| 摘要 |
PROBLEM TO BE SOLVED: To shorten the working period of a gate and fence, and promote the popularization of external electric equipment by installing a power supply unit where low voltage of 36V or less can be supplied to the external electric equipment. SOLUTION: External electric installation is provided to a gate and fence 15 which is installed in the exterior part of a building 10, and includes an intercom, an electric lock of a gate, a nameplate light, and exterior lighting apparatus such as plant lighting lamps. The external electric installation is driven at low voltage of 36V or less. Therefore, the external electric installation is provided with a power supply unit 19. The external electric equipment and the power supply unit 19 are connected through electric wires and/or cables. It is possible to install the gate and fence 15, and the external electric installation on the gate and fence 15 by one external installation construction worker. As a result, it is possible to shorten working period for building the gate and fence where external electric installation are installed, and promote the popularization of the external electric installation. |
