Feeders
The conductor sizing and overcurrent protection requirements for feeders not over 1000V AC or 1500V DC are covered in this article
What is Article 215?
The unit load per square foot for a dwelling unit, which includes general-use receptacles and lighting outlets
What is 3 VA per square foot?
Article 230.85 requires this readily accessible disconnecting means to be located outdoors.
What is an emergency disconnect?
: Conductors for branch circuits that supply more than one receptacle for cord-and-plug-connected portable loads must have an ampacity of at least this
What is the rating of the branch circuit?
This new rule was added to the 2020 NEC to prevent an open equipment door from obstructing the entry or egress from a work area
What is the clearance rule for equipment doors?
The ampacity of feeder conductors that supply continuous loads must be at least this percentage of the continuous load, plus 100% of the noncontinuous load.
What is 125%?
used to calculate the floor area for load calculations
What are the outside dimensions of the building, dwelling unit, or other involved area?
The NEC permits additional services for different voltage systems or if capacity requirements exceed this amperage.
What is 2,000 amperes or more?
This type of protection was expanded in dwelling units by the 2020 NEC to require GFCI protection for 125-volt through 250-volt receptacles installed in specific locations [210.8(A)].
What is GFCI (Ground-Fault Circuit Interrupter) protection?
For a dwelling unit with a single household range rated 8.75 kW or more, this is the minimum calculated load in Table 220.55.
What is 8,000 watts?
The method of identifying different voltage systems must be permanently posted here.
What is at each feeder panelboard or similar distribution equipment?
spaces not to be included in the floor area calculation for a dwelling unit
What are open porches, garages, and unused or unfinished spaces not adaptable for future use?
the minimum vertical clearance for overhead service conductors (not over 300V to ground) above residential property and driveways.
What is 12 feet?
According to Section 210.8(A), GFCI protection is required for all 125-volt, single-phase, 15- and 20-ampere receptacles installed in these nine locations in dwelling units.
What are bathrooms, garages, outdoors, crawl spaces, basements, kitchens, wet bar sinks, laundry areas, and boathouses?
The maximum length of nonmetallic-sheathed cable that can be left unsupported from the cable entry to the first cable support is.
What is 12 inches?
Conductors of feeders using a common neutral must be in the same raceway/enclosure as per this section.
What is 300.20?
the rule for applying a continuous load multiplier to the unit loads found in Table 220.12
What is that the 125% multiplier for a continuous load is included in the Table 220.12 values and does not need to be separately applied?
The 2020 NEC requires that an outdoor emergency disconnect be installed for all new residential and dwelling unit services in an easily accessible location
[230.85] What is an outdoor service disconnect?
Section 210.52 was updated to include this new requirement for a receptacle outlet for dwelling units.
What is a receptacle outlet at a readily accessible outdoor location?
For an apartment building with 20 identical units of 840 square feet each, this is the general lighting and receptacle feeder calculated load for each unit after applying demand factors.
What is 3,520 VA?
This protection is not allowed for a feeder disconnect for a continuous industrial process if a non-orderly shutdown increases hazards.
What is ground-fault protection of equipment?
The table used to find the demand factors for household electric ranges, wall-mounted ovens, and counter-mounted cooking units in dwelling units.
What is Table 220.55?
Article 230 was updated to specifically prohibit the installation of a service disconnecting means in this location.
What is a bathroom?
according to Section 210.12, this kind of protection is required for all 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices located in kitchens, family rooms, dining rooms, and other similar areas.
What is Arc-Fault Circuit-Interrupter (AFCI) protection?
This classification of location is where ignitable concentrations of gases or vapors can exist under normal operating conditions
[500.5(B)]. What is a Class I, Division 1 location?