Led Lighting Spd Design Installation Guide Page 4 LED Lighting SPD Design & Installation Guide

LED Lighting Surge Protection Modules Design and Installation Guide 2015 Littelfuse LED Lighting SPD Module Design and Installation Guide www.littelfuse.com Underground Line Transients Figure 2. Indirect lightning strikes can induce magnetic fields in overhead and underground power lines that produce over-voltage transient surges. The surges produced by electrical storms can adversely affect outdoor LED lighting installations. The luminaire (the combination of a module or a light engine with control gear to form a lighting system) is susceptible to damage both in the differential and common modes: Differential Mode - High voltage/current transients between the Line-Neutral (L-N) or Line-Line (L-L) terminals of the luminaire could damage components in the power supply unit or the LED module board. Common Mode - High voltage/current transients between the L-G (earth) or N-G (earth) terminals of the luminaire could damage safety insulation in the power supply unit or LED module board, including the LED to heat sink insulation. Based on site surveys and statistics on years of lightning strike data in the United States, the IEEE (Institute of Electrical and Electronics Engineers) recommends test criteria for induced surge waveforms and energy levels for indoor/outdoor locations (Category A/B/C). The IEEE recommendations were then referred to by ANSI (the American National Standards Institute) and the DOE (Department of Energy) when testing standards were established in the United States. Indirect Lightning-Induced Surge (continued) 4

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