Which term describes a system of three or more large, interconnected air cylinders used to recharge smaller cylinders?

• A. Certification Test
• B. Bonding
• C. Cascade System
• D. Automatic Electrical Load Management

Answer: (C)

A cascade system is a group of three or more large high‑pressure air cylinders connected together so air can be transferred to smaller cylinders for refilling. In practice, air is stored in several big tanks and routed through manifolds with regulators, allowing a SCBA or similar cylinder to be filled efficiently by drawing from successive banks. This setup provides a steady, high-pressure source and enables rapid refills without relying on a single cylinder or a separate compressor every time. The other terms don’t describe a refilling arrangement for breathing-air cylinders, as they pertain to certification testing, electrical grounding, or electrical load management rather than compressed-air refilling.