We are running 3 wires in an IMC to a control panel with a 150 amp circuit breaker disconnect in the control panel. The conduit is run 12 inches above the roof on a strut rack. The ambient air temperature is 88 degrees. This control panel feeds the #1 cooling fan. What sized ungrounded conductors do we need? All conductors have typeTHHN insulation.

We are running 3 wires in an IMC to a control panel with a 150 amp circuit breaker disconnect in the control panel. The conduit is run 12 inches above the roof on a strut rack. The ambient air temperature is 88 degrees. This control panel feeds the #1 cooling fan. What sized ungrounded conductors do we need? All conductors have typeTHHN insulation.

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter27: Service-entrance Equipment

Section: Chapter Questions

Problem 17R

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QUESTION 8

We are running 3 wires in an IMC to a control panel with a 150 amp circuit breaker disconnect in the control panel. The conduit is run 12 inches above the roof on a strut rack. The ambient air temperature is 88 degrees. This control panel feeds the #1 cooling fan. What sized ungrounded conductors do we need? All conductors have typeTHHN insulation.

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