1. (a) Questions of

   1. (1) Primary coverage and
   2. (2) Excess coverage are subject to the same rules and regulations as defined under Liability, Section 2155.
2. (b) Reference is made to Section 1760.5 of the Insurance Code, subparagraphs (b), (c) and (d) which remove from the operations of the Act, insurance for certain common carriers such as steamships, railroads and aircraft (other than public liability hazards).*

(Ins. C. 110.) No forms of policies having been submitted, the writing of nonadmitted insurance must be in conformity with the general rules and basic principles.