioxide extinguishers anyway or as a last resort Dry Powder.
