David Spurgeon was fixing a telephone fault in the roof void of a block of flats in Bow, east London, when he lost his balance and plunged through the ceiling.
"He managed to hold himself suspended for several minutes before his arms gave out, but was unable to call for help at the flat in Tay House on St Stephen's Road," news agency Court News UK reported at the time.
The Old Bailey heard that Spurgeon also suffered serious back injuries.
He was allowed to retire on medical grounds in 2013, about two years after the accident.
This attack on the employees and the victim were in my judgement and clearly the jury s judgement not necessary, misplaced and unfortunate.
There were a number of failures of health and safety management by BT which related to planning the work, supervision, and checking it was being carried out safely.