Abstract: Embodiments disclosed herein include a compact wireless network-based monitoring device that can be placed inside an electrical connection box without an elaborate installation process to trigger a warning when there are dangerous conditions in the electrical wirings and installations. For example, the temperature or relative humidity are measured, and compared with a set of limits to send a warning message wirelessly. Many other conditions can be sensed and measures, such as levels of oxygen or various gases. If conditions are outside preset set limits, messages are sent to a gateway connected to the internet and/or to smart devices.