Graph showing the trend of the number of home electrical fires per year. At Morningstar Electric, we believe the downward trend of fires per year may be attributed to the requirement of arc fault breakers as part of the last three editions of the National Electrical Code, or the trend could be explained by the requirements of insurance companies to replace knob and tube wiring, and in some cases aluminum wiring, before a policy is written. The graph was shown on FEMA’s website at http://www.usfa.fema.gov/statistics/