Backing Into an 11-Foot Lane
At 02:10, a 100-foot tractor-drawn aerial is dispatched to a three-story garden apartment with fire showing from a second-floor rear unit. The street is 22 feet wide with parked cars on both sides, leaving a single 11-foot lane. A large oak canopy overhangs the curb, and a 13.8 kV primary line crosses at 26 feet above the roadway. The driver/operator wants the turntable 40 feet from the building, which requires backing the trailer about 15 feet along the lane. The tiller seat has a clear view of the right side but not the left rear. The driver is using the intercom and asks the tiller operator to stay seated while backing. The aerial must go to the roof within four minutes.
1. The driver asks the tiller operator to remain seated while backing the trailer 15 feet. Should the tiller operator comply? Outline the decision and the communication sequence.
Read the worked answer
No, not automatically. The tiller seat gives a useful view of the right side and the trailer wheels, but it does not show the left rear, the gap between the trailer and the parked cars, or the space behind the trailer. In an 11-foot lane with a 100-foot aerial, a 15-foot backup leaves very little margin, and the driver cannot see the left rear either.
The tiller operator should tell the driver to stop, confirm the apparatus is secured, and dismount to a ground spotter position at the left rear corner where both the driver and the path are visible. Communication should use the intercom or radio with short, standardized commands: stop, back 5, left 2, right 1, hold. If radio or intercom contact is lost, the driver stops until contact is restored. Hand signals are a backup only when continuous eye contact is maintained. The tiller operator must not stand between the trailer and a parked car, a wall, or the path of the trailer. After the backup, the tiller operator re-boards only when the apparatus is stopped and the driver confirms.
2. The driver wants to raise the aerial between the oak canopy and the 13.8 kV primary line at 26 feet. What is the go/no-go decision, and what alternatives would you recommend?
Read the worked answer
This is a no-go unless the required clearance from the energized line can be maintained through the entire raise and operation. The line must be treated as energized, and clearance must come from department policy and the utility, not from the tree canopy. The canopy is not a clearance reference; it blocks the operator's view and may push branches into the aerial. The conductor may also sag lower than 26 feet at mid-span, especially with wind or heat.
The tiller operator should support the driver in stopping the raise and reassessing. A better option may be to spot the turntable on the near side of the line and reach the roof at a lower angle without passing the wire. If the geometry still cannot preserve clearance, the driver should request utility de-energization or use ground ladders for the second-floor fire while the aerial is held for roof access only after the line is controlled. Do not raise through the canopy to save time. The four-minute target does not override electrical clearance or stability.