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For the automatic source changeover sytem with controllers between two Masterpact NW devices , Do we have to use the IVE unit ?

The IVE unit is an electrical interlocking unit , which provides more safety in interlocking procedure in order to have (Mechanical and Electrical interlocking)
it's preferable to use it , but there is already a basic mechanical interlocking system , so it's not mandatory but it's preferable for more safety
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