Jan 10 (Reuters) - Fire agencies are investigating

whether Southern California Edison's utility infrastructure

sparked a brush fire that is still burning in a Los Angeles

suburb, SCE said Friday, adding no determination has been made.

SCE, a unit of U.S. utility Edison International ( EIX ),

said in a filing to its regulators that a downed conductor was

discovered at a tower associated with its Eagle Rock - Sylmar

220 kV circuit.

"SCE does not know whether the damage observed occurred

before or after the start of the fire," the utility said.

SCE said preliminary information shows the circuit

experienced a relay at 10:11 p.m. (0611 GMT) where the Hurst

fire was reported around 10:10 p.m. on Jan. 7.

The Hurst fire, in Sylmar in the San Fernando Valley

northwest of Los Angeles, has exceeded 770 acres and is now 77%

contained, according to the California Department of Forestry

and Fire Protection.

Edison International ( EIX ) did not immediately respond to a

request for comment made via the company website.

SCE on Thursday said it had received notices from insurance

companies to preserve evidence related to the Eaton Fire that is

still burning in Los Angeles, but said no fire agencies have

linked the utility's connection to the fire.

More than 10,000 structures have been destroyed by five

fires raging in the area and nearly 30,000 acres have been

burned.

Private forecaster AccuWeather has estimated the damage and

economic loss at $135 billion to $150 billion, portending an

arduous recovery and soaring homeowners' insurance costs.

(Reporting by Devika Nair in Bengaluru)