Electrosurgery can pose some risk to patients. Recently we experienced a case of accidental burning. Nine year-old patient received burn at the site of the ECG electrode attached to the right subclavian area during an electrosurgical operation. Even though the cutting and coagulation powers were not so much high, inappropriate earth with the fault of electrosurgical unit might lead to the generation of heat. To avoid recurrence, every electrical instruments should inspected, tested and required to be fault-free. Properly functioning surgical and monitoring units must be used.