UL 1277 THHN/THWN-2 Screened Control Cable 600V
UL 1277 THHN/THWN-2 Screened Control Cable is a 600V, 90°C multiconductor tray-control cable using bare annealed copper conductors, PVC-FR/nylon insulation, an aluminum-tape overall screen, a tinned-copper drain wire and a special PVC outer sheath. It is intended for industrial control routes that may include cable trays, wireways, ducts, conduit, direct burial, wet or dry locations and outdoor tray installation.
PRODUCT OVERVIEW
This screened control cable combines THHN/THWN-2 insulated circuit conductors with an overall aluminum-tape screen and dedicated tinned-copper drain wire. The construction provides a 600V control-cable solution for industrial installations where both tray-cable routing and electrostatic screening are required.
The product data also identifies Class 1, Division 2 hazardous-location applications, including oil, gas and petrochemical environments. Project use in hazardous locations should be coordinated with the applicable electrical code, sealing method, fittings and the specific cable listing required by the installation.
KEY FEATURES
- UL 1277 referenced complete tray-cable construction.
- 600V voltage rating and +90°C temperature rating.
- THHN/THWN-2 style PVC-FR / nylon insulated conductors.
- Aluminum-tape overall screen with tinned-copper drain wire.
- Special black PVC outer sheath.
- Listed for tray, wireway, duct and conduit applications in the source data.
- Direct-burial, wet/dry and outdoor tray applications stated in the source data.
- Sunlight-resistant outdoor tray use stated in the source data.
- Class 1, Division 2 hazardous-location use stated in the source data.
CABLE CONSTRUCTION
Conductor | Bare annealed copper |
Insulation | PVC-FR / Nylon (flame-retardant PVC with nylon covering) |
Screen | Aluminum tape |
Drain Wire | Tinned copper, 16 AWG, 7-strand |
Ripcord | Nylon |
Outer Sheath | Special PVC |
Sheath Colour | Black |
Core Identification | Color coded as E2 per ICEA S-73-532 |
UL 1277 RELATED DESIGN FEATURES
Design Feature | Product Relevance |
Multiconductor Cable | 2 to 50 cores in the listed product schedule |
Tray / Raceway Use | Matches the product’s tray, wireway, duct and conduit applications |
Overall Jacket | Special PVC outer sheath protects the screened multicore assembly |
Metal Shield | Aluminum-tape overall screen |
Drain Wire | Tinned-copper 16 AWG, 7-strand drain wire supports shield termination |
Outdoor / Wet-Dry Use | Source data lists wet/dry, direct-burial and sunlight-resistant outdoor tray applications |
THHN/THWN-2 Conductors | PVC-FR / nylon insulated conductors referenced to UL 83 as a related standard |
STANDARD REFERENCE & COMPLIANCE
Item | Details |
Referenced Standard | UL 1277 |
Current Status | Active |
Current Edition | Edition 6 |
Current Revision | May 29, 2025 |
Product Rating | 600V screened control / tray cable |
Compliance Note | For projects requiring a specific UL listing or hazardous-location approval, confirm the applicable cable marking, listing scope, installation method and project documentation before approval. |
UL 1277 covers multiconductor electrical power and control tray cables and permits constructions with one or more metal shields. The standard’s installation scope includes cable trays and raceways, with outdoor messenger-supported use addressed by the standard.
WHY UL 1277 IS THE MAIN PRODUCT STANDARD
UL 1277 is the strongest product-level reference in this cable specification because it addresses the complete multiconductor tray-cable assembly rather than only one material or conductor component. For buyers, this means the standard page should focus on the finished cable’s construction, tray/raceway use, overall jacket, screening system and installation environment.
PRODUCT APPLICATIONS
- Industrial control circuits in cable trays and wireways.
- Duct and conduit installations.
- Direct-buried control-cable routes where the specified construction and listing permit.
- Wet or dry industrial locations.
- Outdoor cable-tray installations requiring sunlight-resistant cable.
- Oil, gas and petrochemical facilities where the project calls for Class 1, Division 2 installation and the cable/listing requirements are satisfied.
- Screened control circuits routed near electrical equipment or power circuits.
The following dimensions and ampacity values are reproduced from the source product data for the listed 600V screened cable constructions.
| Cores | AWG | PVC Insul. mm | Nylon mm | Sheath mm | Overall Dia. mm | Weight kg/km | Nominal Ampacity A |
|---|---|---|---|---|---|---|---|
| 2 | 10 | 0.51 | 0.10 | 1.14 | 10.87 | 189 | 40 |
| 2 | 12 | 0.38 | 0.10 | 1.14 | 9.35 | 132 | 30.0 |
| 3 | 10 | 0.51 | 0.10 | 1.14 | 11.52 | 251 | 40 |
| 3 | 12 | 0.38 | 0.10 | 1.14 | 9.87 | 174 | 30.0 |
| 3 | 14 | 0.38 | 0.10 | 1.14 | 8.67 | 129 | 25.0 |
| 4 | 10 | 0.51 | 0.10 | 1.14 | 12.61 | 290 | 32/40 |
| 4 | 12 | 0.38 | 0.10 | 1.14 | 10.74 | 219 | 24.0/30.0 |
| 4 | 14 | 0.38 | 0.10 | 1.14 | 9.42 | 159 | 20.0/25.0 |
| 5 | 10 | 0.51 | 0.10 | 1.52 | 14.57 | 414 | 32 |
| 5 | 12 | 0.38 | 0.10 | 1.14 | 11.69 | 272 | 24.0 |
| 5 | 14 | 0.38 | 0.10 | 1.14 | 10.24 | 190 | 20.0 |
| 6 | 10 | 0.51 | 0.10 | 1.52 | 15.82 | 479 | 32 |
| 6 | 12 | 0.38 | 0.10 | 1.14 | 12.70 | 310 | 24.0 |
| 6 | 14 | 0.38 | 0.10 | 1.14 | 11.10 | 220 | 20.0 |
| 7 | 10 | 0.51 | 0.10 | 1.52 | 15.82 | 540 | 28 |
| 7 | 12 | 0.38 | 0.10 | 1.14 | 12.70 | 338 | 21.0 |
| 7 | 14 | 0.38 | 0.10 | 1.14 | 11.10 | 243 | 17.5 |
| 8 | 10 | 0.51 | 0.10 | 1.52 | 17.35 | 609 | 28 |
| 8 | 12 | 0.38 | 0.10 | 1.52 | 14.53 | 394 | 21.0 |
| 8 | 14 | 0.38 | 0.10 | 1.14 | 12.14 | 277 | 17.5 |
| 9 | 10 | 0.51 | 0.10 | 1.52 | 18.69 | 679 | 28 |
| 9 | 12 | 0.38 | 0.10 | 1.52 | 15.60 | 470 | 21.0 |
| 9 | 14 | 0.38 | 0.10 | 1.52 | 13.06 | 307 | 17.5 |
| 10 | 10 | 0.51 | 0.10 | 1.52 | 19.95 | 748 | 20 |
| 10 | 12 | 0.38 | 0.10 | 1.52 | 16.61 | 513 | 21.0 |
| 10 | 14 | 0.38 | 0.10 | 1.52 | 14.68 | 362 | 12.5 |
| 11 | 10 | 0.51 | 0.10 | 1.52 | 20.24 | 811 | 20 |
| 11 | 12 | 0.38 | 0.10 | 1.52 | 16.84 | 549 | 15.0 |
| 11 | 14 | 0.38 | 0.10 | 1.52 | 14.68 | 388 | 12.5 |
| 12 | 10 | 0.51 | 0.10 | 2.03 | 21.89 | 930 | 20 |
| 12 | 12 | 0.38 | 0.10 | 1.52 | 17.34 | 595 | 15.0 |
| 12 | 14 | 0.38 | 0.10 | 1.52 | 15.31 | 421 | 12.5 |
| 13 | 10 | 0.51 | 0.10 | 2.03 | 22.27 | 984 | 20 |
| 13 | 12 | 0.38 | 0.10 | 1.52 | 17.64 | 634 | 15.0 |
| 13 | 14 | 0.38 | 0.10 | 1.52 | 15.57 | 443 | 12.5 |
| 14 | 10 | 0.51 | 0.10 | 2.03 | 22.98 | 1116 | 20 |
| 14 | 12 | 0.38 | 0.10 | 1.52 | 18.21 | 677 | 15.0 |
| 14 | 14 | 0.38 | 0.10 | 1.52 | 16.06 | 473 | 12.5 |
| 15 | 10 | 0.51 | 0.10 | 2.03 | 23.56 | 1173 | 20 |
| 15 | 12 | 0.38 | 0.10 | 1.52 | 18.68 | 717 | 15.0 |
| 15 | 14 | 0.38 | 0.10 | 1.52 | 16.46 | 501 | 12.5 |
| 16 | 10 | 0.51 | 0.10 | 2.03 | 24.19 | 1262 | 20 |
| 16 | 12 | 0.38 | 0.10 | 1.52 | 19.19 | 747 | 15.0 |
| 16 | 14 | 0.38 | 0.10 | 1.52 | 16.89 | 533 | 12.5 |
| 19 | 10 | 0.51 | 0.10 | 2.03 | 25.45 | 1376 | 20 |
| 19 | 12 | 0.38 | 0.10 | 1.52 | 20.19 | 870 | 15.0 |
| 19 | 14 | 0.38 | 0.10 | 1.52 | 17.75 | 615 | 12.5 |
| 20 | 10 | 0.51 | 0.10 | 2.03 | 26.21 | 1443 | 20 |
| 20 | 12 | 0.38 | 0.10 | 1.52 | 20.80 | 933 | 15.0 |
| 20 | 14 | 0.38 | 0.10 | 1.52 | 18.27 | 643 | 12.5 |
| 25 | 10 | 0.51 | 0.10 | 2.03 | 29.35 | 1771 | 18 |
| 25 | 12 | 0.38 | 0.10 | 2.03 | 24.33 | 1176 | 13.5 |
| 25 | 14 | 0.38 | 0.10 | 1.52 | 20.42 | 787 | 11.3 |
| 30 | 10 | 0.51 | 0.10 | 2.03 | 31.36 | 2098 | 18 |
| 30 | 12 | 0.38 | 0.10 | 2.03 | 25.94 | 1379 | 13.5 |
| 30 | 14 | 0.38 | 0.10 | 2.03 | 22.82 | 972 | 11.3 |
| 37 | 10 | 0.51 | 0.10 | 2.03 | 33.83 | 2544 | 16 |
| 37 | 12 | 0.38 | 0.10 | 2.03 | 27.91 | 1665 | 12.0 |
| 37 | 14 | 0.38 | 0.10 | 2.03 | 24.51 | 1174 | 10.0 |
| 40 | 10 | 0.51 | 0.10 | 2.03 | 35.13 | 2738 | 16 |
| 40 | 12 | 0.38 | 0.10 | 2.03 | 28.95 | 1827 | 12.0 |
| 40 | 14 | 0.38 | 0.10 | 2.03 | 25.40 | 1262 | 10.0 |
| 45 | 10 | 0.51 | 0.10 | 2.03 | 37.23 | 3056 | 14 |
| 45 | 12 | 0.38 | 0.10 | 2.03 | 30.63 | 2039 | 10.5 |
| 45 | 14 | 0.38 | 0.10 | 2.03 | 26.84 | 1403 | 8.8 |
| 50 | 10 | 0.51 | 0.10 | 2.03 | 38.65 | 3378 | 14 |
| 50 | 12 | 0.38 | 0.10 | 2.03 | 31.77 | 2245 | 10.5 |
| 50 | 14 | 0.38 | 0.10 | 2.03 | 27.81 | 1537 | 8.8 |
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From Production to Delivery
From raw material preparation to final shipmen, every stage is caretuly controled to ensure consistent conductor quality, reliable pertormance,and sae delivery. Our roduction,
inspection, packaging, and logistics processes are managed in accordance with applicable standards and project requirements.
Production
Bare annealed copper conductors are insulated with the PVC-FR / nylon system, assembled into the required multicore construction, screened with aluminum tape together with the tinned-copper drain wire, and protected by the special PVC outer sheath.
Inspection
Inspection focuses on conductor construction, PVC/nylon insulation, core identification, aluminum-tape screen condition, drain-wire continuity, outer-jacket integrity, finished diameter and project-required electrical / flame / listing checks.
Packaging
Finished cable is wound on suitable drums according to ordered size, weight and length. Cable ends are protected and drum identification can include the standard reference, conductor size, core count, voltage rating, length and project reference.
Shipping
Before shipment, cable drums and technical documents are checked against the order. Requested inspection records, technical data, certificates and project submittal documents can be prepared for review.
Frequently Asked Questions
When should I specify UL 1277 for this screened control cable?
UL 1277 is the useful reference when the project treats the product as a complete multiconductor tray/control cable rather than simply a group of THHN/THWN-2 conductors. It is especially relevant when the installation uses cable tray, raceway, conduit or other industrial cable-routing systems and the finished cable assembly must be reviewed as one product.
Can this cable be used in Class 1, Division 2 hazardous locations?
The source product data lists Class 1, Division 2 hazardous-location applications. The final installation still needs to satisfy the applicable electrical code, cable listing, sealing and fitting requirements for the project. For oil, gas or petrochemical work, include the hazardous-area classification in the RFQ so the required documentation can be confirmed before approval.
What is the purpose of the aluminum tape and drain wire?
The aluminum tape forms an overall electrostatic screen around the multicore assembly, while the tinned-copper drain wire provides a practical connection point for terminating that screen. The grounding method should follow the project’s EMC and control-system philosophy rather than being assumed from the cable construction alone.
Can it be installed outdoors or directly buried?
The source data lists direct burial, wet/dry locations and outdoor cable trays where a sunlight-resistant rating is required. The actual project should still confirm the cable marking, burial method, mechanical protection, fittings and any local code requirements before installation.
What should be included in an RFQ for this cable?
Provide the core count, AWG size, total length, installation method, required cable marking and whether direct burial, sunlight resistance or hazardous-location use applies. Also state the required UL documentation, drum length, screen termination requirements and any customer-specific inspection or certification package.
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We provide a wide range of cable materials and electrical products, including aluminum conductors, aluminum rods, aluminum wires, overhead conductors, medium and low voltage power cables, cable insulation materials, filling materials, shielding materials, and cable manufacturing consumables.We provide customized solutions according to different cable manufacturing requirements.
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