If your 20 amp lineis protected by a 20 amp breaker then I would use a 20 amp rated power chord. If the breaker is only 15 amp then the 15 amp chord will be ok.
03-18-12: Ahendler
How about a little radio that sets on a kitchen counter that has a 15 amp plug and a 2 wire 18 gauge power cord?
The branch circuit is 20 amp.

