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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(Feet)     ALTITUDE(meters)    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