📊 UL 797 & ANSI C80.3 Electrical Metallic Tubing (EMT) Engineering Specs
UL 797 Certified / ANSI C80.3 Approved
High-ductility unthreaded steel electrical conduits designed for smooth wire pulling with uniform inline galvanized outer coating and low-friction organic inner coating.
| Trade Size | Metric Designator | Nominal OD (mm / in) | Nominal WT (mm / in) | Length (10 ft / 3050mm) |
|---|---|---|---|---|
| 1/2” | 16 | 17.93 mm (0.706 in) | 1.07 mm (0.042 in) | 3050 mm (±6.35mm) |
| 3/4” | 21 | 23.42 mm (0.922 in) | 1.25 mm (0.049 in) | 3050 mm (±6.35mm) |
| 1” | 27 | 29.54 mm (1.163 in) | 1.45 mm (0.057 in) | 3050 mm (±6.35mm) |
| 1-1/4” – 2” | 35 – 53 | 38.35mm – 55.80mm | 1.65 mm (0.065 in) | 3050 mm (±6.35mm) |
| 2-1/2” – 4” | 63 – 103 | 73.03mm – 114.30mm | 1.83mm – 2.11mm | 3050 mm (±6.35mm) |
UL 797 EMT Conduit Pipe Manufacturer in China
Sino East Steel Group manufactures UL 797 certified Electrical Metallic Tubing (EMT Conduit) and IMC/RSC conduits in Tianjin for commercial electrical installations, infrastructure cabling, and industrial plants.
Real Production, Warehouse & Seaworthy Export Packaging
Why Procure Direct from Sino East Steel Group
💰 Direct Mill Pricing
Eliminate intermediate trading markups with transparent factory FOB/CIF pricing and flexible payment terms for volume contracts.
🛡️ Certified EN 10204 3.1 MTC
Full heat-number traceability, guaranteed mechanical/chemical tolerances, and complete third-party inspection (SGS/BV) compliance.
🚢 1x20GP Mixed Cargo Support
Consolidate various sizes, specifications, and hardware fasteners into single 25-ton container loads to minimize inventory overhead.
Manufacturing Specifications & Technical Range
| Standard & Certifications | UL 797, ANSI C80.3, Underwriters Laboratories Listed, cULus |
|---|---|
| Trade Sizes | 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″, 2-1/2″, 3″, 3-1/2″, 4″ |
| Standard Length | 10 Feet (3.05 meters) per stick with standard color tape bundle marking |
| Corrosion Protection | Exterior triple-layer coating (Zinc + Conversion + Organic) & interior clear polyurethane |
Ready to Procure Direct from Tianjin Steel Manufacturer?
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1. Full Trade Size Dimensional Matrix & Galvanizing Tolerances (UL 797 / ANSI C80.3)
Sino East Steel manufactures high-ductility Electrical Metallic Tubing (EMT) using high-frequency induction welded prime steel strip. Complies with UL 797 (Certificate # / Standards Compliance), ANSI C80.3, and CSA C22.2 No. 83.1. Hot-dip inline galvanized exterior with organic corrosion-resistant clear topcoat and ultra-smooth low-friction interior coating for zero wire snagging.
| Trade Size (Inch) | Metric Designator | Outside Diameter (mm / in) | Nominal Wall Thickness (mm / in) | Standard Length (with Coupling) | Bundle Qty (Pcs/Bundle) |
|---|---|---|---|---|---|
| 1/2″ | 16 | 17.93 mm (0.706″) ±0.13mm | 1.07 mm (0.042″) ±0.10mm | 3050 mm (10 ft) -6mm | 100 pcs |
| 3/4″ | 21 | 23.42 mm (0.922″) ±0.13mm | 1.25 mm (0.049″) ±0.10mm | 3050 mm (10 ft) -6mm | 100 pcs |
| 1″ | 27 | 29.54 mm (1.163″) ±0.13mm | 1.45 mm (0.057″) ±0.10mm | 3050 mm (10 ft) -6mm | 50 pcs |
| 1-1/4″ | 35 | 38.35 mm (1.510″) ±0.13mm | 1.65 mm (0.065″) ±0.10mm | 3050 mm (10 ft) -6mm | 30 pcs |
| 1-1/2″ | 41 | 44.20 mm (1.740″) ±0.13mm | 1.65 mm (0.065″) ±0.10mm | 3050 mm (10 ft) -6mm | 25 pcs |
| 2″ | 53 | 55.80 mm (2.197″) ±0.13mm | 1.65 mm (0.065″) ±0.10mm | 3050 mm (10 ft) -6mm | 20 pcs |
| 2-1/2″ | 63 | 73.03 mm (2.875″) ±0.25mm | 1.83 mm (0.072″) ±0.15mm | 3050 mm (10 ft) -6mm | Lift / Master Bundle |
| 3″ | 78 | 88.90 mm (3.500″) ±0.25mm | 1.83 mm (0.072″) ±0.15mm | 3050 mm (10 ft) -6mm | Lift / Master Bundle |
| 4″ | 103 | 114.30 mm (4.500″) ±0.25mm | 2.11 mm (0.083″) ±0.15mm | 3050 mm (10 ft) -6mm | Lift / Master Bundle |
2. Critical Engineering Comparison: EMT vs IMC vs RMC (Rigid Metal Conduit)
EMT (Electrical Metallic Tubing) is a thin-wall unthreaded raceway ideal for commercial indoor, ceiling, and exposed wall wiring where easy bending (ductility test compliant) and lightweight handling are essential. In contrast, IMC (Intermediate Metal Conduit) and RMC (Rigid Metal Conduit – ANSI C80.1 / UL 6) feature thicker walls with threaded ends for heavy hazardous, underground, or severe industrial environments.
3. Frequently Asked Technical Questions on UL 797 & ANSI C80.3 Galvanizing
Yes. ANSI C80.3 Section 6 and UL 797 mandate that the exterior surface must have a continuous, uniform zinc protective coating (tested via copper sulfate Preece test or magnetic gauge) supplemented by an organic clear coat. The interior raceway must feature an approved corrosion-resistant lubricant coating with low coefficient of friction to facilitate rapid cable pulling.
Each production lot undergoes 90° Cold Bending Tests without cracking of the weld seam or flaking of the zinc coat, Flattening Tests along the weld line, and precise wall thickness micrometer verification.
Specialized Galvanized Steel Pipes for Electrical Conduits & HVAC Air Conditioning Delivery
Sino East Steel is a direct China manufacturer of heavy-duty galvanized conduit and ventilation pipes engineered for commercial building electrical wiring and central air conditioning (HVAC) duct delivery systems. Built to withstand high mechanical impact, thermal variation, and severe corrosion.
| Category & Application | Governing Standard | Trade Size / Outer Diameter | Zinc Coating Mass | Bending & Impact Performance |
|---|---|---|---|---|
| EMT Electrical Metallic Tubing | UL 797 / ANSI C80.3 | 1/2″ to 4″ (17.93mm – 114.3mm) | Pre-Galvanized (120-180 g/m²) + Clear Coat | Cold bendable up to 90° without duct seam cracking |
| IMC / RMC Heavy Conduit | UL 1242 / UL 6 / ANSI C80.6 | 1/2″ to 6″ (21.3mm – 168.3mm) | Hot-Dip Galvanized (300-500 g/m²) | Explosion-proof hazardous location wiring |
| HVAC Air Conditioning Delivery Pipes | ASTM A53 / BS 1387 Class A/B | 1/2″ to 12″ (21.3mm – 323.8mm) | Hot-Dip Galvanized ≥ 300 g/m² | Hydrostatic tested 50 bar for chilled water & air ducts |
Heavy-Duty & Hazardous Location Projects: For petrochemical facilities, offshore platforms, or direct burial requiring maximum explosion protection, explore our UL 1242 IMC & UL 6 RMC Heavy-Duty Rigid Metal Conduits with NPT threaded ends.