Shuttle Avionics Integration Laboratory grounding system evaluation test

The Shuttle Avionics Integration Laboratory, a test bed that simulates Shuttle orbiter systems, was designed with an isolated single-point earth grounding system. A new single power transformer dedicated to the lab area was installed to replace the three existing transformers. This new hardware installation conflicts with the lab´s ground isolation requirements but conforms to the National Electrical Code, 1990 edition. A test was conducted to verify that the new single-point, nonisolated lab grounding scheme does not produce an unacceptable electromagnetic environment when compared with the original single-point, isolated grounding scheme