THHN 12 AWG, NM-B 12/2, and UF-B 14/2 are three distinct exact entries in the imported Cable Marking Decoder lookup rows. The shared presence of AWG does not make the family labels interchangeable.
Comparison table
| Input | Family meaning in the current data | Conductor notation | Gauge |
|---|---|---|---|
| THHN 12 AWG | Thermoplastic high heat-resistant nylon-coated wire family. | Single wire entry; no count segment in the current marking. | 12 AWG. |
| NM-B 12/2 | Nonmetallic-sheathed cable family; US product category. | Two insulated conductors; grounding conductor commonly implied in retail marking. | 12 AWG. |
| UF-B 14/2 | Underground feeder cable family. | Two insulated conductors; grounding conductor may be part of common product marking. | 14 AWG. |
Read family before gauge
In these rows, the family label determines the surrounding description while the gauge identifies the conductor size recorded by the lookup. Start with THHN, NM-B, or UF-B, then read the rest of the matched entry.
Do not infer ampacity from the table
The current decoder warning applies directly here: 12 AWG or 14 AWG does not produce an ampacity result by itself. This comparison is for visible marking interpretation only.
Verification checklist
- Preserve the hyphen in NM-B and UF-B.
- Preserve the slash in 12/2 or 14/2.
- Keep AWG attached to the gauge.
- Verify the full product label and data sheet before acting.
Source and limits
Imported regional power-cord rows from MicrosoftDocs/azure-docs, harmonized cable marking guides, UL wire and cable marking guidance, and manufacturer cable data sheets; verified 2026-08-30.
- This page is a production database view built from imported rows plus exact cable-marking lookup examples.
- A conductor area or gauge shown in a marking does not determine ampacity by itself.
- Manufacturer-specific suffixes and local code requirements can change the final meaning. Verify the complete product label and data sheet before acting.
- Do not treat this decoder or guide as a safety, installation, procurement, customs, or legal compliance decision.
Related cable guides
How to Read Cable Markings | Cable Conductor Count and Earth Notation | Cable Size Notation: mm2 and AWG