Iowa Admin. Code r. 661-502.6
A political subdivision may disallow or limit the use of a class B license to perform electrical work within the geographic limits of that subdivision through adoption of a local ordinance. A copy of any such ordinance is to be filed with the board office prior to the effective date of the ordinance. If a class B license holder held a license issued or recognized by a political subdivision on December 31, 2007, that political subdivision cannot restrict the license holder from performing work which would have been permitted under the terms of the license issued or recognized by the political subdivision.
EXCEPTION: An ordinance restricting or disallowing electrical work by holders of class B licenses will not apply to work which is not subject to the issuance of permits by the political subdivision.
Iowa Admin. Code r. 661-502.6