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Sizing temperature-adjusted derated wires – Calculated Industries 5060 User Manual

Page 46

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44 — ElectriCalc Pro

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.
Ambient temperature is 50°C. What is
the derated wire size required if eight
current-carrying THHN wires were in-
stalled in the raceway?

Steps

Keystrokes

Display

Clear calculator

o o

0.

Set to 1-phase

S 1

1 PH

Set to 90°C

S 9

1Ø 90 Cu 1 PH

Toggle to alum.

S 4

1Ø 90 Al 1 PH

Enter volt-amps

47650V VA 47,650.

Enter volts

240 U

VOLT 240.

Set to 50°C amb

50 S 2

AMB 50 °C

Find adjst wire sz.

w

AWG 300 AL

WIRE SIZE

Find derated

8 S P

D/R 500 AL

wire size

WIRE SIZE

Display Wire

P

D/R 114.0

Ampacity

AI AMB WIRE A

Display Adjustment

P

ADJ 57. %

Factor

AI AMB

Display NEC Table

P

NEC 310.15

NOTE: All Settings should be changed back
to default to avoid conflicts in answers
throughout the rest of this manual.

* NOTE: See “Settings” for a list of
Permanent Values/settings. Changing
these settings may affect your calculations.