A backup line is best described as which?

A backup line is best described as which?

• A. A decorative line for staging
• B. A second attack or supply line laid to ensure water if the primary line fails or to protect exposures
• C. A line used for testing only
• D. A line used to inject air into the system

Answer: (B)

In firefighting, a back‑up line is a second hose laid to support the initial attack and to ensure water if the primary line fails or to protect exposures. It provides redundancy so water can keep flowing even if the first line loses pressure, gets kinked, or otherwise can’t deliver water. It also helps shield adjacent exposures by delivering water to areas at risk, allowing firefighters to manage the fire from multiple angles and keep the interior attack progressing safely. This isn’t a decorative line, a test line, or a line used to inject air into the system.

In firefighting, a back‑up line is a second hose laid to support the initial attack and to ensure water if the primary line fails or to protect exposures. It provides redundancy so water can keep flowing even if the first line loses pressure, gets kinked, or otherwise can’t deliver water. It also helps shield adjacent exposures by delivering water to areas at risk, allowing firefighters to manage the fire from multiple angles and keep the interior attack progressing safely. This isn’t a decorative line, a test line, or a line used to inject air into the system.