Services & DistributionQuestion 80 of 521
Under the 2023 NEC, the service supplying a dwelling unit must be provided with a:
a.GFCI at the service
b.Surge-protective device (SPD)
c.AFCI at the service
d.Second grounding electrode only
Explanation
Section 230.67 (new emphasis in recent editions) requires dwelling unit services to be provided with a surge-protective device, located within or adjacent to the service equipment. GFCI and AFCI protection are branch-circuit requirements, not a service-level SPD substitute.
Law Reference: 2023 NEC §230.67Practice all 521 questions free — no signup required.
Related questions on this topic
- For a 200 A single-phase dwelling service, the minimum aluminum service-entrance conductor permitted by the dwelling service conductor provisions is:
- Each panelboard must be protected by an overcurrent device having a rating:
- Under the 2023 NEC, the maximum number of overcurrent devices permitted in a lighting and appliance branch-circuit panelboard is:
- Which type of surge-protective device is permitted to be connected on the line side of the service overcurrent device (service disconnect)?
- A concrete-encased electrode (Ufer) must consist of at least 20 ft (6.0 m) of:
- A single made rod electrode is measured at 40 ohms resistance to earth. The code requires that it be:
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-10 Electrical Trade Examination · How we review