Zone · Guides · UL listed wire connectors
UL listed wire connectors: what the listing means
“UL listed” on a wire nut means samples of that connector were evaluated by UL to a named safety standard. The standard is the part that matters: it says what the connector was tested for. Every Zone wire connector is listed to one of four standards, as published on its listing.
What does UL listed mean?
UL publishes standards for each kind of product and evaluates products against them. A connector that passes is listed to that standard and may carry the UL mark. A listing belongs to a product, not to a brand or a type: one lever connector being listed says nothing about another. So read the standard printed for the exact connector you buy, and check that the job is inside what that standard covers and inside the connector’s published wire range.
The four standards on Zone wire connectors
| Standard | What it covers | Zone SKUs listed to it |
|---|---|---|
| UL 486C | Splicing wire connectors: twist-on caps and other connectors for joining copper conductors, tested for pull-out, dielectric strength and heat cycling. | P12C (22–8 AWG), P13 (22–8 AWG), P6 (22–10 AWG), P11V (18–10 AWG), P3 (22–14 AWG), P2 (22–14 AWG), PC623 (28–12 AWG), PC333 (0.5–4.0 mm²), BCT2H-100 (16–14 AWG), BCT2H-200 (16–14 AWG), BCT1H-100 (22–16 AWG), BCT1V-100 (22–16 AWG) |
| UL 467 | Grounding and bonding equipment: connectors used in the equipment-grounding path. | P99 (14–10 AWG) |
| UL 486G | Sealed splicing connectors: the same tests plus moisture ingress, for damp, wet and direct-burial locations. | R3 (20–10 AWG), R6 (20–8 AWG) |
| UL 486A-B | Wire connectors for copper and aluminium conductors: crimp butt splices, fork and ring terminals. | S2-4MBH-100 (16–14 AWG), S2-4SV-100 (16–14 AWG), S8-4BV-25 (8 AWG), R1-5LBH (22–16 AWG), R1-4SV-100 (22–16 AWG), R5-10V-25 (12–10 AWG) |
Some listings also print a voltage rating (600 V / 1000 V; 300 V; 600 V); it is shown on that connector’s row of the certifications page.
Are wire nuts UL listed?
Zone’s are. Every Zone twist-on wire nut is listed to UL 486C, except the green grounding cap, which is listed to UL 467 as grounding equipment. By colour and size: wire nut size and colour chart.
Are lever nuts UL listed?
Zone’s are: the PC623 lever connector (28–12 AWG) is listed to UL 486C, and the PC333 push-in connector (0.5–4.0 mm²) is listed to UL 486C. That is the same standard as Zone’s twist-on caps. Lever and push-in connectors.
UL listed for wet or buried splices
UL 486C does not include the moisture test. For a splice that will be wet, damp or buried, look for UL 486G. Zone’s silicone-filled caps (R3, R6) carry it, for direct burial. Waterproof direct-bury wire nuts.
UL listed vs ETL listed
UL and Intertek (the ETL mark) are both nationally recognized testing laboratories. Each tests to a named standard; the mark tells you who tested it, and the standard tells you what for. On this site, Zone wire connectors carry UL listings and the Zone lighting products that publish a listing carry ETL. The certifications page lists both, product by product.
Every Zone listing, by connector
| Connector | Zone SKU | Wire range | Listing |
|---|---|---|---|
| Tan winged wire nutTwist-on wire nuts | P12C | 22–8 AWG | UL 486C |
| Red winged wire nut, heavy dutyTwist-on wire nuts | P13 | 22–8 AWG | UL 486C |
| Red wire nutTwist-on wire nuts | P6 | 22–10 AWG | UL 486C |
| Yellow winged wire nutTwist-on wire nuts | P11V | 18–10 AWG | UL 486C |
| Orange wire nutTwist-on wire nuts | P3 | 22–14 AWG | UL 486C |
| Blue compact wire nut, low profileTwist-on wire nuts | P2 | 22–14 AWG | UL 486C |
| Green grounding wire nut, with holeTwist-on wire nuts | P99 | 14–10 AWG | UL 467 |
| Waterproof wire nut, silicone-filledWaterproof, direct bury | R3 | 20–10 AWG | UL 486G |
| Waterproof wire nut, silicone-filledWaterproof, direct bury | R6 | 20–8 AWG | UL 486G |
| 3-port lever wire connectorLever and push-in | PC623 | 28–12 AWG | UL 486C |
| 3-port push-in wire connectorLever and push-in | PC333 | 0.5–4.0 mm² | UL 486C |
| Heat-shrink butt connectorCrimp terminals | BCT2H-100 | 16–14 AWG | UL 486C |
| Heat-shrink butt connectorCrimp terminals | BCT2H-200 | 16–14 AWG | UL 486C |
| Heat-shrink butt connectorCrimp terminals | BCT1H-100 | 22–16 AWG | UL 486C |
| Vinyl butt connectorCrimp terminals | BCT1V-100 | 22–16 AWG | UL 486C |
| Heat-shrink fork terminal, #8 studCrimp terminals | S2-4MBH-100 | 16–14 AWG | UL 486A-B |
| Fork terminal, #8 studCrimp terminals | S2-4SV-100 | 16–14 AWG | UL 486A-B |
| Fork terminal, #8 stud, heavy dutyCrimp terminals | S8-4BV-25 | 8 AWG | UL 486A-B |
| Heat-shrink ring terminal, #10 studCrimp terminals | R1-5LBH | 22–16 AWG | UL 486A-B |
| Ring terminal, #8 studCrimp terminals | R1-4SV-100 | 22–16 AWG | UL 486A-B |
| Ring terminal, 3/8 in studCrimp terminals | R5-10V-25 | 12–10 AWG | UL 486A-B |
As published on each Zone Amazon listing. Nearly 15 million Zone wire connectors sold on Amazon since 2024.