Yes, you can lock your meter cabinets. There are several reasons why people around the globe prefer locking their electric boxes. Some residential users do this to protect their privacy. In comparison, commercial users prefer locking their meter boxes to prevent property damage. If not done in time, this property damage can be expensive to fix. Also, if the power is disconnected for long, electric devices will malfunction and cause you other damage. So to avoid such disasters, people prefer and have the right to lock their meter boxes.