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what is means by Bus Isolator and explaint that function also
When do you need the answer to you're honework? We do take a while to respond.
See: "What is Bus Post Insulator?" thread from 11/22/2012
"Bus isolator" could be also Busbar Disconnector: it ensures safety during maintenance and repair work on the disconnected busbar. The line isolator ensures safety work on the disconnected line.