As long as the general contractor (B license) is responsible for 2 or more unrelated trades their employees are permitted to do the electrical wiring or almost any of the specialty trades. Their employees are NOT required to be certified either unlike electrical contractors (C10).
This has been my biggest gripe of the new certification requirements. General contractors, HVAC contractors and landscape contractors can install all of the wiring they want and their employees don’t have to be certified. If we are going to require certification it need to apply to all workers performing electrical work.