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Home > Forums > Electrical / Electronic Engineers > Activities > Electric Power & Transmission & Distribution Forum

NC contact of 27 relay

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odlanor (Electrical)

12 Jul 12 9:22

by convention, relays in elementary diagram represents contatcs position with not-energized coil. So,
27-eletromechanical relay is represented by NC contact in the elementary diagram

27-digital relay needs a DC source to be ready for operation.
Without DC source relay contact is Normally Open(NO).
With DC source NC contact will be avaiable.

Question: How to represents 27 digital contact in-elementary diagram? (NC or NO ?)

dpc (Electrical)

12 Jul 12 11:32

We show it as N.O.(off-the-shelf), but we always provide a description of the contact operation (for ALL output contacts) in a legend on each drawings.

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