Electrical maintenance staff at Dreamworld were “distracted” by an electrical fault in another area of the theme park the day four people died, a ride maintenance operator told an inquest on Friday.

Fitter and turner Matthew Robertson was rostered to complete daily inspections of the Buzzsaw, Rocky Hollow Log Ride and Thunder River Rapids Ride on October 25, 2016, the day Sydney mother Cindy Low, Canberra visitor Kate Goodchild, her brother Luke Dorsett and his partner Roozi Araghi were killed on the rapids ride.

Cindy Low, Kate Goodchild, her brother Luke Dorsett and his partner Roozi Araghi died after being thrown from a raft at the theme park in 2016. Credit:Fairfax Media, insets supplied

On a “very busy day” maintenance crews could be sent to 20 "code six" events, where rides stopped working properly, Mr Robertson told the inquest on Friday.

He said he was sent to the first "code six" earth fault at the southern pump on the Thunder River Rapids Ride about 11.50am.