The answer to 'why is my junction box circuit overload' is that a junction box circuit overload is typically caused by too many electrical devices or appliances being connected to the circuit, resulting in a demand for more power than the circuit can safely handle. This can lead to the circuit breaker tripping or the fuse blowing, cutting power to the affected area.
Some common symptoms of a junction box circuit overload include dimming or flickering lights, outlets that don't work, or a circuit breaker that keeps tripping. To fix the issue, you'll need to identify and remove any unnecessary devices from the overloaded circuit, and potentially upgrade the circuit to handle the additional electrical load. If the problem persists or you're unsure of the cause, it's best to call a licensed electrician to diagnose and resolve the issue safely.