210-11. Circuit Interconnection. Neutral and ungrounded
circuit conductors for two-, three- or four-wire circuits shall originate
at the same outlet or panel. Neutral and/or ungrounded conductors for circuits
shall not be tapped or spliced from different locations in the wiring system.
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230-40. Number of Service-Entrance Conductor Sets. Each
service drop or lateral shall supply only one set of service-entrance conductors.
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Exception No. 1: Buildings with more than one occupancy shall
be permitted to have one set of service-entrance conductors run to each occupancy
or to a group of occupancies.
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Exception No. 2: Where two to six service disconnecting means
in separate enclosures are grouped at one location and supply separate loads
from one service drop or lateral, one set of service-entrance conductors shall
be permitted to supply each of several such service equipment enclosures.
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Exception No. 3: Deleted.
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230-72. Grouping of Disconnects.
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(a)
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General. The two to six disconnects as permitted in Section 230-71 shall
be grouped. Each disconnect shall be marked to indicate the load served.
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Exception No. 1: one of the two to six service disconnecting means
permitted in Section 230-71, where used only for a water pump also intended
to provide fire protection, shall be permitted to be located remote from the
other disconnecting means.
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Exception No. 2.- A service disconnect(s) for separately metered
outdoor electric space conditioning equipment for one- and two-family dwellings
shall be permitted to be located immediately adjacent to the outdoor meter
cabinet. A permanent plaque or directory shall be installed at each service-disconnect
location denoting all other services, feeders and branch circuits supplying
that building or structure and the area served by each. The feeder or branch
circuit permitted by this exception shall not enter or pass through the structure
or building served.
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240-21. Location in circuit.
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(m)
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Outside Feeder Taps. Outside conductors shall be permitted to be tapped
to a feeder or to be connected at the transformer secondary, without overcurrent
protection at the tap or connection, where all the following conditions are
met:
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(1)
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The conductors are suitably protected from physical damage.
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(2)
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The conductors terminate at up to six circuit breakers or six circuit
breakers or six sets of fuses, that will limit the load to no more than 125%
of the ampacity of the conductors. The calculated load shall not exceed the
allowable ampacity of the conductors.
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(3)
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The tap conductors are installed outdoors, except at the point of termination.
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(4)
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The overcurrent device for the conductors is an integral part of a disconnecting
means or shall be located immediately adjacent thereto.
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(5)
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The disconnecting means for the conductors are installed at a readily
accessible location either outside of a building or structure or inside nearest
the point of entrance of the conductors.
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250-91. Material.
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(b)
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Types of Equipment Grounding Conductors. The equipment grounding conductor
run with or enclosing the circuit conductors shall be one or more or a combination
of the following: a copper or other corrosion-resistant conductor. This conductor
shall be solid or stranded; insulated, covered or bare; and in the form of
a wire or a busbar of any shape; (2) rigid metal conduit, (3) intermediate
metal conduit, (4) electrical metallic tubing; (5) armor of Type AC cable;
(6) the copper sheath of mineral-insulated, metal-sheathed cable; (7) the
metallic sheath or the combined metallic sheath and grounding conductors of
Type MC cable; (8) cable trays as permitted in Sections 318-3(c) and 318-7;
(9) cablebus framework as permitted in Section 365-2(a); (10) other electrically
continuous metal raceways listed for grounding.
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350-14. Grounding. Flexible metal conduit shall not be
permitted as a grounding means, Where an equipment bonding jumper is required
around flexible metal conduit, it shall be installed in accordance with Section
250-79.
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351-9. Grounding. Liquidtight flexible metal conduit shall
not be permitted as a grounding means. Where an equipment bonding jumper is
required around liquidtight flexible metal conduit, it shall be installed
in accordance with Section 250-79.
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336-5. Uses Not Permitted.
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(a)
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Types NM, NMC and NMS. Types NM, NMC and NMS cables shall not be used:
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(1)
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As service-entrance cable.
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(2)
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In commercial garages having hazardous (classified) locations as provided
in Section 511-3.
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(3)
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In theaters and similar locations, except as provided in Article 518,
Places of Assembly.
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(4)
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In motion-picture studios.
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(5)
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In storage battery rooms.
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(6)
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In hoistways.
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(7)
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Embedded in poured cement, concrete or aggregates.
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(8)
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In any hazardous (classified) location, except as permitted by Sections
501-4(b), Exception, 502-4(b), Exception, and 504-20.
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422-21(c). Space-heating equipment other than electric heat.
A readily accessible disconnect switch shall be mounted on the exterior of
the heating equipment or on a surface adjacent to the heating equipment.
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517-61. Wiring and Equipment.
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(a)
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Within Anesthetizing Locations.
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(1)
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Except as permitted in Section 517-160, each power circuit within, or
partially within, an anesthetizing location as referred to in Section 517-60
shall be isolated from any distribution system by the use of an isolated power
system.
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Exception: An area in a health-care facility which does not use
flammable inhalation anesthetics and is dedicated to brief, superficial procedures
carried out under inhalation anesthesia or analgesia, such as dental operatories,
clinics and outpatient facilities.
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760-16. Supervision. All fire-protective circuits shall
be electrically or electronically supervised so that any malfunction of the
system, such as an electrical open, a ground fault or any short circuit fault
on the main power supply, signaling line or alarm initiating devices, will
indicate a visual and audible signal at the alarm panel when proper alarm
operation would be prevented.
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Exception: Interconnecting circuits of household fire-warning
equipment that are wholly within a dwelling unit.
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