Part 2 of GB 5013 gives the test methods specified in all parts of GB 5013 but not included in GB/T 2951.
GB 5013.2-1997 history
2008GB/T 5013.2-2008 Rubber insulated cables of rated voltages up to and including450/750 V.Part 2: Test methods
1997GB 5013.2-1997 Rubber insulated cables of rated voltages up to and including 450/750V. Part 2: Test methods
GB 5013.2-1997 Rubber insulated cables of rated voltages up to and including 450/750V. Part 2: Test methods was changed to GB/T 5013.2-2008 Rubber insulated cables of rated voltages up to and including450/750 V.Part 2: Test methods.