Manual

30 — ElectriCalc LT
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 Display
Reset calculator [Set] [x] 0.
Set to 1-phase [Set] 1 1 PH
Set to 90°C [Set] 9 1Ø 90 Cu 1 PH
Toggle to alum. [CU/AL] 1Ø 90 Al 1 PH
Enter volt-amps 47650 [VA] 47,650. VA
Enter volts 240 [Volts] 240. VOLT
Set to 50°C amb 50 [Set] [2] AMB° 50
Find adjst wire sz. [WireSz] 300 AL
AWG WIRE SIZE
Find derated 8 [Set] [ParSz] 500 AL
wire size D/R 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] AMB° 30