It is recommended to have electrical systems checked periodically to ensure they are safe and up to code. For residential properties, a general rule of thumb is to have an electrical inspection every 10 years, or more frequently if there have been major changes or renovations to the property. Commercial properties may require more frequent inspections, typically every 1-5 years, depending on the type of building and electrical system. It's important to consult a licensed electrician to determine the appropriate frequency of electrical checks for your specific property.