In one aspect, a method of electrical arc fault detection when high frequency (e.g., RF noise) is present is disclosed. The method includes determining if first arcing criterion is met, determining if delay criterion is met, implementing a delay for a delay period if the delay criterion is met, and determining if second arcing criterion is met. If the second arcing criterion is met, then a trip signal may be sent to trip the circuit breaker. In another aspect, the method includes determining if first arcing criterion is met, starting delay period if the first arcing criterion is met, determining if delay criterion is met, and if the delay criterion is met, determining if second arcing criterion is met. An arc fault detection apparatus adapted to carry out the methods, and systems including the arc fault detection apparatus are disclosed, as are various other aspects.