The 22-year-old from Walthamstow, who does not want to be named, was unable to return to his normal duties for two months as a result of the incident at Kemlows Die Casting Products Ltd, in Charlton Mead Lane, Hoddesdon, on 31 July 2012.
The company was prosecuted by the Health and Safety Executive (HSE) after an investigation identified serious concerns with the chosen system of work for the cleaning.
Hertford Magistrates' Court was told that workers accessed the light fittings using a goods stillage, a cage without fork channels, which is not designed to carry people. The goods stillage was raised into position by a fork lift truck.
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Two to three hours into the job, the stillage had become so unstable that it fell with the worker inside. The cage landed three feet below on the concrete floor, injuring the worker who was still in it.
HSE's investigation found that nothing had been used to secure the stillage to the fork lift truck.
The court heard that Kemlows had adopted this system of working at heights of above three metres on a regular basis for annual summer shutdown tasks since at least 2005. The company also used a similar system to carry out other maintenance activities, such as fitting pipework.
Kemlows Die Casting Products Ltd, of Yeomans Court, Ware Road, Hertford, was fined £6,000 and ordered to pay £3,500 costs after pleading guilty to single breaches of the Work at Height Regulations 2005 and the Lifting Operations and Lifting Equipment Regulations 1998.
(CD/JP)
