Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 143, § 71F

Such license or temporary license shall not be required for the installation of signal systems, fans, telephones, electric light fixtures, illuminated thresholds and feed wires to the terminals on the elevator main line control, nor shall they apply to electrical work in connection with the interlocking devices, so called, on other than automatic elevators, if such installation is made by a person licensed under chapter one hundred and forty-one.