Lightning protection is covered by 3 main bodies each with their own standard.
UL - UL96a for Installation of Lightning Protection Systems
UL - UL96 Lightning Protection materials standard
UL does not certify designers, they certify manufacturers and installers.
UL offers certification for complete lightning protection systems in the form of a UL Master Label following a successful inspection.
NFPA - NFPA780 for the Installation of Lightning Protection Systems
Lightning Protection Institute - LPI175 Lightning Protection Institute Standard of Practice
LPI offers members testing and certification as Journeyman, Master Installer or Master Installer/Designer. Professionals can be tested and certified as a Designer Inspector.
LPI offers certification for complete lightning protection systems holding a UL Master Label.
Lightning Protection Systems usually falls under section 16670 in the electrical division but not always, it can also be found under special systems 13100.
Lightning protection systems are often designed to one or more of the nationally recognized standards as required per the project specifications. The design is based on the theories and calculations set by those standards as a minimum. Installation drawings are generated by a variety of sources, some Dealer/Contractors have a design department and some Manufacturers have their own design department that works directly with Dealer/Contractors. Architects and Engineers also design systems.
In the lightning protection industry you have the good, the bad and the ugly just like every other industry. All you can do make sure you are working with a certified Dealer/Contractor, Installer that have tested and certified staff and utilize listed and label materials. When I design a lightning protection system I follow the standards for the minimum and beyond if needed to meet the customer's needs and request.