A broken water pipe flooded a switchboard at RCA's office. The flood tripped the switchboard circuit breakers and deactivated the air-conditioning system. Three employees were assigned to fix it: an electrical technician with twelve years on-the- job training, a licensed electrician, and an electrical engineer with twenty years of experience who had studied power engineering in college. They switched on one of the circuit breakers, although the engineer said he knew that one was supposed to test the operation of a wet switchboard before putting it back into use. There was a "snap" and everyone ran from the room up the stairs and a "big ball of fire" came after them up the stairs. The plaintiffs argued that the manufacturer of the circuit breaker had been negligent in failing to give RCA adequate warnings about the circuit breakers. How should the court rule, and on what theory should it rule?