Patent ID: 7557733

Claim:
An airfield lighting system, comprising: an airfield series circuit including a transfer relay having first and second sides, and a primary regulator operatively coupled to an airfield series loop of an airfield at the first side of the transfer relay; a standby regulator operatively coupled to the airfield series circuit at the second side of the transfer relay; the transfer relay movable between primary and standby modes of operation; the primary mode of operation comprising the first side of the transfer relay closed directing lighting power to the airfield series loop from the primary regulator, and the second side of the transfer relay open isolating the standby regulator from the airfield series circuit; and the standby mode of operation comprising the second side of the transfer relay closed directing lighting power to the airfield series loop from the standby regulator, and the first side of the transfer relay open isolating the primary regulator from the airfield series circuit.