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Sizing Temperature-Adjusted
Derated Wires
A circuit was built with 90°C aluminum
wire connecting a 47,650 volt-amp load
to a 240 volt, single-phase source. Am-
bient temperature is 50°C. What is the
derated wire size required if eight cur-
rent-carrying THHN wires were installed
in the raceway?
Steps
Keystrokes
Reset calculator [Set] [x]
Set to 1-phase
[Set] 1
Set to 90°C
[Set] 9
Toggle to alum.
[CU/AL]
Enter volt-amps
47650 [VA]
Enter volts
240 [Volts]
Set to 50°C amb 50 [Set] [2]
Find adjst wire sz. [WireSz]
Find derated
8 [Set] [ParSz]
wire size
NOTE: Ambient temperature should be
changed back to 30°C to avoid conflicts
in answers through out the rest of this
manual.
Reset to 30°C
30 [Set] [2]
30 — ElectriCalc LT
Display
0.
1 PH
1Ø 90 Cu 1 PH
1Ø 90 Al 1 PH
47,650. VA
240. VOLT
Û &
AMB° 50
300 AL
AWG WIRE SIZE
500 AL
D/R WIRE SIZE
Û &
AMB° 30
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