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Anywhere where double pole isolation or disconnection is required, such as when one RCD is feeding another and a N-E fault needs to be cleared.
Is this homework?
 
For isolation of an circuit on a TT supply where you need individual RCD protection to that circuit (in addition to the main incomer RCD).

You can't call a circuit on a TT supply isolated until you've disconnected all live conductors.
 
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