Which NEC article covers transformers?

Which NEC article covers transformers?

• A. Article 430
• B. Article 480
• C. Article 450
• D. Article 800

Answer: (C)

This question tests knowing where the NEC assigns transformers. Transformers and transformer installations are covered in the article dedicated to transformers, which provides rules for the installation, including dry-type and liquid-immersed transformers, location and clearance, enclosure and ventilation, cooling methods, and insulation considerations. It also sets requirements for overcurrent protection, conductor sizing and termination, and grounding/bonding, as well as any special cases like transformer vaults used in certain installations. The other articles referenced govern motors and motor circuits, storage batteries, and communications systems, which do not address transformers.

This question tests knowing where the NEC assigns transformers. Transformers and transformer installations are covered in the article dedicated to transformers, which provides rules for the installation, including dry-type and liquid-immersed transformers, location and clearance, enclosure and ventilation, cooling methods, and insulation considerations. It also sets requirements for overcurrent protection, conductor sizing and termination, and grounding/bonding, as well as any special cases like transformer vaults used in certain installations. The other articles referenced govern motors and motor circuits, storage batteries, and communications systems, which do not address transformers.