1. Install electrical systems and equipment. Electricians need to install various electrical equipment, such as cables, switches, distribution boards, etc., according to design drawings and specifications. 2. Maintain electrical systems and equipment. Electricians need to regularly inspect and maintain electrical systems and equipment to ensure their normal operation and safety. 3. Repair electrical systems and equipment. When electrical systems and equipment fail, electricians need to make timely repairs to restore their normal operation. 4. Detect and diagnose faults in electrical systems and equipment. When electrical systems and equipment have problems, electricians need to detect and diagnose, find out the cause of the failure and repair it.