A Trial to Test for Bioequivalence Between NN1045 and NN5401 in Subjects With Type 1 Diabetes

Inclusion Criteria: * Type 1 diabetes mellitus (as diagnosed clinically) for 12 months or longer * Body mass index from 18.0 to 28.0 kg/m\^2 (both inclusive) * HbA1c below or equal to 9.5% by central laboratory analysis Exclusion Criteria: * Subject who has donated any blood or plasma in the past month or more than 500 mL within 3 months prior to screening * Smoker (defined as a subject who is smoking more than 5 cigarettes or the equivalent per day) * Not able or willing to refrain from smoking and use of nicotine gum or transdermal nicotine patches during the inpatient period