EN agreement/countable with VAC

These sentences:

  • 250 VAC, 6 A
  • 100 VAC to 240 VAC, 50 Hz to 60 Hz, 160 VA input, 135 VA output
  • Tradename1 Model1 platform operates on AC input, which operates on 100 – 240 VAC, 50/60 Hz, 100 -120 VA rating.
  • Alternating current (AC) main voltage must be 100 to 240 VAC (50 to 60 Hz).
  • etc etc

Get this error message: “Possible agreement error. The noun ‘VAC’ seems to be countable.”

def: VAC (Volts Alternating Current) is a measure of the strength of the alternating electric field that drives the flow of electrons in AC electrical systems.

As a side question… is this is the right place to submit these for consideration?