givester
New User
- Location
- St. Louis, MO
- Occupation
- Commissioning Agent
In NFPA 110-2016, 7.13.4.1 is required to test transferring to the EPSS before the full load testing of the EPSS in 7.13.4.3.
7.13.4.3.1 - This full-load test shall be initiated after the test specified in 7.13.4.1.4 by any method that starts the prime mover and, upon reaching rated rpm, picks up not less than 30 percent of the nameplate kW rating for the first 30 minutes, not less than 50 percent of the nameplate kW rating for the next 30 minutes, and 100 percent of the nameplate kW rating for the next 60 minutes, less applicable derating factors for site conditions. Note: There is a difference between prime and standby ratings and there can be a significant difference when calculating 30% of nameplate. It is important to verify the rating before the test.
Is there a reason 7.13.4.1 tests are required before the 7.13.4.3 tests other than performing 7.13.4.1 first would require complete system installation prior to load banking? The reason I ask is that as a commissioning agent, I often see load bank testing of the generator to satisfy 7.13.4.3 happening at the site prior to the testing in 7.13.4.1 occurring. This load banking of the generator is usually before the building's emergency distribution system is ready to be energized.
Note requirement continues through 2025 version, however section numbers are altered.
7.13.4.3.1 - This full-load test shall be initiated after the test specified in 7.13.4.1.4 by any method that starts the prime mover and, upon reaching rated rpm, picks up not less than 30 percent of the nameplate kW rating for the first 30 minutes, not less than 50 percent of the nameplate kW rating for the next 30 minutes, and 100 percent of the nameplate kW rating for the next 60 minutes, less applicable derating factors for site conditions. Note: There is a difference between prime and standby ratings and there can be a significant difference when calculating 30% of nameplate. It is important to verify the rating before the test.
Is there a reason 7.13.4.1 tests are required before the 7.13.4.3 tests other than performing 7.13.4.1 first would require complete system installation prior to load banking? The reason I ask is that as a commissioning agent, I often see load bank testing of the generator to satisfy 7.13.4.3 happening at the site prior to the testing in 7.13.4.1 occurring. This load banking of the generator is usually before the building's emergency distribution system is ready to be energized.
Note requirement continues through 2025 version, however section numbers are altered.