UL 248-19:2020 PDF Download

UL 248-19:2020 is a standard that specifically applies to fuses used in photovoltaic (PV) systems with a maximum voltage rating of 1500 Vdc. The purpose of these fuses is to provide protection for the photovoltaic strings or arrays and their associated wiring against overloads or short circuits. The standard emphasizes that the fuses should be used within their marked electrical ratings, which are determined based on the requirements of the Canadian Electrical Code in Canada, the Standard for Electrical Installations in Mexico, and the National Electrical Code (NEC) in the United States.

It is important to note that these photovoltaic fuses are not intended to protect downstream inverter components, such as capacitors, or guard against any discharge of capacitors back into the arrays. The standard focuses on the specific application of fuses within photovoltaic systems and provides guidelines and requirements to ensure their proper usage and functionality.