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(1) If after the pronouncement of a sentence but before the complete serving of the sentence the condemned has committed a new offence, the court shall add the unexpunged part of the sentence of the previous sentence to the sentence imposed under the new sentence in whole or in part. In this case the final penalty cannot exceed 30 years of imprisonment, and with regard to persons under the age of 18 and persons who have attained the age of 18 but have not attained the age of 21, who have not previously been convicted, 15 years of imprisonment.

(2) Cumulation of complementary penalties in the case of cumulation of sentences is carried out under the conditions of art. 84 paragraph (2).

(3) The final sentence in the case of cumulative sentences shall be higher than the sentence imposed for the newly committed offence and the unexpunged part of the penalty imposed by the previous court sentence.

(4) Where one of the sentences prescribes life imprisonment, the final sentence in the case of cumulative sentences shall be life imprisonment.