Below are some sections of the NEC relevant to our applications (click the links, the text is just a description of the content)
NEC 690 - Solar Photovoltaic Systems
690.1 Scope. This article applies to solar PV systems, other
than those covered by Article 691, including the array
circuit(s), inverter(s), and controller(s) for such systems. [See
Figure 690.1(a) and Figure 690.1(b).] The systems covered by this
article may be interactive with other electrical power produc‐
tion sources or stand-alone or both, and may or may not be
connected to energy storage systems such as batteries. These
PV systems may have ac or dc output for utilization.
NEC 240 - Overcurrent Protection
240.1 Scope. Parts I through VII of this article provide the
general requirements for overcurrent protection and overcur‐
rent protective devices not more than 1000 volts, nominal.
Part VIII covers overcurrent protection for those portions of
supervised industrial installations operating at voltages of not
more than 1000 volts, nominal. Part IX covers overcurrent
protection over 1000 volts, nominal.
NEC 250 - Grounding and Bonding
250.1 Scope. This article covers general requirements for
grounding and bonding of electrical installations, and the
specific requirements in (1) through (6).
(1) Systems, circuits, and equipment required, permitted, or
not permitted to be grounded
(2) Circuit conductor to be grounded on grounded systems
(3) Location of grounding connections
(4) Types and sizes of grounding and bonding conductors
and electrodes
(5) Methods of grounding and bonding
(6) Conditions under which guards, isolation, or insulation
may be substituted for grounding
NEC 310 - Conductors for General Wiring
Part I. General310.1 Scope. This article covers general requirements for
conductors and their type designations, insulations, markings,
mechanical strengths, ampacity ratings, and uses. These
requirements do not apply to conductors that form an integral
part of equipment, such as motors, motor controllers, and similar
equipment, or to conductors specifically provided for else‐where in this Code.
NEC 551 - Recreational Vehicles
551.1 Scope. The provisions of this article cover the electrical
conductors and equipment other than low-voltage and automo‐
tive vehicle circuits or extensions thereof, installed within or on
recreational vehicles, the conductors that connect recreational
vehicles to a supply of electricity, and the installation of equip‐
ment and devices related to electrical installations within a
recreational vehicle park.
NEC 712 & 720 - DC Microgrids and Low Voltages Circuits
712.1 Scope. This article applies to direct current microgrids.
Direct Current Microgrid (DC Microgrid). A direct current
microgrid is a power distribution system consisting of more
than one interconnected dc power source, supplying dc-
dc converter(s), dc load(s), and/or ac load(s) powered by dc-
ac inverter(s). A dc microgrid is typically not directly
connected to an ac primary source of electricity, but some dc
microgrids interconnect via one or more dc-ac bidirectional
converters or dc–ac inverters.
720.1 Scope. This article covers installations operating at less
than 50 volts, direct current or alternating current.
Full Code can be viewed here (signup required)
NEC 690 - Solar Photovoltaic Systems
690.1 Scope. This article applies to solar PV systems, other
than those covered by Article 691, including the array
circuit(s), inverter(s), and controller(s) for such systems. [See
Figure 690.1(a) and Figure 690.1(b).] The systems covered by this
article may be interactive with other electrical power produc‐
tion sources or stand-alone or both, and may or may not be
connected to energy storage systems such as batteries. These
PV systems may have ac or dc output for utilization.
NEC 240 - Overcurrent Protection
240.1 Scope. Parts I through VII of this article provide the
general requirements for overcurrent protection and overcur‐
rent protective devices not more than 1000 volts, nominal.
Part VIII covers overcurrent protection for those portions of
supervised industrial installations operating at voltages of not
more than 1000 volts, nominal. Part IX covers overcurrent
protection over 1000 volts, nominal.
NEC 250 - Grounding and Bonding
250.1 Scope. This article covers general requirements for
grounding and bonding of electrical installations, and the
specific requirements in (1) through (6).
(1) Systems, circuits, and equipment required, permitted, or
not permitted to be grounded
(2) Circuit conductor to be grounded on grounded systems
(3) Location of grounding connections
(4) Types and sizes of grounding and bonding conductors
and electrodes
(5) Methods of grounding and bonding
(6) Conditions under which guards, isolation, or insulation
may be substituted for grounding
NEC 310 - Conductors for General Wiring
Part I. General310.1 Scope. This article covers general requirements for
conductors and their type designations, insulations, markings,
mechanical strengths, ampacity ratings, and uses. These
requirements do not apply to conductors that form an integral
part of equipment, such as motors, motor controllers, and similar
equipment, or to conductors specifically provided for else‐where in this Code.
NEC 551 - Recreational Vehicles
551.1 Scope. The provisions of this article cover the electrical
conductors and equipment other than low-voltage and automo‐
tive vehicle circuits or extensions thereof, installed within or on
recreational vehicles, the conductors that connect recreational
vehicles to a supply of electricity, and the installation of equip‐
ment and devices related to electrical installations within a
recreational vehicle park.
NEC 712 & 720 - DC Microgrids and Low Voltages Circuits
712.1 Scope. This article applies to direct current microgrids.
Direct Current Microgrid (DC Microgrid). A direct current
microgrid is a power distribution system consisting of more
than one interconnected dc power source, supplying dc-
dc converter(s), dc load(s), and/or ac load(s) powered by dc-
ac inverter(s). A dc microgrid is typically not directly
connected to an ac primary source of electricity, but some dc
microgrids interconnect via one or more dc-ac bidirectional
converters or dc–ac inverters.
720.1 Scope. This article covers installations operating at less
than 50 volts, direct current or alternating current.
Full Code can be viewed here (signup required)
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