Firefighters and electrical engineers were called after metre-high flames shot of a crack in the ground.
The Crawley crew was called to the scorched pavement outside Ottobock, Spindle Way, Three Bridges, at around 3pm today (Wednesday April 22).
A spokesman for UK Power Networks said engineers were working to reconnect power supplies to eight units in the area following a fault in an underground electricity cable.
Angel Sandekov (pictured right), an electrician for the Orthotics manufacturer, was three metres from where fire dramatically shot out of the gap in the pavement.
He turned around to see the flames rise as high as three feet and sounded like a Roman candle firework.
Angel, who had just parked his van, said: “I thought first the car had gone in flames.
“Seconds later I realised it was coming from the ground.
“It was loud, like a firework.”
Guy Mines (pictured left), Ottobock manager, said the factory had been suffering from irregular power cuts for a year.
A UK Power Networks spokesman said: “At 3pm today (April 22) we were contacted by the fire service after a report was received about an incident in Spindle Way, Three Bridges.
“A fault on an underground electricity cable had interrupted supplies to eight customers in the area and our engineers were swiftly at the scene to assist the emergency services.
“UK Power Networks engineers are working to reconnect all power supplies as quickly and as safely as possible. We apologise for any inconvenience caused.”