Suffolk County, New York requires a "restricted electrican" license for any work under 90 volts.
There is no enforcement of this requirement. Unlicensed contractors continue to work in a county that has a population of 1.5 million but only has two electrical licensing inspectors.
License requires 3 years' experience, and a written and practical test, or former Bell System, or derivative, experience and no test. Licensee must demonstrate liabilty insurance in the amount $500,000, naming the county as a co-insured party.
They seem to ignore the fact that -48 talk plus ~105 ringing = -153 volts.
No license is required if the contract is being performed for any government entity.