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Figure 1(a) illustrates the basic operation principle of light and overcurrent based protection. Optical fiber based point type and loop type sensors are commonly used in this application. The sensitivity level of the sensor is not a critical issue because the light intensity caused by an arc-flash is very high compared to ambient light intensity.

AN EXAMPLE OF A STANDARD ARC FLASH PPE LABELING STRATEGY 1.0 BACKGROUND INFORMATION: 1. The basis for the labeling of equipment for potential electric arc flash hazards is: ... reach a PPE level of 0, he/she would put on an appropriate cotton jacket, hearing protection (ear canal inserts), and leather gloves. ... Arc Flash PPE Labeling Strategy ...