The incident occurred on Tuesday afternoon in the garage of battery supplier WAE (formerly known as Williams Advanced Engineering) at the Circuit Ricardo Tormo in Spain.
Running was postponed at the test indefinitely while a full investigation was undertaken by the FIA and WAE, before the governing body confirmed that testing could resume on Thursday afternoon.
The FIA has since revealed further details about the incident which occurred when the DS Penske of Robert Shwartzman came to a stop on track during Tuesday morning’s opening three-hour session.
The automatic battery safety system was triggered in the car causing it to stop with the red light visible as per safety protocol, before it was taken back to the pits, where the battery was removed and taken to WAE.
The FIA stated that “while being manually inspected by the battery single supplier team, there was an arc flash and some sparking, that resulted in a localised fire”.
Source: Autosport