NEC 2026 Compatible
A 50 kVA, three-phase transformer is installed in a building. The primary voltage is 480V, and the secondary voltage is 208Y/120V. What is the minimum size of the primary feeder conductors, assuming 75°C terminals and continuous load, if the primary overcurrent protection is rated at 125% of the transformer's full-load current and the conductors are sized at 125% of the overcurrent device rating, as per NEC 210.19(A)(1)?
Master Level📋 NEC 210.19(A)(1), NEC 240.6(A), NEC Table 310.16Transformers
A
No. 6 AWG copper
B
No. 4 AWG copper
C
No. 3 AWG copper
D
No. 2 AWG copper
Explanation & Direct Citation
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