HS Code for Oil-filled transformer

HS code 8504.22 is utilized for the classification of liquid dielectric transformers with a power handling capacity exceeding 650 kVA but not exceeding 10,000 kVA. This code is part of Chapter 85, which covers electrical machinery and equipment. Heading 8504 specifically addresses electrical transformers, static converters, and inductors. The \"liquid dielectric\" designation refers to transformers where the core and windings are immersed in an insulating liquid, typically mineral oil, which serves both as an electrical insulator and a cooling medium. The sub-classification is strictly based on the rated power handling capacity, measured in kilovolt-amperes (kVA). These units are common in industrial power distribution and medium-voltage substations. The classification is determined by the technical specifications of the transformer at its continuous rated power, rather than its peak or intermittent capacity. Proper classification ensures compliance with energy efficiency standards and electrical safety regulations that vary by power bracket.

Products Included

• Oil-immersed distribution transformers
• Mineral oil-filled power transformers (650kVA-10,000kVA)
• Step-down transformers for industrial substations
• Pad-mounted liquid-filled transformers
• Ground-mounted oil-filled electrical units

Common Misclassification

The most frequent misclassifications involve the power capacity thresholds. HS code 8504.21 is often incorrectly used for units that actually exceed 650 kVA, while 8504.23 is mistakenly applied to units that do not exceed 10,000 kVA. Furthermore, dry-type transformers (which do not use liquid dielectric) are often confused with oil-filled units; dry-type transformers are classified under subheadings 8504.31 through 8504.34 depending on their kVA rating. It is critical to verify the cooling method (liquid vs. air/resin) and the exact kVA rating on the manufacturer's nameplate to avoid using the wrong code.

FAQ

What is the HS code for oil-filled transformer?

The HS code for a liquid dielectric (oil-filled) transformer with a capacity between 650 kVA and 10,000 kVA is 8504.22.

How do I distinguish between 8504.22 and 8504.33?

Code 8504.22 is specifically for liquid dielectric transformers, whereas 8504.33 is for other types of transformers (like dry-type) with a capacity between 16 kVA and 500 kVA.