Services & DistributionQuestion 112 of 521
Where multiple service disconnects are installed under the 2023 NEC, the general requirement (compared to older editions) is that they be:
a.Operable by a maximum of six movements of the hand in one enclosure
b.Installed in separate enclosures, or in a listed assembly, rather than up to six switches in a single common enclosure
c.Interlocked so only one can open at a time
d.Located outdoors only
Explanation
The 2023 NEC changed the multiple-disconnect rule so that up to six service disconnects must be in separate enclosures (or part of a listed switchboard, switchgear, or metering-disconnect assembly), rather than as several breakers in one common enclosure. The old six-hand-movement allowance in a single cabinet is no longer the general rule.
Law Reference: 2023 NEC §230.71Practice all 521 questions free — no signup required.
Related questions on this topic
- A detached garage is supplied by a feeder from the main dwelling. At the garage, the code generally requires:
- On a 4-wire delta system where the midpoint of one phase is grounded, the conductor with the higher voltage to ground (the high leg) must be durably and permanently marked, typically colored:
- A service raceway enters a building from an underground distribution system. To prevent moisture and gases from entering, the raceway must be:
- When installing a surge-protective device (SPD), the best practice for the connecting conductors is to:
- In a standard dwelling load calculation, the general lighting and receptacle load demand factor applies 100% to:
- A series-rated combination of overcurrent devices is permitted to protect equipment where the available fault current exceeds the interrupting rating of a downstream device, provided the combination is:
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-10 Electrical Trade Examination · How we review