Abstract: A block-type aerial work platform facilitating height adjustment includes: a moving means (10) provided as a quadrangular frame (100) equipped with rollers (101) so as to be movable to a work position; a work platform (20) on which an operator boards to perform aerial work; and a lifting/lowering means (30) foldably installed between the moving means (10) and the work platform (20) to lift/lower the work platform (20).

Abstract: The present invention relates to a lightning protection apparatus using a TN-C common ground. A lightning protection apparatus using a TN-C common ground according to the present invention, which is disposed between a power source part and load facilities and is connected in series thereto in order to protect the power source part and the load facilities from lightning, includes: an input part surge protection circuit connecting to the power source part; an output part surge protection circuit connecting to the load facilities; a double winding transformer having a primary part and a secondary part, which connect to the input part surge protection circuit and the output part surge protection circuit, respectively; and common ground members connecting, respectively, to the input part surge protection circuit, the double winding transformer, the output part surge protection circuit, and the load facilities such that electric potentials applied to all of the former are the same as a reference electric potential.