What is Article 690 NEC?
Article 690 does cover solar power systems, including those that are interactive with other power systems [690.1]. These do supply power to premises wiring. The NEC provides a simple diagram that clearly illustrates PV system components [Figure 690.1(a)].
How do Article 690 and other NEC articles apply to the planning and installation of a PV system?
Article 690, Part III, addresses disconnect requirements for PV systems. Disconnects are required for both the DC and AC sides of a PV system. Disconnects are also required to isolate other power sources, such as batteries, and may be included at additional points to facilitate system testing or maintenance.
What are the five types of PV systems covered in Article 690?
Though it covers solar power systems, Article 690 is not light reading. Article 690, consisting of eight Parts, applies to photovoltaic (PV) electrical energy systems, array circuit(s), inverter(s), and charge controller(s) for PV systems.
What is the minimum size grounding equipment conductor required for a photovoltaic system?
14 AWG
The equipment grounding conductors shall be no smaller than 14 AWG.” “Photovoltaic power systems with both alternating- current and direct-current (dc) grounding requirements shall be permitted to be grounded as described in (1) or (2):
Where do I put my solar labels?
Conduit bodies in which any of the available conduit openings are unused The labels or markings shall be visible after installation. Photovoltaic power circuit labels shall appear on every section of the wiring system that is separated by enclosures, walls, partitions, ceilings or floors.
Which NEC articles cover solar PV systems?
National Electrical Code Chapter 6 addresses special equipment and includes Article 690: “Solar Photovoltaic Systems.” Article 690 covers the wiring of the PV arrays as well as the installation of inverters and controllers.
Can I run PV wire in conduit?
Generally, either PV wire or USE-2 wire is used for the array, and is not run inside conduit. USE stands for “underground service entrance”. It’s not, however, restricted to subterranean applications. Both USE-2 and PV wire can handle high ambient heat.
What is the maximum voltage permitted for PV systems dc circuits on or in buildings?
1000 volts
PV system dc circuits on or in buildings shall be permitted to have a maximum voltage no greater than 1000 volts. PV system dc circuits on or in one- and two-family dwellings shall be permitted to have a maximum voltage no greater than 600 volts.
What is an ungrounded PV system?
An ungrounded PV array, as permitted, per 690.41(A)(4), is where neither of the dc conductors from the array is grounded, which is the most popular of all the array configurations in the U.S. today.
What labels are required on electrical panels?
Safety labels are used on electrical panels, connected equipment, and the surrounding areas to warn of potential hazards. These labels typically include a word of warning, symbol, and safety message with a more detailed description.
What is a stand alone PV system considered under NEC labeling requirements?
Any structure or building with a PV power system that is not connected to a utility service source and is a stand-alone system shall have a permanent plaque or directory installed on the exterior of the building or structure at a readily visible location acceptable to the authority having The plaque or directory shall …
What is photovoltaic circuit?
A PV source circuit is the circuit connecting a group of modules together and to the common connection point of the DC system. PV source circuits are usually a string of series-connected modules. For small systems, the PV power source is usually only one source circuit.