Philip Martyn, of Crawley, was electrocuted while wiring a water-unit when another employee in a power switch-room turned on the electricity.
 
The investigation by the Health and Safety Executive (HSE) found that there were no systems for locking off the power and only tape to indicate which circuit could be switched on or off. The contractors were also working excessive hours to get the job finished, which may have resulted in poor decision-making.
 
The HSE said CFR Group should have carried out a risk assessment for the work. It added the company should also have ensured that adequate signage was used to indicate which power circuit could be turned on, and other circuits should have been padlocked.
 
HSE Inspector Anne Gloor said: "The judgment goes to show that companies should ensure that all staff are safe at work, and that there should be good arrangements for locking off all power supply systems."