Check the electrical load and ensure that the sensors do not exceed the 10 Amp maximum. In this guide, we'll walk through these. In modern power systems, distribution boxes are the core equipment for power distribution and control, and their stable operation is crucial to ensuring the safety and reliability of power supply. You need to know how to diagnose the fault in a low voltage distribution box safely. Below is a list of possible causes: Manual trip, due to an emergency power off (EPO) button being pushed. An alarm shutdown has occurred.