Here is Alabama's relevent section in their law. There doesn't appear to be any industrial exemption.
In most states an "industrial exemption" only exempts the engineer who works for the industrial company for in-house projects.
Here in this section it appears that Alabama exempts those working for public utilities and other government entities.
To answer your direct question, you need to simply go to each state's engineering board website where they post the governing laws and rules.
[blue]Section 34-11-14. Persons and acts exempt from chapter.
This chapter shall not be construed to prevent or to affect any of the following:
(1) The practice of any other legally recognized profession or trade.
(2) The work of an engineer intern or land surveyor intern, employee, or a subordinate of
any person holding a certificate of licensure under this chapter, or any employee of a
person practicing lawfully under paragraph b of subdivision (1) of Section 34-11-4, if the
work is done under the responsibility and supervision of a person holding a certificate of 18
licensure under this chapter or a person practicing lawfully under paragraph b of
subdivision (1) of Section 34-11-4.
(3) The practice of officers and employees of the government of the United States while
engaged within this state in the practice of engineering or land surveying for the
government. This exception does not extend to any engineer or land surveyor engaged
in the practice of professional engineering or land surveying whose compensation is
based in whole or in part on a fee.
(4) The practice of engineering or land surveying with respect to transportation or utility
facilities by any transportation company or public utility subject to regulation by the
Alabama Public Service Commission, the Federal Aviation Administration, the Federal
Communications Commission, the Federal Energy Regulatory Commission, or the
Nuclear Regulatory Commission, including its parents, affiliates, or subsidiaries; or by
the officers and employees of any transportation company or public utility including its
parents, affiliates, or subsidiaries. This exception shall not extend to any engineer or
land surveyor engaged in the practice of engineering or land surveying whose
compensation is based in whole or in part on a fee.
(5) The practice of engineering or land surveying by any person who is employed by the
Alabama Department of Transportation prior to January 1, 1997, in any engineering or
engineering assistant classification series under the State of Alabama Personnel Board,
merit system.
(6) The mere execution as a contractor of work designed by a professional engineer or
the supervision of the construction of such work as a foreman or superintendent.
(7) The performance of engineering services which are purely incidental to the practice
of architecture by registered architects, or their employees, or subordinates under their
responsible supervising control.
(8) The performance of engineering services which are purely incidental to the practice
of geology by registered geologists, their employees, or subordinates under their
responsible charge. [/blue]
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