
Kriangkrai Praithuan, 24, from Nakhon Phanom, died at noon near Rama IV road.
He suffered from electrical burns on his face, arms and legs and fell from the sign on a three-storey building to the pavement below.
Another worker, Natthanon Siraprapharat, 20, told police that while Kriangkrai was changing the sign, there was an explosion and he fell.