We have a client who supply products to a nationwide chain of retail outlets. They have a helpdesk for customers to call in with product queries / repairs, warranty claims etc.
They were experiencing power outages due to the building they were in experiencing power difficulties. As a solution we installed a UPS (uninterruptible power supply) with battery backup. We installed the phone system, and the server that hosts the helpdesk phone call queue management system to the UPS, so if there are any power outages / brown outs (low power supply) there is a battery back to run the phones until the power issue is resolved. We also set-up a PC for the alarm system, and the file server to a KVM switch so their own technical support (we trained their staff for some issues) can access the server, or the alarm system pc from using the same keyboard and mouse.