This part of IEC 61788 covers a test method for determining the DC critical current of short and straight RE (rare earth)-Ba-Cu-O (REBCO) superconductors that have a shape of flat tape. The test specimen covered by this test procedure should be shorter than 300 mm and have a rectangular cross section with an area of 0,03 to 7,2 mm2, which corresponds to the tapes with width ranging from 1,0 to 12,0 mm and thickness from 0,03 to 0,6 mm. This method is intended for use with superconductors that have critical current less than 1000 A and n-values larger than 5 under standard test conditions: the test specimen is immersed in liquid nitrogen bath at ambient pressure without external magnetic field during the testing. Deviations from this test method that are allowed for routine tests and other specific restrictions are given in this standard.