SOLVED: Assignment 3: Cable Ampacity Calculations for Underground ConductorsTo illustrate the use of the method described in this chapter, a 3 x 5 duct bank system (3 rows, 5 columns) is considered. The duct bank contains 350 kcmil and 500 kcmil 15 kV 3/C copper cables. Ducts are a diameter of 5 inches, trade size of PVC, and are separated by 7.5 inches center-to-center spacing, as shown in Figure 13-3. The soil thermal resistivity (RHO) is 120°C-cm/W and the maximum soil ambient temperature is
SOLVED: Assignment 3: Cable Ampacity Calculations for Underg…
Dec 5, 2023
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When you have more than 3 current-carrying conductors in a raceway or cable, ampacity must be adjusted per NEC 310.15(C)(1). 👉 7–9 conductors = 70% 👉 Example: 40A × 70% = 28A Don’t forget this on exams and real installs — conductor bundling reduces heat dissipation.#electriciansoftiktok #JourneymanElectrician #JourneymanPrep #NEC #ElectricalTraining
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