Answer / jaybarnwal9534@gmail.com

simply, for the safety of lineman or electrician.
because isolator provides complete interruption of current

Answer / nagesh.patwari

Isolators are provided with interlocks on the both sides of CB in outdoor panel, reason is to identify either circuit is open or closed. Accordingly worker can take decision either to work on system or not. if CB open then isolators are also open.

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