Prisma Plus LV Switchboards - POWERLAB

Thermal characteristicsSystem GThermal managementof switchboardsChartsCharacteristicsQuick calculation chartsfor internal temperaturesfor System GFor the enclosures not mentioned on the previouspages, use the equation:P∆T = -------------S × Kwhere:∆T: internal temperature - external temperatureP: power dissipated by the devices, connections andbusbars (in Watts)S: total free surface area of the enclosure(expressed in m 2 )K: thermal-conduction coefficient of the material(W/m 2 °C)K = 5.5 W/m 2 °C for painted sheet metal.DD382432DD382433IP3X wall-mount enclosureIP43 wall-mount enclosureTest conditions:600 mm wide enclosuremounted directly on wallwithout fixing lugs.Test conditions:600 mm wide enclosuremounted directly on wallwithout fixing lugs.Note: The dissipated power of each device is provided by themanufacturer. Add approximately 30% to account for theconnections and the busbars.The indicated internal heat rise is that measured at midheightin the enclosure.DD382434IP3X floor-standing enclosureTest conditions:600 mm wide enclosureon floor against a wall.DD382435IP43 floor-standing enclosureTest conditions:Mounted on wall withfixing lugs or onmounting uprights.DD382436IP55 wall-mount and floor-standing enclosuresTest conditions:600 mm wide enclosuremounted directly on wallwithout fixing lugs ormounting uprights.174