The answer to 'why is my junction box burning smell' is that a burning smell coming from a junction box is a serious issue that requires immediate attention. This could be caused by faulty wiring, overloaded circuits, or a short circuit, all of which can pose a fire hazard.
Some common symptoms include a burning smell, visible damage or discoloration to the junction box, or flickering or dimming lights. If you notice any of these signs, it's crucial to shut off power to the affected area immediately and call a licensed electrician to diagnose and repair the issue. Attempting to troubleshoot or repair a burning junction box yourself can be extremely dangerous and should be avoided.