903A.7  Separate sentences.
  Consecutive multiple sentences that are within the same category under section 903A.2 shall be construed as one continuous sentence for purposes of calculating reductions of sentence for earned time. If a person is sentenced to serve sentences of both categories, category “B” sentences shall be served before category “A” sentences are served, and earned time accrued against the category “B” sentences shall not be used to reduce the category “A” sentences. If an inmate serving a category “A” sentence is sentenced to serve a category “B” sentence, the category “A” sentence shall be interrupted, and no further earned time shall accrue against that sentence until the category “B” sentence is completed.
83 Acts, ch 147, §8, 14; 97 Acts, ch 131, §3, 4; 98 Acts, ch 1100, §89; 2000 Acts, ch 1173, §8, 10