Install this product in a location with Overvoltage Category III and pollution degree 2 or less as specified in UL61800-5-1. Ambient Temperature Setting Maintain the ambient temperature within the following ranges according to the enclosure type. IP20/UL Type 1: -10 °C to +40 °C (14 °F to 104 °F) IP20/UL Open Type: -10 °C to +50 °C (14 °F to 122 °F)