I want to know the answer to the following question:
What invention prevented lines from getting mixed?
All the background I'm provided with is that "This is achieved by Neutral Sections (also known as Phase Breaks), usually provided at feeder stations and midway between them although, typically, only half are in use at any time, the others being provided to allow a feeder station to be shut down and power provided from adjacent feeder stations.". Is that enough to answer the question?
Answer: yes