What is the derating factor for higher altitudes using Freedom contactors and starters?

 

 

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