UL3918 300 V 125 °C XLPE Hook-Up Wire

UL3918 is a XLPE-insulated hook-up wire manufactured by Xinya Electronic Co., Ltd. It is rated 300 V, 125 °C. It is supplied in 17 recorded constructions spanning 14–28 AWG, with an overall diameter of 2–3.6 mm, cut to the length you order.

UL3918 at a glance

• 14–28 AWG, across 17 listed constructions
• Both solid (single-strand) and stranded conductors are listed — 8 solid and 9 stranded
• Insulation wall 0.44–0.49 mm
• Overall diameter 2–3.6 mm
• Max. conductor resistance 8.78–239 Ω/km at 20 °C DC (roughly 2.7–72.8 Ω per 1,000 ft)
• Routine withstand test on every listed row: 2000 VAC, 1 min

How UL3918 compares with its nearest alternatives

UL3918 and UL3272 share the 125 °C temperature rating and XLPE insulation. The distinction is in voltage rating (300 V against 600 V / 750 V). Overall diameter runs 2–3.6 mm for UL3918 against 2–5.05 mm for UL3272. UL3918 is the tighter of the two where harness space is limited. Insulation wall is 0.44–0.49 mm against 0.79–0.83 mm.

UL3918 and UL3917 share the 125 °C temperature rating and XLPE insulation. The distinction is in voltage rating (300 V against 600 V). Overall diameter runs 2–3.6 mm for UL3918 against 2.5–4.1 mm for UL3917. UL3918 is the tighter of the two where harness space is limited. Insulation wall is 0.44–0.49 mm against 0.78–0.82 mm.

Conductor construction and selection

Both conductor families are listed. Single-strand rows such as 1/0.32 at 28 AWG suit fixed routing and insulation-displacement termination, where the conductor is not flexed after installation. Stranded rows such as 7/0.127 at 28 AWG flex repeatedly and are the usual choice for hand-soldered harnesses and anything that has to follow a moving path. Conductor resistance is the same at a given size, so the choice between them is mechanical rather than electrical.

How to read the UL3918 table

“Insulation O.D. (mm)” is measured over the insulation, not over a jacket, tape or braid. Conductor resistance is stated at 20 °C DC per kilometre — divide by 3.281 for ohms per 1,000 ft. The withstand column is a routine production test applied to finished lengths, not a continuous working voltage.

Questions buyers ask about UL3918

Which sizes of UL3918 are available?

14–28 AWG, across the 17 constructions in the table below. Sizes outside the table can be quoted on request.

Can UL3918 be supplied in both solid and stranded conductor?

Yes. The documented range covers 17 constructions, of which 8 are single-strand and 9 are stranded. Give the construction, not only the AWG, when you request a quotation.

What overall diameter does UL3918 run to?

The documented range is 2–3.6 mm. Quote the size, not the style alone, when the diameter has to fit a specific gland, grommet or channel.