The extension adds 31"
Total 122" or 10 feet.
Based on reports of users it can become difficult to use at this length unless using it almost completely vertical. Those that have added a second extension (not recommended by the manufacturer) state the same issues with ability to handle the tool compound as it length grows.
So, they do offer a 10 foot total length pole saw and probably do not offer any more as its safety and usability are questionable.
Power Lines Carrying Under 150 Volts
There's a specific rule for power lines and conductors where the voltage does not exceed 150 volts to ground. The required minimum clearance is 10 feet above finished grade or sidewalks, or from any platform or projection from which the lines might be reached (and are accessible to pedestrians only). This distance is regarded as safe to allow for the passage of pedestrians even while carrying tools or other items.Power Lines Carrying 300–600 Volts
For power lines not exceeding 600 volts over residential property, including driveways and other areas of non-commercial traffic, the minimum required overhead clearance is 12 feet. The same requirement applies to lines 600 volts or less over commercial areas that are not subject to truck traffic.
For power lines not exceeding 600 volts in commercial areas, the minimum overhead clearance is 18 feet for the following locations:
- Public streets
- Non-residential driveways
- Roadways and parking areas subject to truck traffic
- Other areas subject to vehicle traffic (such as farm equipment, forestry operations, etc.)
Remember, just because power lines are strung high enough in normal conditions, icy conditions and downed tree limbs can bring power lines dangerously close, so beware!
As for cutting limbs directly overhead, after a 2" branch fell on top of my head and caused a deep gash that bled profusely, I now wear a helmet when using the pole saw. The next time I used it, a branch fell on my hand, causing the arthritis in my thumb to flare up for days. So now I wear gloves, too, not that they would help much. Lastly, don't forgot the goggles for when the sawdust falls in your eyes. I'm a risk taker and slow learner, so probably not a good match for any kind of power equipment. I'm just saying things can go wrong. Plan ahead.