Here in Connecticut, there is two "electrical" licenses’, E1 and E2
An E1 can do any form of electrical work; up to the power company connection point, an E2 can do the same, but only in the employ of an E1. Apprentices don't count as E2 till they have passed an exam.
There used to be an E-9 license here for Residential only, but that got phased out many years ago.
As far as low voltage, there is wayyyyy to many licenses’ [see below] phone only, low voltage upto x voltage, low voltage up to y voltage, kinda confusing, and sadly, those separation lines are crossed often.
Pulled fro State of Ct, Department of Consumer Protection
Dollar amounts are the yearly fee, not including newly required continuing education
"Electrical work" means the installation, erection, maintenance, alteration or repair of any wire, cable, conduit, busway, raceway, support, insulator, conductor, appliance, apparatus, fixture or equipment which generates, transforms, transmits or uses electrical energy for light, heat, power or other purposes.
E-1 Unlimited Electrical Contractor - $75.00
The holder of this license may do all electrical work as defined in section 20-330 of the General Statutes.
E-2 Unlimited Electrical Journeyperson - $45.00
The holder of this license may do the same work as an E-1 licensee, but only while in the employ of a contractor licensed for such work. OJT = 8000 hours RI = 576 hours
L-5 Limited Electrical Contractor - $75.00
The holder of this license may perform only work limited to ADT, similar or low voltage signal work, audio and sound systems. The installation or repair of any electrical work for plating or similar low voltage work is not authorized. The voltage of the system is not to exceed 25 volts or five amperes where such work commences at an outlet receptacle or connection previously installed by a person holding the proper electrical license.
L-6 Limited Electrical Journeyperson - $45.00
The holder of this license may perform the same work as the L-5 licensee, but only while in the employ of a contractor licensed for such work. OJT = 4000 hours RI = 288 hours
C-5 Limited Electrical Contractor - $75.00
The holder of this license may perform only work limited to ADT, similar or low voltage signal work, audio and sound systems, and telephone-interconnect systems. The installation, repair, maintenance of any electrical work for plating is not authorized. The voltage of any system is not to exceed forty-eight (48 ) volts or five (5) amperes where such work commences at an outlet receptacle or connection previously installed by a person holding the proper electrical license.
C-6 Limited Electrical Journeyperson - $45.00
The holder of this license may perform the same work as the C-5 licensee, but only while in the employ of a contractor licensed for such work. OJT = 4000 hours RI = 288 hours
T-1 Limited Electrical Contractor - $75.00
The holder of this license may perform only work limited to telephone-interconnect systems where such work commences at an outlet receptacle or connection previously installed by a person holding the proper electrical license.
T-2 Limited Electrical Journeyperson - $45.00
The holder of this license may perform the same work as the T-1 licensee, but only while in the employ of contractor licensed for such work.
Requirements for this exam: completion of a bona fide apprenticeship program or at least four years of equivalent experience and training or five years as a registered public service technician. OJT = 4000 hours RI = 288 hours
L-1 Limited Electrical Line Contractor - $75.00
The holder of this license may perform only work limited to line construction, including distribution systems, and their allied work, for public and private companies; installation,
maintenance repair of all high voltage cable splicing and pulling wire for all systems in excess of 2,400 volts; traffic signal and highway lighting installation, maintenance and repair.
L-2 Limited Electrical Line Journeyperson - $45.00
The holder of this license may perform the same work as an L-1 licensee, but only while in the employ of a contractor licensed for such work. OJT = 8000 hours RI = 576 hours
Elevator Installation, Repair & Maintenance Work Licenses: Licenses Expire annually: August 31st