While operating a 100' quint @ a large furnitire warehouse fire our 100' quint turntable started to slowly rotate the opposite direction from the direction of the fire stream. The problem seems to be when flowing close to the 1000 GPM manufacturer recommendation in any direction, the nozzle when rotated close to a 45 degree angle from left to right creates enough back pressure to over ride the springbrake for the turntable. While we were over the recommended 10' from power lines, by the time the operator noticed the problem and took corrective action (attempted to move the ladder to the left, not the nozzle) caused the ladder to drift faster and came in contact with the power lines. The lines had been de-energized but this was a very close call.

LESSONS LEARNED:

1. Moving the nozzle back to center point would have stopped the movement of the ladder.

2. When a person is on the quint itself we will have 1 person at the turntable and 1 person at the pump panel. We only had 1 person assigned to the turntable and that person had left the turntable area to do other tasks.

3. The manufacturer is looking at the springbrake problem to see if there is a fix.

4. Rewriting our training guide for quint operations to not rotate the nozzle more than 30 degrees off center of the ladder.