The coroner looking into the deaths of the maintenance contractors in December 2010 recorded a narrative verdict on July 23.
"It is our view that the death of each man was the result of a failure to adopt appropriate procedures."
James Bibby and Thomas Elmer were working on a conveyor, which started up automatically.
The court was told the men had not been shown how to isolate the power from the conveyor. "While there was a risk assessment carried out on the specific work undertaken by the men it appears this was not communicated to the men directly."
