Answer / Shekher Singh Bharti

For numbering relay contacts, IEEE Standard 519-1993 recommends a sequential numbering starting from 1 and continuing until the last contact. If there are more than 99 contacts, use a second digit to represent the tens place (e.g., 101, 102, ..., 199, 201, ...). However, some manufacturers may have their specific numbering conventions. It is always best to refer to the relay manufacturer's documentation for detailed guidelines.

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