Dry-type transformer product attributes

Low-voltage dry-type transformers are chosen on a small set of ratings, kVA, phase, primary and secondary voltage, but the values that decide whether a unit suits the installation are often further down the datasheet. Impedance affects available fault current and voltage regulation downstream. Temperature rise and K-factor affect how the unit tolerates load and harmonics. Taps determine whether the output can be adjusted for a low or high supply voltage.

Supplier files write voltages several ways, for example 208Y/120, 120/208 and 208 wye, and these must be normalized before records can be compared. Efficiency compliance is often shown as a yes or no flag even though the federal rules define scope, efficiency levels and compliance dates, and some transformer types are excluded. Domestic content status is increasingly requested for public projects and is rarely in the file.

This template separates electrical ratings, construction, performance values and compliance evidence, so buyers can compare units like for like and quote desks can answer project specification questions. Each value should be traceable to the manufacturer's nameplate data, datasheet or test report, and regulatory status should be confirmed against current documentation.

The dry-type transformers attribute template

18 candidate fields in 5 groups, ordered the way a record gets built: identify the item, capture its specifications, then record fit and the evidence behind any claim. 9 are marked Core: without them the item cannot be identified or filtered. Example values show the expected format only; they do not describe a real SKU.

Identity

Which exact item, variant and pack this record describes.

Check before use: Preserve leading zeros and punctuation, validate against the manufacturer record, and check the GTIN check digit and packaging level before linking.

Attribute	Type	Priority	Example format
Manufacturer Part Number manufacturer_part_number	Identifier	Core	DT3-112-480D-208Y-150
GTIN / UPC gtin_upc	Identifier	Channel / evidence	081234112509

Technical specifications

Measured or rated values that must travel with their unit and test conditions.

Check before use: Store the number and unit separately. Convert only when the source unit and test conditions are known.

Attribute	Type	Priority	Example format
kVA Rating kva_rating	Number · kVA	Core	112.5
Primary Voltage primary_voltage	Controlled list · V	Core	480 V Delta
Secondary Voltage secondary_voltage	Controlled list · V	Core	208Y/120 V
Temperature Rise temperature_rise	Controlled list · °C	Core	150 °C
Enclosure / NEMA Rating enclosure_nema_rating	Controlled list	Core	NEMA 3R
Impedance (%Z) impedance_z	Number · %	Buyer decision	4.0
Sound Level sound_level	Number · dB(A)	Buyer decision	45
K-Factor Rating k_factor_rating	Controlled list	Buyer decision	K-13

Selection attributes

The type, material and option choices buyers filter and compare on.

Check before use: Map supplier wording to a governed vocabulary only after checking the source text and which variant it applies to.

Attribute	Type	Priority	Example format
Phase phase	Controlled list	Core	Three-phase
Construction Class construction_class	Controlled list	Core	Ventilated
Primary Taps primary_taps	Text	Buyer decision	6 x 2.5% (2 FCAN, 4 FCBN)
Electrostatic Shield electrostatic_shield	Controlled list	Buyer decision	Yes

Fit & compatibility

What the item mounts to, mates with, replaces or works alongside.

Check before use: Keep model and series qualifiers. A similar-looking part is not a verified fit until a source says so.

Attribute	Type	Priority	Example format
Mounting mounting	Controlled list	Core	Floor

Evidence & compliance

Listings, standards, classifications and origin claims that need a document behind them.

Check before use: Link the manufacturer document or label with its edition or date. Never copy a certification from a neighboring SKU.

Attribute	Type	Priority	Example format
DOE Efficiency Status doe_efficiency_status	Text	Channel / evidence	Declared compliant with 10 CFR 431 efficiency levels in effect at manufacture
UL 1561 Listing ul_1561_listing	Controlled list	Channel / evidence	UL 1561 Listed
Country of Origin country_of_origin	Controlled list	Channel / evidence	Mexico

Normalize supplier values

The same value arrives in many spellings. Map each raw string to one governed value, and keep the raw text beside it so a reviewer can see what the supplier actually wrote.

Often missing from supplier files

These fields are commonly absent from price lists and basic feeds, even though the information usually exists in a datasheet, label or installation manual. Treat an empty value as a request for evidence, not as permission to fill it from a similar model.

• Impedance (%Z)
• DOE Efficiency Status (scope + vintage)
• BABA / Domestic Content Status
• Sound Level (dB(A))
• Primary Taps

Questions the record must answer

Buyers and counter-sales reps choosing dry-type transformers ask questions like these. Each one needs a specific field, sourced for the exact variant.

• Can this transformer take 480 V delta down to 208Y/120 V for our panel?
• What is the impedance, so we can work out fault current on the secondary side?
• Is it built for harmonic loads from computers and variable-speed drives?
• Can it be installed outdoors, or does it need a weathershield kit?

From supplier file to record

1. Resolve identity first. Link the supplier SKU, manufacturer part number and packaging identifiers without merging distinct variants or pack sizes.
2. Extract with the source attached. Pull values from rows, tables and datasheets, keeping the raw text, unit and page or row reference.
3. Map to your classification. Assign the ETIM, ECLASS, UNSPSC or internal class your company licenses, and keep the supplier's original terms.
4. Review, sync and watch. Hold conflicts and safety-related values for a category expert, write approved values to ERP or PIM, and recheck when the supplier sends a new file.

For the full method, see how to build a category attribute template and the category catalog gap audit.

FAQ