An Auckland man was electrocuted on a building site at Waiheke Island yesterday.

The Auckland Westpac Rescue Helicopter was called to the island at 5.28pm after the 27-year-old suffered an electric shock.

A helicopter spokeswoman said he went to grab an electircal wire and, as it was live, was thrown a short distance.

He suffered a burn to his hand.

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The helicopter crew airlifted the man from Onetangie to Auckland CIty Hospital in a serious condition.

He was not knocked out in the incident and did not suffer any other injuries.