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ChallengerPlus Installation and Quick Programming Manual
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Appendix C: Operating temperature
The operating ambient (room) temperature for the Challenger is 0 to 50°C.
If the Challenger is to operate for prolonged periods in an environment with an
ambient temperature above 40°C, de-rate the user current drawn from the NAC
according to the chart in Figure 15 below.
Figure 15: Power derating chart