The answer to 'why is my junction box tripping breaker' is that a tripped breaker at the junction box is usually caused by a short circuit or overload in the electrical circuit. This can be due to faulty wiring, damaged electrical components, or too many devices being powered by the circuit.
Some common symptoms include flickering lights, buzzing or humming sounds from the junction box, and the circuit breaker tripping repeatedly. To troubleshoot, you'll need to inspect the junction box and associated wiring for any damage or issues. If you're not comfortable working with electricity, it's best to call a licensed electrician to diagnose and repair the problem.