Dublin Fire Brigade is trying to identify the cause of the fire and sources said one avenue investigators are looking at is the condition and operation of the power supply into the site at Carrickmines.
Dublin Fire Brigade, assisted by the Garda Technical Bureau and ESB Networks, is examining if some malfunction in the circuit board was a possible “ignition point” for the blaze.
Family relatives have identified the deceased as couple Willie Lynch and his pregnant partner Tara Gilbert, and their daughters Kelsey, aged four, and Jodie, aged nine.
Willie’s sister Sylvia and her husband Thomas Connors, along with three of their children, Jim, aged five, Christy, aged two, and Mary, just five months old, also perished.
Willie and Sylvia’s brother Jimmy died too. A fourth Connors’ child, Mick, aged six, is in a serious but stable condition in hospital.
It is thought gardaí may have to take DNA samples from families of the deceased in order to confirm their identities.
Willie and Tara, and Jimmy, live in Fassaroe estate in Bray, Co Wicklow, and were visiting the Connors at their portable building on Glenamuck Road in Carrickmines on Friday.
Emergency services were alerted to a fire by families living in the other three portable buildings on the small halting site just before 4am.
Six Dublin Fire Brigade units, three ambulances, and four Garda patrol cars arrived at the scene, which was described as “absolutely horrific”.
Nine of the bodies were found inside the Connors’ cabin. Baby Mary had been taken out and brought to hospital, where she was pronounced dead.
Investigators suspect all 10 died from smoke inhalation before being consumed by fire.
The site’s circuit board, described as like an open transformer box, is located close to the portable building.
Traveller representative organisations said the focus had to be on the grieving families, but that there needed to be a thorough investigation into the cause of the fire and fire safety measures at the site.