Notice - Danger Secondary Power Source Connected Backup Generator Installed Sign They communicate information of a general nature and often refer to Housekeeping, Company Practices and Logistics. These signs are not referred in AS1319, however are available due to popular demand. Notice - Danger Secondary Power Source Connected Backup Generator Installed Sign They communicate information of a general nature and often refer to Housekeeping, Company Practices and Logistics. These signs are not referred in AS1319, however are available due to popular demand.