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For the NSX Micrologic 5.2E with part number LV429095, Is it mandatory to use ENCT with part number LV429521 ?

 
The ENCT (External Neutral Current Transformer) in NSX or the External Neutral Sensor in the ACB's is required depending on your application or requirement. If you need Neutral protection or Earth/Ground Fault Protection, then the Neutral CT is mandatory with 3P NSX or 3P ACB's. If you have 4 pole breaker, then the external neutral is not required. 
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