What Type Of Ballasts Offer Built-in Thermal Protection?
What Type Of Ballasts Offer Built-in Thermal Protection? Ballasts provided with built-in thermal protection are listed by UL as Class P ballasts. Under normal conditions, the Class P ballast has a case temperature not exceeding 194°F (90°C). The thermal protector must open within 2 hours when the case temperature reaches 230°F (110°C). What is a