Practice question

A BBS (battery backup system) for a typical NEMA signal cabinet is generally sized to:

  1. Power the intersection in full color for at least 2 hours, then drop to red flash for several more hours
  2. Power only the cabinet fan
  3. Replace utility service permanently
  4. Only protect the controller, not the field signals

Answer: A — Power the intersection in full color for at least 2 hours, then drop to red flash for several more hours

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