NEC 2026 Compatible

Transformers must be readily accessible EXCEPT when installed:

Journeyman LevelšŸ“‹ NEC 450.13Transformers
Circuit Diagram
Single-Phase Transformer ā€” NEC 450.3 OCPD Primary 450.3(B) ā‰¤125% 480V Primary Neutral 120V 120V Secondary 240V SEC PNL 120/240V Turns Ratio 4:1 (480:120) OCPD Sizing ā€” NEC 450.3(B): Primary only protection (no secondary OCPD): Primary OCPD ā‰¤ 125% of primary FLA Primary + secondary protection: Primary ā‰¤ 250% | Secondary ā‰¤ 125% I_primary = kVA Ɨ 1000 / V_primary | I_secondary = kVA Ɨ 1000 / V_secondary
A

Outdoors

B

In a vault

C

In the open on walls, columns, or structures (dry-type, 600V or less, 50 kVA or less)

D

In a locked room

Explanation & Direct Citation

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