An independent investigation will probe how a 15-year-old girl suffered an electric shock near a construction site for Sydney's CBD light rail project.
NSW Premier Gladys Berejiklian on Tuesday described the incident as "appalling" and "absolutely devastating".
Fifteen-year-old Anna Lambden was injured at Haymarket on Sunday near a light rail construction site after she took off her uncomfortable shoes and walked towards the train station in wet socks, according to her mother Viola Morris.
Passers-by who tried to help the teen were also shocked when they touched her, Ms Morris wrote on social media.
Ms Morris posted a photograph of herself and her daughter in Royal Prince Alfred hospital on Facebook on Monday, saying the incident could have been "catastrophic".
Ms Berejiklian said it was unacceptable.
"No pedestrian anywhere around a construction zone, no matter what project or incident it is, should have to face that risk," she told reporters in Sydney on Tuesday.
Transport Minister Andrew Constance says the secretary of the department will investigate the accident, independent of all third parties, including Roads and Maritime Services and the light rail project.
"Work has stopped on site at the moment until that initial investigation is undertaken and we can work out exactly who is responsible and what has occurred," he told reporters.
"At this stage that is not clear. Ultimately we're very, very sorry to that family."
Asked whether the government or light rail could be liable, Mr Constance replied: "Let's just get to the bottom of what's happened first and go from there."
Transport NSW deputy secretary Tony Braxton-Smith says the "unusual incident" is being taken "extremely seriously".
"I can assure people that there have been teams on site to make sure the site is electrically safe," he told 2GB on Tuesday.
Labor leader Luke Foley called for the investigation to be carried out "as a matter of urgency".
"What I want to know is that everyone working on the light rail project and everyone who's in the vicinity of the light rail construction zone is going to be safe," he told reporters.
"Today, we can't give that assurance to anyone that they are going to be safe."
Labor's deputy leader Michael Daley blamed the government's previous cost-cutting measures to the NSW Department of Roads and Maritime Services and transport agencies.
"They don't have the capability to have project managers of their own on-site any more, and this is what happens when you cut budgets," he told AAP.