The complexity of electrical installation in a building will depend on the function or operation of the building in question. On the other hand, power supply is very important to support the building operation. However, it is very often difficult to locate which point in the power distribution system that experience electrical fault. This study attempts to solve such problem by designing a prototype of monitoring and controlling system of power distribution in school buildings. To this end, we use Arduino-based system and Wonderware InTouch for the user interface. This study resulted in a power monitoring system consisting of voltage sensor and electric relay connected to Arduino ATMEGA 2560. The system can be configured, monitored and controlled through a computer software.

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