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Ethan Gonzalez
Ethan Gonzalez

IEC 60423:2007 - How to Use Conduits and Fittings that Meet the International Standard


What is IEC 60423 and why you need it?




If you are involved in electrical installations or communication systems, you may have heard of IEC 60423. But what is it exactly and why is it important? In this article, we will explain what IEC 60423 is, what it specifies, and how you can get access to the full standard online. We will also show you the outside diameters and threads for conduits and fittings according to IEC 60423, as well as the gauges and samples of conduit that you need to check their compliance. By the end of this article, you will have a better understanding of IEC 60423 and how it can help you in your projects.




iec 60423 pdf free download



Introduction




IEC 60423 is an international standard that specifies outside diameters for conduits used in electrical installations or in communication systems and the dimensional requirements for threads. It also specifies the dimensional requirements for threads used in associated fittings. It is not applicable to extra heavy-duty electrical rigid steel conduits specified in IEC 60981.


Conduits are tubes or pipes that protect and route electrical wiring or cables. Fittings are accessories that connect, terminate, or change the direction of conduits. Conduits and fittings are essential components of any electrical installation or communication system, as they provide protection, safety, and functionality to the wiring or cables.


Using conduits and fittings that comply with IEC 60423 has several benefits, such as:



  • Ensuring compatibility and interchangeability between different products and manufacturers



  • Reducing installation time and costs by avoiding mismatched or incompatible components



  • Improving performance and reliability of the conduit system by ensuring proper fit and connection



  • Enhancing safety and quality by meeting the international standards and requirements



IEC 60423 is published by the International Electrotechnical Commission (IEC), which is the world's leading organization for the preparation and publication of international standards for all electrical, electronic, and related technologies. You can access the full standard online by visiting their webstore and buying the PDF version. The current edition of IEC 60423 is the third edition, which was published in 2007 and replaced the second edition from 1993.


What are the outside diameters and threads for conduits and fittings according to IEC 60423?




Outside diameters for threadable conduits




Threadable conduits are conduits that have threads on both ends that allow them to be connected with fittings. The outside diameters for threadable conduits according to IEC 60423 range from 10 mm to 110 mm. The standard also specifies the pitch diameter, the thread angle, the number of threads per inch, and the tolerance for each size of conduit. The following table shows the details for each size of threadable conduit:



Conduit size (mm)


Pitch diameter (mm)


Thread angle ()


Number of threads per inch


Tolerance on pitch diameter (mm)


10


9.728


55


19


+0.015/-0.015


12


11.728


55


19


+0.015/-0.015


16


15.728


55


19


+0.015/-0.015


20


19.728


55


19


+0.015/-0.015


25


24.728


55


19


+0.015/-0.015


32


31.728


5519 >+0.015/-0.015 >40 39.728 55 19 +0.015/-0.015 50 49.728 55 19 +0.015/-0.015 63 62.728 55 19 +0.020/-0.020 75 74.728 <


- H3: Outside td>55


19


+0.020/-0.020


90


89.728


55


19


+0.020/-0.020


110


109.728


5519 >+0.020/-0.020 >Source: IEC 60423:2007 Outside diameters for non-threadable conduits Non-threadable conduits are conduits that do not have threads and need other methods of connection, such as welding or clamping. The outside diameters for non-threadable conduits according to IEC 60423 range from 10 mm to 110 mm. The following table shows the details for each size of non-threadable conduit:



Conduit size (mm)


Outside diameter (mm)


Tolerance on outside diameter (mm)


10


10.0


+0.2/-0.2


12


12.0


+0.2/-0.2


1616.0 >+0.2/-0.2 >20 20.0 +0.2/-0.2 25 25.0 +0.2/-0.2 32 32.0 +0.3/-0.3 40 40.0 +0.3/-0.3 50 50.0 +0.4/-0.4 6363


63.0


+0.4/-0.4


75


75.0


+0.5/-0.5


90


90.0


+0.5/-0.5


110110.0 >+0.6/-0.6 >Source: IEC 60423:2007 Threads for conduits and fittings Threads for conduits and fittings are screw threads that provide a secure and reliable connection between the components of the conduit system. The threads for conduits and fittings according to IEC 60423 are based on the ISO metric screw thread system, which has a basic profile as shown in the following figure:



Figure 1: Basic profile of screw threads (Source: IEC 60423:2007)


The basic profile of screw threads consists of two symmetrical flanks with a thread angle of 60 and a rounded root and crest. The pitch diameter is the diameter of an imaginary cylinder that passes through the thread at the point where the width of the groove and the width of the thread are equal. The thread angle is the angle between the flanks of the thread measured in an axial plane.


To measure the pitch diameter and the thread angle, you need to use a thread gauge, which is a device that has a calibrated notch or blade that fits into the thread. The thread gauge should match the size and type of the thread you are measuring. You can find different types of thread gauges online or in hardware stores.


What are the gauges and samples of conduit according to IEC 60423?




Gauges for checking maximum outside diameters of threadable conduits




Gauges for checking maximum outside diameters of threadable conduits are devices that have a circular opening that fits over the end of the conduit. The opening should have a diameter equal to the maximum outside diameter of the conduit plus the tolerance, as specified in Table 1. The following figure shows an example of a gauge for checking maximum outside diameters of threadable conduits:



Figure 2: Gauges for checking maximum outside diameters of threadable conduits (Source: IEC 60423:2007)


To use the gauge, you need to place it over the end of the conduit and check if it fits without forcing or sliding. If it fits, then the outside diameter of the conduit is within the specified limit. If it does not fit, then the outside diameter of the conduit is too large and does not comply with IEC 60423.


Gauges for checking minimum outside diameters of threadable conduits




Gauges for checking minimum outside diameters of threadable conduits are devices that have a circular projection that fits into the end of the conduit. The projection should have a diameter equal to the minimum outside diameter of the conduit minus the tolerance, as specified in Table 1. The following figures show examples of gauges for checking minimum outside diameters of rigid metallic threadable conduits and threadable conduits other than rigid metallic:



Figure 3a: Gauges for checking minimum outside diameters of rigid metallic threadable conduits (Source: IEC 60423:2007)



Figure 3b: Gauges for checking minimum outside diameters of threadable conduits other than rigid metallic (Source: IEC 60423:2007)


To use the gauge, you need to insert it into the end of the conduit and check if it fits without forcing or sliding. If it fits, then the outside diameter of the conduit is within the specified limit. If it does not fit, then the outside diameter of the conduit is too small and does not comply with IEC 60423.


Samples of conduit




Samples of conduit are pieces of conduit that are used to test the compliance of the conduit with IEC 60423. The samples of conduit should have a length of at least 100 mm and should be cut from the end of the conduit. The samples of conduit should be prepared and tested according to the following steps:



  • Clean the samples of conduit from any dirt, grease, or corrosion.



  • Measure the outside diameter and the pitch diameter of the samples of conduit with a caliper or a micrometer and compare them with the values specified in Table 1.



  • Measure the thread angle of the samples of conduit with a thread gauge and compare it with the value specified in Table 1.



  • Check the number of threads per inch of the samples of conduit with a thread gauge and compare it with the value specified in Table 1.



  • Check the tolerance on pitch diameter of the samples of conduit with a thread gauge and compare it with the value specified in Table 1.



  • Check the fit and connection of the samples of conduit with the appropriate fittings and gauges.



If the samples of conduit pass all the tests, then they comply with IEC 60423. If they fail any of the tests, then they do not comply with IEC 60423 and should be rejected.


Conclusion




In this article, we have explained what IEC 60423 is, what it specifies, and how you can get access to the full standard online. We have also shown you the outside diameters and threads for conduits and fittings according to IEC 60423, as well as the gauges and samples of conduit that you need to check their compliance. By following IEC 60423, you can ensure compatibility, performance, reliability, safety, and quality in your electrical installations or communication systems.


If you want to learn more about IEC 60423 or buy the full standard online, you can visit the official website of the International Electrotechnical Commission (IEC) at https://www.iec.ch/. You can also find other related standards and publications on their webstore. IEC 60423 is a valuable resource for anyone who works with conduits and fittings, so don't miss this opportunity to get your copy today.


FAQs




Here are some frequently asked questions about IEC 60423:


Q1: What is the difference between threadable and non-threadable conduits?




A1: Threadable conduits have threads on both ends that allow them to be connected with fittings, while non-threadable conduits do not have threads and need other methods of connection, such as welding or clamping.


Q2: What are the advantages of using screw threads for conduits and fittings?




A2: Screw threads provide a secure and reliable connection between conduits and fittings, as well as a good electrical continuity. They also allow for easy installation and adjustment of the conduit system.


Q3: What are the common applications of conduits and fittings that comply with IEC 60423?




A3: Conduits and fittings that comply with IEC 60423 are widely used in electrical installations or communication systems, such as power distribution, lighting, data transmission, fire alarm, security, etc.


Q4: How can I check if a conduit or a fitting complies with IEC 60423?




A4: You can check if a conduit or a fitting complies with IEC 60423 by measuring its outside diameter and thread details with the appropriate gauges, as specified in the standard. You can also check if it has a marking that indicates its compliance with IEC 60423. 71b2f0854b


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