The answer to 'why is my junction box hot to touch' is that a hot junction box is often a sign of an electrical issue that requires immediate attention. This could indicate a problem with the wiring, connections, or overloading of the circuit.
Some common causes of a hot junction box include loose or damaged electrical connections, a short circuit, a problem with the circuit breaker, or an overloaded circuit. If the junction box is hot to the touch, it's important to address the issue promptly to prevent the risk of fire or electrical shock.