166 Technical data Altitude deratingIn altitudes 1000…4000 m (3300…13120 ft) above sea level, the derating is 1% forevery 100 m (330 ft).The output current is calculated by multiplying the current given in the rating table bythe derating factor k, which for x meters (1000 m <= x <= 4000 m) is:Altitude and ambient temperatureIf ambient temperature is below 40 °C (+104 °F), the derating can be reduced by1.5% for every 1 °C (1.8 °F) reduction in temperature. A few altitude derating curvesare shown below. For a more accurate derating, use the DriveSize dimensioning PCtool.Derating factor 1.00Derating factor 0.95Derating factor 0.9Derating factor 0.85Derating factor 0.80k = 1 - 110 000 m. (x - 1000) m1500 m1000 m+25 °C +30 °C+77 °F +86 °F+40 °C+104 °F+35 °C+95 °F+20 °C+68 °F3300 ft4921 ft2000 m6562 ft2500 m8202 ft3000 m9842 ft3500 m11429 ft4000 m13123 ftInstallation site altitude1.000.950.850.900.80Ambient temperature
