In NJ homeowners can do their own electrical work on the property in which they live. An income property needs an EC to do the work. That said, there is a laundry list of stuff you don't need a permit for. Most minor repairs or "ordinary maintenance" is exempted. I can change outlets, switches, and fixtures without a permit as long as I'm not pulling new wire.
From NJ:
3. Ordinary electrical maintenance shall include:
i. The replacement of any receptacle, switch, or lighting fixture rated at 20 amps or less and
operating at less than 150 volts to ground with a like or similar item, including receptacles in
locations where ground-fault circuit interrupter protection, damp/wet or tamper-resistant are
required (Sections 210.8, 406.8 and 406.11, respectively, of the electrical subcode);
ii. Repairs to any installed electrically operated equipment such as doorbells, communication
systems, and any motor operated device. Provided, however, that if fire protection systems are
interrupted for repairs the fire official shall be notified in accordance with the building subcode;
iii. Installation of communications wiring for communications wiring in a Class 3 structure, provided
that the rearrangement does not involve penetration of a fire-rated assembly and is not in a
hazardous location as defined in Chapter 5 of the electrical subcode;
(1) For the purposes of applying these provisions, communications wiring shall mean any wiring
covered by Chapter 8 of the electrical subcode, such as telephone, radio antenna, or coaxial
cable TV wiring. Communications wiring shall also include data circuits between
computers/information technology equipment, which may be classified as "communications
circuits," in accordance with Article 725 of the electrical subcode; and
iv. Replacement of domestic dishwashers; and
v. Replacement of kitchen range hoods in single family dwellings.