If a building has an electrical generator for power outages, one of the most valuable commissioning tests will be the loss of power response (LOPR) test, also known as a pull-the-plug test. This is one of the last tests performed on a project and is a perfect example of an integrated systems test.
Despite the name, the LOPR test is more than just an electrical test. It involves all systems connected to the generator power supply, including life safety, lighting, security, HVAC, process equipment, computer rooms, etc. Electrical testing only can confirm the generator starts when utility power is lost and transfers power through one or more automatic transfer switches (ATSs) in a timely fashion. It can also confirm that electrical distribution from the main service properly returns to normal when utility power is restored.