UL 1699B:2021 PDF Download

UL 1699B:2021 is a standard that outlines the requirements for DC photovoltaic arc-fault circuit protection devices. These devices are specifically designed for use in solar photovoltaic electrical energy systems, as described in Article 690 of the National Electrical Code (NFPA 70). The purpose of these protection devices is to mitigate the risks associated with arcing faults in these systems that could potentially lead to fire ignition.

The standard covers a range of devices, including photovoltaic (PV) DC arc-fault circuit-interrupters (AFCIs), arc-fault detectors (AFDs), interrupting devices (IDs), and inverters, converters, and charge controllers with integral arc-fault circuit-interrupter protection. It is important to note that these devices are intended for systems rated 1500 volts or less that are supplied by a photovoltaic source, such as solar cells generating DC power.

However, it's worth mentioning that these devices are not designed to detect glowing connections. The term "device" is used generically throughout the standard, but it may be modified when certain requirements apply to specific types of devices. Additionally, if a device is intended to perform other functions, such as overcurrent protection or disconnects, it must also comply with the relevant standards for those specific functions in PV systems.