Question: what is the difference between l14-20 and l14-30?
Answer: The "20" (in the L14-'20')stands for a rating of 20 amps (prong bent outward). The "30" in the L14-'30' stands for 30 amps (prong bent inward). So this difference keeps the user from plugging a 20 amp rated cord into a 30 amp rated circuit.