A ________ line should always be used at the same time as the primary attack hose line.

A ________ line should always be used at the same time as the primary attack hose line.

• A. Back-up
• B. Booster
• C. Secondary
• D. Ventilation

Answer: (A)

Having a back-up line should be laid and charged at the same time as the primary attack line. This second line provides an immediate additional water stream to support the first line, helps protect the firefighter operating the nozzle, and gives you a ready option if the initial stream is overwhelmed or if conditions change. With both lines in place, you maintain control of the fire and reduce the risk of losing the attack due to a line fault or flame surge. A booster line is a smaller line used for lighter tasks, not the standard partner to a structural attack; a secondary line can refer to another line but the term used in this context is back-up line; ventilation is a separate tactic that affects fire behavior, not a water-delivery line.

Having a back-up line should be laid and charged at the same time as the primary attack line. This second line provides an immediate additional water stream to support the first line, helps protect the firefighter operating the nozzle, and gives you a ready option if the initial stream is overwhelmed or if conditions change. With both lines in place, you maintain control of the fire and reduce the risk of losing the attack due to a line fault or flame surge. A booster line is a smaller line used for lighter tasks, not the standard partner to a structural attack; a secondary line can refer to another line but the term used in this context is back-up line; ventilation is a separate tactic that affects fire behavior, not a water-delivery line.