That cable doesn't bother me at all. What I find alarming is that it doesn't have a bright laminated warning label affixed to it in a _very_ permanent manner.

That cable doesn't bother me at all. What I find alarming is that it doesn't have a bright laminated warning label affixed to it in a _very_ permanent manner. On the plus side, as long as the electricians who wired the place up were competent the risk of any harm resulting from ignorance is almost nonexistent. Circuit breakers are quite good at what they do and wiring generally has very wide safety margins. Edit: On further thought, there is an issue here. Regardless of the breaker, that plug (the 5-15P) and associated receptacle are unlikely to be rated for 20 amps of sustained current. In that case, the breaker might not be able to prevent you from melting something or starting a fire.