Conducto EMT vs. Conducto rígido: una comparación completa

1. Introducción

Choosing the right electrical conduit is one of the most important decisions in any wiring installation, whether you’re working on a commercial project, an industrial facility, or a residential upgrade.

Different environments demand different levels of protection, durability, flexibility, and compliance with electrical codes, which is why understanding conduit types is essential for both safety and performance.

Among all available options, EMT (Electrical Metallic Tubing) and Rigid Conduit are two of the most widely used systems in North America. Although they may look similar at first glance, they serve very different purposes.

EMT is lightweight, easy to bend, and cost-effective—ideal for fast installations. Rigid conduit, on the other hand, provides maximum mechanical protection and superior resistance to harsh environments, making it the preferred choice for demanding or outdoor applications.

In this guide, we’ll help you clearly understand the differences between EMT and Rigid conduit by walking you through their structure, characteristics, code requirements, applications, advantages, limitations, and installation considerations.

2. Understanding EMT Conduit Electrical Metallic Tubing

2.1 What Is EMT Conduit?

EMT (tubería metálica eléctrica) is a thin-wall metal conduit commonly used in commercial and light industrial wiring. It is an unthreaded, circular raceway designed to protect and route conductors and cables, and is typically made from steel with protective coatings or, in some cases, aluminum.

At a glance, EMT looks quite similar to rigid metal conduit, and in some classifications it’s loosely grouped under the rigid family. But because its walls are much thinner and the tubing is lighter and easier to bend, electricians usually refer to EMT as its own category.

Different EMT materials correspond to different product standards, and in the following sections we will focus primarily on UL 797A – Electrical Metallic Tubing (Aluminum and Stainless Steel) and UL 797 – Electrical Metallic Tubing ( Steel) . When sourcing EMT, make sure to confirm the material type and applicable standard.

2.2 Characteristics of EMT Conduit

EMT (Electrical Metallic Tubing) is designed not only to provide physical protection and routing for electrical conductors but also to maintain mechanical integrity under various conditions. Its key characteristics are largely defined by standardized testing procedures that ensure reliability in real-world installations.

One important aspect of EMT is its bendability and ductility. EMT is tested at both ambient and low temperatures to verify that it can be bent without cracking, weld seam separation, or significant distortion of the circular cross-section. Small-size tubes (such as ½”, ¾”, and 1″) are specifically tested for both ambient and 0°C (32°F) conditions using mandrels and standardized bend fixtures, while larger sizes follow appropriate bending procedures governed by specified minimum bend radii.

These tests, defined under standards such as UL 797 and CSA C22.2 No. 83-104, ensure that EMT maintains its shape and mechanical performance across a range of temperatures and tube sizes.

2.3 Sizes of Electrical metallic tubing

El diámetro exterior y el peso mínimo de los tubos metálicos eléctricos terminados deberán ser los indicados en la Tabla 5.1. La longitud estándar de los tubos metálicos eléctricos deberá ser de 3,05 m (10 pies) ±6 mm (±1/4 pulg.).

 2.4 What’s the color standards of EMT?

Los conductos de colores se utilizan cada vez más en el diseño y la construcción de edificios. Muchos administradores de instalaciones reconocen los beneficios de los conductos de colores y han desarrollado sus propias pautas para su aplicación en nuevos proyectos, incluidos edificios inteligentes, instalaciones gubernamentales e instituciones educativas.

Hasta el momento, el NEC y otras normas NFPA/UL no establecen códigos de colores oficiales para conductos o cables en proyectos de nueva construcción. La industria eléctrica aún carece de un estándar de colores oficial para conductos o EMT (tubos metálicos eléctricos). No existen colores prescritos para diferentes circuitos o niveles de voltaje, por lo que las elecciones de colores para EMT a menudo están influenciadas por preferencias arquitectónicas en lugar de propósitos funcionales.

Si bien no existen requisitos formales, con el tiempo se han desarrollado prácticas informales. Algunas industrias o empresas pueden adoptar sus propios estándares de codificación por colores para satisfacer necesidades operativas o protocolos de seguridad específicos.

Here are some commonly used colors for EMT (Electrical Metallic Tubing) and their typical applications.

Nota: Color identification and usage practices for EMT conduit may vary by region, industry, or project specification. While the examples above reflect common practices, local codes, standards, and authority having jurisdiction (AHJ) requirements should always take precedence. Always verify conduit color conventions and compliance requirements based on applicable local regulations before installation.

3. Protective Characteristics and Performance of EMT Conduit

EMT is not merely a thin-walled steel conduit; it represents a carefully engineered system designed to resist corrosion, endure mechanical stress, remain stable across diverse environmental conditions, and maintain safety under elevated temperatures or flame exposure. The following sections consolidate these performance aspects into a coherent protection profile, demonstrating how EMT provides a reliable, long-term safeguard for electrical wiring across residential, commercial, and industrial applications.

3.1 EMT Conduit Protective Coatings Overview

To enhance corrosion resistance and prolong service life, EMT is typically finished with protective coatings, which can be metallic, nonmetallic, or organic. Metallic coatings, such as zinc plating, act as a primary barrier against corrosion. The integrity of the zinc layer is evaluated through the copper sulfate test, where a bright, adherent copper deposit indicates inadequate protection. A properly applied zinc coating on the exterior of EMT should prevent a bright copper deposit after four 60-second immersions, while interior zinc coatings are tested with one immersion.

Organic and polymer-based coatings provide alternate corrosion resistance, especially for applications requiring exposure to moisture, chemicals, or higher temperatures. These coatings are evaluated for elasticity, adhesion, flammability, and resistance to ultraviolet light, water, and environmental stressors, including salt spray and humid carbon dioxide-sulfur dioxide-air exposure. Coatings are also subjected to air-oven conditioning and cold-impact testing to ensure durability under extreme temperatures. Adherence and tensile strength tests confirm that the coating remains intact and effective throughout mechanical handling and environmental exposure. Together, these protective measures ensure that EMT maintains both its mechanical integrity and corrosion resistance over its service life, as specified in UL 797A standards.

3.2 Mechanical Performance of EMT Conduit

The mechanical performance of EMT is critical to ensure its durability during installation and service. Standard testing evaluates both ambient and low-temperature bending to verify ductility and structural integrity. At ambient temperature, the smallest EMT size is bent through a 90° arc without a mandrel. Acceptance criteria include no cracking, no weld seam separation, and minimal distortion of the circular cross-section.

For low-temperature conditions (0°C / 32°F), specimens are conditioned for 60 minutes and bent around a mandrel to form a 90° arc. The bending process must be completed within 15 seconds of removal from the cold chamber. Tubes with nonmetallic corrosion-resistant coatings are tested at their rated minimum temperatures. Larger EMT sizes may use suitable bending equipment, but the bend radius remains governed by standard specifications.

In addition to bending, cold impact tests simulate accidental knocks or drops during handling and installation. Specimens are conditioned at the rated low temperature, then subjected to controlled impact energy. The coating must not separate from the metal, nor should bare metal be exposed. These rigorous mechanical tests, as outlined in UL 797A and CSA C22.2 No. 83-104, confirm that EMT can withstand bending, cold, and impact stresses without compromising its protective coating or structural integrity, ensuring long-term reliability in field installations.

3.3 Environmental Resistance of Electrical nonmetallic Tubing

EMT conduit must withstand various environmental stresses to ensure long-term performance. Protective coatings—zinc, organic, or other alternate corrosion-resistant materials—are tested for resistance to moisture, corrosive atmospheres, ultraviolet (UV) light, and temperature extremes.

Salt spray (fog) tests expose both as-received and air-oven conditioned specimens to a saline mist for 600 hours. Unscribed specimens must show minimal corrosion, while scribed specimens are evaluated based on the creeping distance of red rust, ensuring that coating adhesion and substrate protection are maintained.

For moist carbon dioxide-sulfur dioxide-air exposure, EMT samples are subjected to 1200 hours in a controlled chamber. The unscribed surfaces should exhibit only light corrosion, and the scribed areas are limited to a maximum rust creeping distance of 1.6–3.2 mm, with no separation of coating from the substrate. These tests simulate industrial environments with acidic or polluted atmospheres, confirming the coating’s ability to prevent metal degradation.

UV and water exposure tests further assess durability under sunlight and precipitation. Both scribed and unscribed specimens are exposed to controlled cycles of light and water spray using carbon-arc or xenon-arc apparatus. Acceptable results include no blistering or pitting, and minimal rust formation at scribed areas.

Air-oven conditioning simulates prolonged high-temperature exposure, typically at 100°C for 240 hours, before specimens undergo salt spray and moist CO₂-SO₂-air tests. This ensures that thermal aging does not compromise corrosion resistance.

These environmental tests, as defined in UL 797A, validate that EMT conduits with appropriate coatings can maintain protective performance across diverse field conditions, providing reliable corrosion protection for both indoor and outdoor installations.

3.4 Temperature Ratings and Flammability of EMT

EMT conduits are rated for both maximum and minimum ambient temperatures to ensure safe operation under varying field conditions. Tubing with nonmetallic alternate corrosion-resistant coatings is typically marked with a maximum use temperature of 90°C (200°F). When tested for higher ambient temperatures, the conduit is marked with the evaluated temperature rating based on UL 797A Clause 6.2.4.4.1. Similarly, the minimum use temperature is marked at 0°C (32°F) or the lower rated temperature for specially tested conduits (Clause 6.2.1.3). Markings are applied at intervals not exceeding 3.05 m (10 ft) along each length to ensure clear identification.

Flammability performance is critical for EMT conduits in building applications. Vertical specimens of tubing with nonmetallic alternate corrosion-resistant coatings undergo three 60-second flame applications, with 30-second intervals. The conduit must not continue to flame for more than 5 seconds after any application, nor emit flaming particles that ignite surrounding cotton. Coating consumption is not permitted during or after flame exposure. The test setup follows precise guidelines for specimen positioning, burner dimensions, flame height, and temperature (tip of blue inner cone ≥ 816°C / 1500°F), ensuring reproducible and consistent evaluation (Clauses 6.2.4.11.1–6.2.4.11.8).

Compliance with these temperature and flammability standards guarantees that EMT conduits maintain mechanical integrity and protective coatings under both thermal stress and potential fire exposure, meeting stringent safety requirements for commercial and light industrial installations.

3.5 Markings

Each finished EMT straight length and factory elbow shall be marked with the manufacturer’s name, trade name, or other distinctive marking. If the responsible organization differs from the manufacturer, both shall be identified. Private labels may also be identified.

In the U.S., tubing and elbows from multiple factories must have distinctive factory markings (may be coded). This does not apply in Canada.

Each straight length and elbow shall be legibly marked “Electrical Metallic Tubing” or “EMT”, with letters at least 3 mm (1/8 in) high, using durable methods (die stamping, ink, paint).

Each finished piece shall be marked “Consult manufacturer for proper installation” or equivalent wording.

Tubing with a nonmetallic alternate corrosion-resistant coating may be marked with a maximum use temperature of 90°C (200°F) or the tested maximum. Marking frequency: at least once every 3.05 m (10 ft) and at least once per piece.

Similarly, the minimum use temperature may be marked as 0°C (32°F) or the tested minimum, with the same marking frequency.

3.6 Applications of EMT: Where and When to Use

Edificios comerciales: EMT is widely used in stores, offices, educational facilities, and restaurants where the wiring environment is clean, dry, and predictable. Its neat appearance and slim profile make it easy to integrate into suspended ceilings and partition walls.

Light Industrial Environments: In light manufacturing, assembly areas, laboratories, and workshops where electrical systems are exposed to some activity but not heavy mechanical stress, EMT offers a good balance between protection, cost, and flexibility.

Indoor Residential Garages & Utility Areas: For residential garages, basements, or utility rooms that require visible surface wiring, EMT provides an organized, code-compliant, and visually clean solution without the need for heavy-duty conduit systems.

Public and Institutional Buildings: Hospitals, schools, airports, and community centers often use EMT for exposed or semi-concealed runs because it allows fast installation, clean routing, and easy future maintenance.

Ceilings and Partition Walls in New Construction: Because EMT bends smoothly and routes neatly through tight architectural spaces, it is highly suitable for wiring in ceilings and light partition walls in new construction, enabling quick installation while maintaining structural integrity.

Low- to Moderate-Risk Utility Spaces: In mechanical rooms, equipment closets, and indoor service corridors where temperature, humidity, and physical risks are controlled, EMT provides sufficient protection while allowing convenient maintenance.

4. Understanding Rigid Conduit: Types, Features, and Uses

4.1 What’s rigid conduit?

El conducto rígido se refiere a un tipo de conducto eléctrico que se caracteriza por su construcción sólida y de paredes gruesas. Este conducto está diseñado para proporcionar una vía protectora resistente y duradera para el cableado eléctrico. A diferencia de los conductos flexibles, los conductos rígidos son rígidos e inflexibles, lo que ofrece una protección superior contra daños físicos y factores ambientales.

Los conductos rígidos pueden ser metálicos o no metálicos, y dentro de esas categorías se incluyen distintos tipos. Los conductos metálicos suelen estar hechos de acero revestido, acero inoxidable o aluminio, con o sin canalización roscada. Los tubos no metálicos, sin rosca y de paredes lisas están disponibles en varios sustratos, incluidos polietileno de alta densidad, PVC y RTRC (fibra de vidrio).

It is important to note that, depending on custom and context, the term “rigid conduit” is sometimes used interchangeably with “rigid metal conduit” to refer to the metal type specifically. However, in a broader sense, it can also include other rigid types like polyvinyl chloride (PVC) conduit.

4.2 What’s the types of Rigid conduit?

Rigid Metal Conduit (RMC) is a threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables. (Refer in NEC article 344)

La construcción de conductos metálicos rígidos (RMC) está regulada por diversas normas, como la NEC 344.100, que especifica los materiales que se pueden utilizar para fabricar RMC. Según esta norma, los RMC deben estar fabricados con uno de los siguientes materiales: acero con revestimientos protectores, aluminio, latón rojo, acero inoxidable.

It’s worth noting that Galvanized Rigid Steel Conduit (GRC) is a specific type of Rigid Metal Conduit (RMC) made from galvanized steel. The galvanization process involves coating the steel with a layer of zinc to enhance its corrosion resistance, making GRC particularly suitable for outdoor and industrial applications where exposure to moisture, chemicals, or other corrosive elements is a concern.

Dado que el GRC se conoce comúnmente como RMC, puede haber cierta confusión al momento de realizar la compra. Por lo tanto, es esencial confirmar con su proveedor exactamente qué materiales se utilizan en la construcción del conducto para asegurarse de que cumple con los requisitos específicos de su proyecto. Esta distinción es importante porque, si bien el GRC ofrece una excelente durabilidad y resistencia a la corrosión, otros materiales como el aluminio, el latón rojo o el acero inoxidable pueden ser más adecuados según la aplicación y las condiciones ambientales.

In addition to Galvanized Rigid Conduit (GRC), there are other types of rigid conduits, including Rigid Aluminum Conduit (RAC) and Rigid Steel Conduit (RSC), each serving specific purposes based on their material properties. The names of these conduits directly indicate the material they are made from.

Rigid Aluminum Conduit (RAC) is made from lightweight yet durable aluminum, offering excellent resistance to corrosion and making it ideal for both indoor and outdoor applications where ease of handling and reduced weight are beneficial.

Rigid Steel Conduit (RSC), on the other hand, is constructed from robust steel, providing superior strength and mechanical protection for electrical wiring in harsh or high-impact environments.

Tanto RAC como RSC ofrecen ventajas distintivas según las condiciones y requisitos de instalación, brindando a los usuarios flexibilidad para elegir el material de conducto adecuado para sus necesidades específicas.

Always verify the material specifications with your supplier to ensure you are getting the right type of conduit for your needs, particularly when the term “RMC” is used interchangeably with “GRC.”

Conducto metálico intermedio (IMC)

Intermediate Metal Conduit (IMC) is a steel threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables. (Refer in NEC article 342)

El conducto metálico intermedio (IMC) debe estar hecho de uno de los siguientes materiales: acero con revestimientos protectores y acero inoxidable. El conducto metálico intermedio (IMC) pesa aproximadamente 33% menos que el conducto metálico rígido (RMC).

Reinforced Thermosetting Resin Conduit (RTRC) is a rigid nonmetallic raceway of circular cross section, with integral or associated couplings, connectors, and fittings for the installation of electrical conductors and cables. (Refer in NEC article 353)

El conducto RTRC, también conocido como conducto de fibra de vidrio, se crea enrollando en tensión hebras de fibra de vidrio sobre un mandril giratorio, antes de impregnar las hebras con resina y curarlas a alta temperatura, lo que da como resultado una alta resistencia a la flexión y resistencia a altas temperaturas. El RTRC se caracteriza por su resistencia a la corrosión, estabilidad UV, rango de temperatura superior (incluido un excelente manejo a bajas temperaturas).

Rigid Polyvinyl Chloride Conduit (PVC) is a rigid nonmetallic raceway of circular cross section. (Refer in NEC article 352)

Los conductos de PVC rígido están fabricados con cloruro de polivinilo, un plástico muy duradero conocido por su excepcional resistencia a la humedad, los productos químicos y los factores ambientales. La fórmula específica del PVC que se utiliza para los conductos suele incluir aditivos para mejorar propiedades como la resistencia a los rayos UV, la flexibilidad y la resistencia al impacto. Estos aditivos garantizan que el conducto funcione bien en diversas condiciones, incluidas las condiciones climáticas extremas y la exposición a la luz solar.

4.3 What’s the Sizes of Rigid Conduit?

RTRC es un poco más específico y, según la información de algunos de los proveedores, sabemos que la fibra de vidrio tiene una variedad de diferentes tipos de conductos eléctricos para cumplir con los requisitos de diferentes tipos de trabajos.

Por ejemplo, la serie IPS tiene pared estándar (SW), espesor .070, pared media (MW), espesor .096, pared pesada (HW), espesor 110, pared extra pesada (XW), espesor 250.

4.4 What’s the Advantage of Rigid Conduit?

Durability and Strength: Rigid conduit is highly durable and resistant to physical damage. Its solid construction protects electrical wiring from impacts, crushing, and other potential hazards, making it suitable for both exposed and concealed installations in demanding environments.

Protection Against Environmental Factors: Rigid conduit provides excellent protection against environmental elements such as moisture, chemicals, and UV radiation. This makes it ideal for outdoor installations, underground wiring, and environments where exposure to harsh conditions is a concern.

Resistencia al fuego: Certain types of rigid conduit, such as steel conduit, offer fire-resistant properties, helping to contain the spread of flames in the event of a fire. This enhances the overall safety of the electrical system.

Long Lifespan: Due to its robust construction and resistance to corrosion and wear, rigid conduit has a long service life. This reduces the need for frequent replacements or repairs, leading to lower maintenance costs over time.

Versatility in Applications: Rigid conduit is versatile and can be used in a wide range of applications, from residential to industrial environments. It is suitable for both above-ground and underground installations, as well as in special environments like coastal areas or high-temperature settings.

4.5 What’s the Application of Rigid conduit?

Outdoor Installations & Service Entrances: Rigid conduit is ideal for exposed outdoor runs, service entrances, and exterior wall installations where the raceway may encounter weather, physical contact, or accidental impact. Its strong wall construction and protective coatings offer long-lasting resistance to moisture, UV exposure, and corrosion.

Industrial Facilities & Heavy Manufacturing: Factories, production plants, refineries, and heavy manufacturing environments often rely on rigid conduit because forklifts, machinery, and material-handling activities introduce high mechanical risks. Rigid conduit provides maximum protection for critical wiring systems thanks to its superior impact resistance and structural strength.

Hazardous Locations (Classified Areas): Chemical plants, petrochemical facilities, wastewater treatment sites, and flammable material storage zones frequently require rigid conduit due to its containment capability and compatibility with explosion-proof fittings. It helps reduce ignition risk in classified environments.

Instalaciones Subterraneas: Rigid conduit is commonly used for underground service conductors and buried pathways where soil pressure, moisture, and shifting conditions may damage lighter conduit types. Its rigidity and corrosion-resistant coatings ensure long-term reliability.

High-Traffic Public Areas: Transit stations, stadiums, parking structures, and public infrastructure benefit from rigid conduit’s exceptional impact resistance. Its robust construction helps prevent damage caused by the public, carts, vehicles, or equipment.

Structural Installations Requiring Additional Support: In situations where the conduit system may also serve as mechanical support—such as mounting pull boxes, junction boxes, or other fixtures—rigid conduit’s strength and load-bearing capability help maintain system stability.

Corrosive or Harsh Environments: With options such as hot-dip galvanizing, PVC coatings, or corrosion-resistant alloys, rigid conduit can withstand marine environments, coastal regions, food processing facilities, and chemical exposure zones where corrosion protection is crucial.

5. EMT vs. Rigid Conduit: A Practical Comparison

Choosing between EMT and rigid conduit often comes down to balancing protection level, installation conditions, cost, and code requirements. While EMT provides lightweight versatility and is widely used in commercial and light industrial projects, rigid conduit—available in steel, aluminum, PVC, fiberglass, and more—offers a broader spectrum of durability and environmental resistance. Because rigid conduit covers many materials and standards, performance can vary widely across products.

To help readers understand the core differences, the table below summarizes the most commonly compared characteristics of EMT and rigid conduit. This overview highlights general trends rather than strict specifications.

This comparison is intended for general reference only. Because rigid conduit includes multiple materials and testing standards—and because performance varies significantly between types—this table should not be used as a sole basis for product selection. 

When planning an installation, always review technical data sheets, certifications, and test values from your supplier to ensure the conduit meets your project’s environmental, mechanical, and regulatory requirements.

6. Conclusión

Choosing the right conduit—whether EMT, rigid metal conduit, PVC, or LSZH—plays a critical role in ensuring electrical system performance, safety, and long-term reliability. Each conduit type offers unique benefits in terms of strength, corrosion resistance, temperature performance, cost, and ease of installation. 

Because conduit materials, standards, and application requirements vary widely, it’s important for contractors, engineers, and inspectors to consider real project conditions rather than relying on a single characteristic or generalized comparison. Factors such as environmental exposure, physical impact, chemical resistance, bending requirements, and regulatory compliance should always guide the final selection.

Additionally, conduit performance can differ significantly between manufacturers. Temperature tolerance, UV resistance, impact strength, and long-term aging properties are directly influenced by raw material quality, resin formulation, stabilizers, and protective coatings. For example, Tubo C’s Low Smoke Zero Halogen (LSZH) conduit series, specifically designed for fire safety and low-smoke applications, is engineered to operate reliably from –45°C to +150°C (–49°F to 302°F). 

Nuestro Conducto de PVC series is designed for robustness, chemical resistance, and typical commercial and industrial use, while the Solar Series PVC conduits are formulated for high-heat outdoor environments, maintaining stable performance from –15°C to +105°C (+5°F to 221°F). These distinctions show how different materials can meet diverse project needs.

Thank you for reading! We hope this article is helpful for you.

If you have a project or need more information about our conduits, feel free to contact us. Wishing you a smooth and successful project! 

Preguntas frecuentes

1. ¿Cuál es la diferencia entre el conducto EMT y el IMC?

IMC (Intermediate Metal Conduit) is heavier and more durable than EMT (Electrical Metallic Tubing) but lighter than RMC (Rigid Metal Conduit). 

EMT is thin-walled, lightweight, and easy to bend, making it ideal for indoor applications where installation speed and cost efficiency matter. 

IMC, with its thicker walls and stronger steel alloy, offers greater protection against physical damage and corrosion, making it suitable for both indoor and outdoor environments. It provides a balance of durability and ease of handling, making it a versatile option in many electrical installations.

2. ¿RMC es lo mismo que RGS o EMT?

RGS (Rigid Galvanized Steel) is a specific type of RMC. Essentially, RGS = galvanized-steel RMC.

RMC and IMC share many characteristics: both use threaded ends, threaded fittings, and sometimes threadless fittings.

IMC has slightly thinner walls but uses a stronger alloy to maintain overall strength, making it lighter, more cost-effective, and offering slightly more fill capacity in the same trade size.

EMT is different—it cannot be threaded and instead uses set-screw or compression connectors. EMT is commonly used indoors and is not suitable for locations “subject to physical damage,” where RMC or IMC would be required.

3. Can EMT and rigid conduit be bent?

Yes. EMT can be bent easily due to its thin walls and lightweight construction, making it ideal for field bending with standard hand benders. 

Rigid metal conduit, however, is significantly harder to bend because of its thickness and strength. While bending equipment exists, bending rigid conduit on site is generally not recommended for most installers. In many cases, it is more practical to use factory elbows, fittings, or choose flexible conduit when direction changes are needed

4. What standards regulate EMT and rigid conduit?

Several major standards govern the construction, performance, and installation of EMT and rigid conduit:

• Código Eléctrico Nacional (NEC)
  • Artículo 358: Installation requirements for EMT.
  • Articles 342, 344, 355, 352: Requirements for rigid metal conduit and rigid PVC conduit.
• Underwriters Laboratories (UL) Standards
  • UL 797: Safety requirements and performance tests for EMT.
  • UL 6: Physical, mechanical, and corrosion-resistance tests for rigid metal conduit.
  • UL 651: Requirements for Schedule 40 and Schedule 80 rigid PVC conduit.
• American National Standards Institute (ANSI)
  • Norma ANSI C80.3: Dimensions and tolerances for EMT.
  • Norma ANSI C80.1: Requirements for rigid steel conduit, including material properties and coatings.
• Canadian Standards Association (CSA)
  • CSA-C22.2 No. 83.1: EMT and elbows.
  • Norma CSA C22.2 N.º 45.2: Rigid metal conduit.
  • Norma CSA C22.2 N.º 211.2: Rigid PVC conduit and fittings.
    

These examples are provided for reference only. For specific applications, always consult the original standard documents and verify compliance based on supplier-provided technical information.