When entering your NNC number in the receiver's database, you can enter up to 8 digits. If the account number in the panel is longer than 8 digits, the receiver will identify that panel by the last 8 digits of the account number only. For example, a panel with account number 1234567890 will use an NNC number of 34567890. If you are using less than 8 digits for your panel's account number, then the NNC number will use the full account number. For example, account number 1234 in the panel would use an NNC number of 1234 in the receiver's account database.