Thanks , everyone!

This may sound silly, but I've never run across a central vacuum system....is it cord-n-plug or fixed wiring? Why do I ask, because if it is cord-n-plug, then I understand how to get the answer to a similar ICC exam question. If not, I'm lost again....

A 1,500-VA, 102-volt central vacuum system is located in the garage. The minimum requirements for supplying branch circut to this load are:

A) 15amp circuit with single receptacle.
B) 20amp circuit with single receptacle.
C) 20amp circuit with single receptacle, GFCI protected.
D) 20amp circuit with duplex receptacle, GFCI protected.

The answer is B....if a cental vacumm system is cord -n- plug , then the required min amp is 1500/120=12.5. 12.5/.8 = 15.74 amps, round to 20amp. E3801.9 requires only a single receptacle for a garage. Thus, I can get to answer B.....but if the vacuum system is not a cord-n-plug, then I'm lost again.