The wider group including Clear Route Utility Services Ltd, Northern Reliable Industrial Services Ltd and Reliable Construction Ltd are not in administration and will continue to trade as normal.
Nicholas Edwards and Robert Harding of Deloitte LLP were appointed joint administrators of Murphy Limited on 22 October.
Murphy specialises in laying underground electrical cables primarily for utility companies. Prioer to administration it employed 327 people across sites including its London head office at Tottenham Hale, and regional offices in Manchester, Penrith, Preston, Sheffield, Ashford, Stanlow and Bradford.
The administrators said that "there was no alternative but to immediately cease trading, unfortunately leading to 293 staff being made redundant on 23 October 2013".
The few remaining staff are helping the administrators explore options for disposing of assets.
Joint administrator Nick Edwards, a restructuring services partner at Deloitte, said: “The company has suffered a prolonged period of difficult trading which has resulted in it being unable to meet its financial obligations. Regrettably, owing to the nature of the services provided by the business and the investment required to continue to trade, there is no other option but to announce these redundancies at this time. We have sought to retain a number of employees for the present time to assist the administrators with an orderly wind down and sale of Murphy’s business and assets.”