UL 1699B:2018 Photovoltaic (PV) DC Arc-Fault Circuit Protection.
1.1 These requirements cover DC photovoltaic arc-fault circuit protection devices intended for use in solar
photovoltaic electrical energy systems as described in Article 690 of the National Electrical Code, NFPA
70. This protection is intended to mitigate the effects of arcing faults that may pose a risk of fire ignition
under certain conditions if the arcing persists.
1.2 These requirements cover devices including photovoltaic (PV) dc arc-fault circuit-interrupters (AFCI), arc-fault detectors (AFD), interrupting devices (ID) and inverters, converters, and charge controllers with integral arc-fault circuit-interrupter protection.
1.3 These requirements cover devices rated 1500 volts or less. They are intended for use in dc electrical systems that are supplied by a photovoltaic source, such as a module with solar cells designed to generate dc power when exposed to sunlight.
1.4 These devices are not intended to detect glowing connections.
1.5 In Part 1 of these requirements the term “device” is used generically to apply to all of the devices
covered by these requirements and is modified when the requirement does not apply to all types. In Part
2 and Part 3 of these requirements the term “device” is used generically to apply to all devices covered
by the particular part of this Standard, and is modified when the requirement does not apply to all types.
1.6 A device that is also intended to perform other functions, such as overcurrent protection, disconnects, combiner boxes, inverters, or other PV system functions or any combination thereof, shall additionally comply with the requirements of the applicable Standard or Standards that cover devices that provide those functions as intended for use in PV systems.
2.1 For the purposes of this standard the following definitions apply.
2.2 ANNUNCIATOR — A feature of a device that gives an indication upon the functioning of a protective device.
2.3 ARCING — A luminous discharge of electricity across an insulating medium, usually accompanied by the partial volatilization of the electrodes.
2.4 ARCING FAULT — An unintentional arcing condition in a circuit.
2.5 CELL — The basic photovoltaic device that generates electricity when exposed to sunlight.
2.6 CHARGE CONTROLLER — A device intended to control the charging process of storage batteries used in photovoltaic power systems.UL 1699B pdf download.