What is the derating factor for higher altitudes using Freedom contactors and starters?
You can derated Freedom contactors and starters per the derating table below for OVER 1800 METERS 6,000 FEET
ALTITUDE(Meters) ALTITUDE(Feet) Voltage factor Current Factor
2500 8200 0.93 0.97
3000 9800 0.87 0.95
4000 13000 0.77 0.9
5000 16400 0.67 0.85
If Starter Is A Size 1 At 11,000 ft.Max. Voltage Starter Can See 660v.
600volts + 10%
For example Std. Size 1 27Amp.
For Volts .77 X 660 = 508.2 Max. Volts
For Current .9 X 27 = 24.3 Max. Current
At the new rating, this equipment is then
suitable for use on electrical system that
varies no more than +10%,-15% of the 480 volt rating
1 Meter = 3.281 Feet