We have calculated the ac losses of the one-phase HTS cable by using the EC model. By considering the applied filed generated by the layer currents, the Carr and Magnusson equations have been used for the calculation of WBa and WBc. The calculation and the measurement were equal with a transport current of 1 kArms. The winding pitches of the one-phase HTS cable have been adjusted to balance the layer currents. Comparing Bam and Bcm, Bcm values are dominant in the applied fields. The Bcm distribution of each layer has shown that Bcm has a peak at outermost layer in the conductor and moreover, Bcm in the electrical shielding is low compared with Bcm in the conductor. This tendency strongly influences the distribution of the layer losses in the conductor. In the electrical shielding, the layer losses consist of Wself and WBc.