@thankful
If I interpret your question strictly as written the answer is no. You cannot put a NEMA 5-20P (plug) on a 15A cable as it's a hazard -- even if you only use it on a device that draws <15A someone might use it on a device that draws more and cause a fire.
However what I think you mean to ask is "Can you use 15A power cords with 20A receptacles" and the answer is yes. The 5-20R (receptacle) is compatible with both 15 and 20A plugs and in fact most (if not all) audiophile receptacles are 20A ones (with the t-shaped top left female connection)
Can you use 15amp rated power cords with 20 amp plugs?
If I interpret your question strictly as written the answer is no. You cannot put a NEMA 5-20P (plug) on a 15A cable as it's a hazard -- even if you only use it on a device that draws <15A someone might use it on a device that draws more and cause a fire.
However what I think you mean to ask is "Can you use 15A power cords with 20A receptacles" and the answer is yes. The 5-20R (receptacle) is compatible with both 15 and 20A plugs and in fact most (if not all) audiophile receptacles are 20A ones (with the t-shaped top left female connection)