The answer to 'why is my electrical wiring burning smell' is that it indicates a serious electrical issue that requires immediate attention. A burning smell from electrical wiring is a sign of overheating, which can be caused by a short circuit, loose connection, damaged wiring, or overloaded circuit. This is a fire hazard that should not be ignored.
If you notice a burning smell from your electrical wiring, shut off power to the affected area immediately and do not attempt to use that circuit until the problem is identified and resolved. Trying to continue using the circuit could lead to an electrical fire. You should call a licensed electrician right away to inspect the wiring and make any necessary repairs.