General
What does NEC require when conductors 4 AWG or larger enter a cabinet, box, raceway or enclosure?
What is a bushing?
NEC 2020 300.4(G)
In dwelling unit garages, all 125‑V through 250‑V receptacles rated 50 A or less must have what type of protection?
What is GFCI protection for personnel?
NEC 210.8(A)
In dwelling unit habitable rooms, what is the general spacing requirement for wall receptacles?
What is 6 ft from a receptacle (12 ft between receptacles), and within 6 ft of door openings.
NEC 2020 210.52(A)
in other than one and two family dwellings the service disconnecting means must be clearly marked to indicate what specific information?
What is the source that supplies the circuit disconnecting means?
NEC 2020 110.22(A)
Where are acceptable grounding electrode types (rods, plates, CEE, water pipe, etc.) listed?
What is 250.52(A)?
NEC 2020
In which article would you find the requirement for a Type 1 or Type 2 SPD at dwelling unit services?
What is 230.67?
NEC 2020
For outdoor receptacles at one‑ and two‑family dwellings rated up to 50 A, what type of protection is required?
What is GFCI protection?
NEC 2020 210.8(A)
In dwelling kitchens, at least how many 20‑A small‑appliance branch circuits are required to serve countertop and wall receptacles?
What is (2) 20a small appliance circuits?
NEC 2020 210.52(B)(3) 210.11(C)(1)
Where are optional dwelling unit service and feeder load calculations located?
What is 220.82?
NEC 2020
Where are rules for bonding of metal water piping systems located?
What is 250.104(A)?
NEC 2020
A vending machine in a commercial building connected by a 125‑V cord and plug must have this protection, even if not in a damp location.
What is GFCI protection?
NEC 2020 422.5(A) and 422.5(B)(4)?
If I am adding a new receptacle and 4' of wire do I need to add AFCI protection?
What is yes?
NEC 2020 210.12(D)
What is the maximum allowed voltage between conductors for branch circuits supplying luminaires in dwelling units?
what is 120v nominal?
NEC 2020 210.6(A)(1)
In general, what is the maximum number of disconnects permitted for a single service to a building or structure?
What is six service disconnects?
NEC 2020 230.71(B)
For a 400‑A, single‑phase dwelling service with metal underground water pipe and ground rods, what is the minimum copper grounding electrode conductor to the water pipe?
What is 1/0 AWG Copper?
NEC 2020 250.66
What is the minimum working space depth in front of 601 V or greater equipment where there are exposed live parts on one side and grounded parts on the other?
What is 4 feet?
NEC 2020 110.26(A)(1) Condition 2
The 2020 NEC added GFCI requirements for which household appliances?
A luminaire that weighs more than what value, or exceeds 16 in. in any dimension, shall not be supported by a lampholder screw shell?
What is 6 pounds?
NEC 2020 410.30(A)
What is the minimum size aluminum feeder conductor allowed for a 100‑A feeder using 75°C terminations?
What is #1 AWG Aluminum?
NEC 2020 310.16
Where are bonding requirements for pool and spa equipotential bonding grids located?
What is 680.26?
NEC 2020
Only what type of outlet loads may be supplied by branch circuits over 50 amperes?
What is non-lighting outlet loads?
NEC 210.23(D)
EV Charging outlets installed inside of a garage requires GFCI protection?
What is No?
NEC 210.8(A)
Receptacles in damp or wet locations must have what type of cover when in wet locations and in use?
What is Weatherproof “in‑use”?
(extra‑duty for 15‑ and 20‑A, 125‑ and 250‑V in wet locations)
NEC 2020 406.9(B)(1)
Where can you find the list of standard ampere ratings for overcurrent devices?
What is 240.6?
A building steel electrode qualifies as an in‑ground support structure; to be recognized, it must have at least this minimum contact with earth, similar to other electrode types.
What is at least 10 ft of contact with earth for metal underground water pipe, and similar continuous contact for in‑ground structural steel?
NEC 2020 250.52(A)(1) and (A)(2)