13.8.1-1 Built-In Test Capabilities

All test capabilities for a unit of equipment should be built in, to the extent feasible, to reduce the likelihood of testing errors.

Additional Information:
Built-in test capabilities can avoid errors associated with disassembling plant equipment or connecting test equipment. The handling involved with removing and transporting a component to a test site may introduce new faults in sensitive equipment. Built-in diagnostics and testing features allow equipment to be tested in place. If it is not practical or possible to incorporate all test equipment, then test jacks may be provided to allow internal components to be tested by external test devices without disassembling the plant equipment.