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When the first line is struggling against fire and requires assistance. (correct)
Whenever they find time during the operation.
When entering a room with no active fire.
When the first attack line has extinguished the fire.

The volume and intensity of the fire. (B) Signup and view all the answers

To stretch one or two more hose lengths than the first line. (C) Signup and view all the answers

The status and location of the first attack team. (A) Signup and view all the answers

To prevent the fire from spreading to adjacent areas. (B) Signup and view all the answers

They should direct their streams into the same area as the first line. (A) Signup and view all the answers

Identifying alternate exit routes for civilians. (D) Signup and view all the answers

The first line's efforts are enhanced by the backup line's presence. (D) Signup and view all the answers

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The backup team's primary responsibility is to provide support to the first attack hose line.
This support can be in the form of backing up the first line, augmenting its efforts, or protecting it from exposure.

The backup team typically stretches a second hose line along the same route as the first line.
The backup team may be called upon to:
- Advance to the same position as the first line and operate in unison to extinguish the fire.
- Protect the first line from fire in other rooms or areas by darkening down the fire threatening them.

The backup line should be stretched to the floor above the fire when the fire's intensity warrants it.
The backup team should ideally stretch their hose line to a greater length than the first line.
The first line focuses on extinguishing the main body of fire, while the backup line prevents fire spread to the floor above or nearby exposures.