What are the primary applications for UL 3266 wire?

According to the official UL standard, UL 3266 wire is designated for the internal wiring of appliances and electronic equipment where a reliable cross-linked polyethylene (XLPE) insulation is required.

What are the temperature and voltage ratings of UL 3266?

UL 3266 is rated for a continuous operating temperature of 125°C and a voltage of 300 Vac. Notably, it is also rated for 600 Volts Peak when used for electronic purposes.

What type of insulation is used on UL 3266 wire?

The wire features extruded XLPE (Cross-linked Polyethylene) insulation with a minimum average thickness of 15 mils, offering superior thermal stability and resistance to abrasion compared to standard PVC.

UL 3266 XLPE Wire

UL 3266 XLPE Wire — 125°C / 300V Crosslinked Polyethylene Hook-Up Wire

UL Style 3266 is a 125°C crosslinked polyethylene hook-up wire within UL Subject 758, offering a higher temperature rating than PVC styles at a compact 15-mil insulation wall. Rated 125°C and 300V AC with extruded XLPE insulation, Style 3266 covers internal wiring in appliances and electronic equipment where standard PVC wire at 80–105°C has insufficient thermal margin under continuous load. Tags may indicate 600 Volts Peak — For Electronic Use Only.

The crosslinked structure of XLPE gives improved heat deformation resistance compared with many thermoplastic insulation materials, allowing a 125°C continuous rating at the same 15-mil wall and AWG as Style 1007 and 1569 PVC wire. This can support a thermal upgrade from PVC to XLPE in appliance harness designs, subject to checking fit, terminal compatibility, harness routing, and the equipment’s own approval.

Technical Specifications — UL Style 3266

UL Style	3266
UL Subject	758, Section 3
Temperature Rating	125°C
Voltage Rating	300V AC (tags may indicate 600 Volts Peak — For Electronic Use Only)
AWG Range	32 AWG – 10 AWG, solid or stranded
Insulation Material	Extruded XLPE (crosslinked polyethylene)
Insulation Thickness	15 mils min average / 13 mils min at any point
Flame Rating	Horizontal flame
Typical Use	Internal wiring of appliances and electronic equipment

UL 3266 vs UL 3271 vs UL 3321 vs UL 3666 — XLPE Comparison

Style 3266 is the compact 300V entry point of the UL Subject 758 XLPE family. The comparison below helps select the correct style without over-specifying:

Parameter	UL 3266	UL 3271	UL 3321	UL 3666
Temperature	125°C	125°C	150°C	105°C
Voltage	300V AC	600V AC / 750V DC	600V AC / 750V DC	600V AC
AWG Range	32–10 AWG	30 AWG–2000 kcmil	30 AWG–4/0 AWG	32 AWG–1000 kcmil
Semi-conductive layer	No	Optional	No	No
Best For	Compact 300V appliance internal wiring, PVC thermal upgrade	600V motor leads and power circuits	Higher-temperature 600V equipment wiring	600V internal wiring at 105°C

Typical Applications

Electronic equipment internal wiring — static internal wiring in industrial computers, power conversion equipment, and motor drives in higher-ambient enclosures where internal temperatures under load approach the PVC limit.
Motor lead connections (selected example) — winding lead and terminal wiring in motors where the operating temperature exceeds the range of 105°C PVC wire, subject to the equipment design and buyer evaluation of fit and approval.
Compact appliance internal wiring — fine-gauge internal wiring in appliances where the 15-mil wall keeps the bundle diameter compact at the required AWG.
Appliance harness thermal upgrade — a higher-temperature alternative to UL 1007 and UL 1569 PVC wire in existing harness designs, subject to checking fit, terminal compatibility, routing, and equipment approval.

To request a quotation, send the AWG size, conductor type (solid or stranded), insulation colour, voltage, temperature requirement, routing condition, quantity, and a brief description of the application. Quotations are returned within 24 hours, and mixed-AWG orders are accepted on a single shipment.