Choisir les gaines électriques: Comment faire ?

Video: Choosing Electrical Conduits: How to Do It? https://www.batirsamaison.net/choisir... So, what are these different types of conduits and their functions? Electrical conduits are used to mechanically protect electrical conductors according to electrical installation standards. There are different types of conduits with varying characteristics and functions. Some are specifically designed for outdoor installations, while others are suitable for indoor installations, whether buried, embedded, or surface-mounted. Conduits are available in various outside diameters, ranging from 16 to 63 mm. They are identified by a code that specifies their characteristics and properties. This code is generally composed of three or four letters and four numbers. The letters indicate the material, type, and appearance of the conduit. For example, the letter A stands for "Corrugated," C for "Composite" (if in the first position), I for "Insulating," L for "Smooth," M for "Metallic," R for "Rigid," S for "Flexible," and T for "Transversely Elastic." The numbers in the code represent specific characteristics or properties such as crush resistance, impact resistance, and the minimum and maximum temperatures the conduit can withstand. The two most common types of conduit used in domestic electrical installations, whether concealed or exposed, are ICTA and IRL conduits. ICTL conduit is primarily used embedded in concrete floors due to its tendency to propagate flames. ICTL conduit is made of polyolefins, a material with excellent mechanical properties. It is smooth and can be bent transversely. ICTA conduit is the most widely used and prevalent on the market. It is generally equipped with a metal or plastic pull wire. Corrugated and bendable laterally, it is flexible and easy to handle when installed in chases and construction voids, as well as when embedded and encased in concrete. It is recommended to use only one-third of the conduit's capacity when using sheathing. For example, in a 20 mm diameter rigid conduit, the internal surface area is 225 mm², and one-third of this area represents 75 mm². Therefore, you can run a three-wire circuit with a cross-section of 1.5 mm² (25.6 mm² of occupied surface area) and a three-wire circuit with a cross-section of 2.5 mm² (35.7 mm² of occupied surface area). This represents slightly more than 61 mm² of occupied surface area, which is within the recommended capacity of this conduit. It is possible to run several power supply circuits or other conductors in the same conduit, but it is recommended to adhere to the precautionary measure of one-third of the conduit's internal volume being occupied. Furthermore, it is advisable to run circuits of different cross-sections in the same conduit to facilitate identification. The standard also recommends several other measures, including that all conductors must be insulated, that all circuits must originate from the same protective device (residual current circuit breaker), that each circuit must be protected by a circuit breaker, that the conductor cross-sections must not differ by more than two sizes, and that conductors must not be forced into the conduit (respecting the maximum capacity). To facilitate calculations of the surface area corresponding to one-third of the conduit's internal volume, as well as to the conductor or group of conductors, conversion tables are available. Finally, to simplify electrical installations, pre-wired conduits are available in certain configurations, which are very useful and cost-effective. Recessed boxes for junction boxes and electrical fittings are also available in various sizes and configurations. To view the written and illustrated version, visit the blog: http://www.batirsamaison.net/ Subscribe to be notified of future posts. If you liked this video, please click the "like" icon. Thank you!