{"id":77856,"date":"2022-06-14T12:30:32","date_gmt":"2022-06-14T10:30:32","guid":{"rendered":"https:\/\/gahzly.com\/%d8%ad%d8%b3%d8%a7%d8%a8-%d8%a7%d9%84%d9%83%d8%a7%d8%a8%d9%84-%d8%a7%d9%84%d9%83%d9%87%d8%b1%d8%a8%d9%8a-%d9%85%d8%b9-%d9%85%d8%b1%d8%a7%d8%b9%d8%a7%d8%a9-%d8%a7%d9%84%d9%85%d8%b3%d8%a7%d9%81%d8%a9-1\/"},"modified":"2023-02-01T18:38:39","modified_gmt":"2023-02-01T16:38:39","slug":"calculation-of-suitable-electrical-cable","status":"publish","type":"post","link":"https:\/\/gahzly.com\/en\/\u0645\u0642\u0627\u0644\/calculation-of-suitable-electrical-cable\/","title":{"rendered":"Calculation of Suitable electrical cable, taking into account the distance 1"},"content":{"rendered":"
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Calculation of Suitable electrical cable, taking into account the distance <\/span><\/span><\/b><\/h1>\n

\"Calculation\u00a0Calculation of Suitable electrical cable, taking into account the distance <\/span><\/span><\/span><\/h2>\n

Calculation of Suitable electrical cable taking into account the distance. Electrical cables are considered one of the important elements of <\/span><\/span><\/span>electrical designs <\/span><\/span><\/span>that are not devoid of any electrical network. There are steps and factors that affect the selection of the appropriate electrical cable section. Therefore, let us learn how to calculate the electrical cable, taking into account the distance, step by step.<\/span><\/span><\/span><\/p>\n

Calculation of Suitable electrical cable, taking into account the distance <\/span><\/span><\/b><\/p>\n

The relationship of the electrical circuit breakers to the cable clip<\/span><\/span><\/b><\/h2>\n

At the beginning of the initial design, the capacity of the electrical circuit breaker suitable for the electrical load is chosen, then the cable section, and not vice versa, with the aim of protecting the cable by means of the circuit breaker. This is not considered the final design unless the selection is confirmed by three main and important tests, namely:<\/span><\/span><\/span><\/p>\n

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  • Thermal endurance of the cable by studying the air temperature, laying conditions and other procedures that must be followed in order for the cable to bear these requirements.<\/span><\/span><\/span><\/li>\n
  • The extent of the voltage drop to ensure that the value at the end of the cable does not exceed the permissible limits.<\/span><\/span><\/span><\/li>\n
  • Withstand the cable and the electric cutter for the maximum short current expected to pass through the cable and the electric cutter.<\/span><\/span><\/span><\/li>\n<\/ul>\n

    Important note: These tests are applied to the main cables and some special cases if the distance between the distribution panel and the load is very long only, and not the sub-lighting circuits or small loads close together such as the loads in the house.<\/span><\/span><\/span><\/p>\n

    Electric circuit breakers and electric cables<\/span><\/span><\/span><\/p>\n

    Factors affecting the selection of cable section<\/span><\/span><\/b><\/h2>\n

    Factors affecting the selection of the main cable section designed for long distances are as follows:<\/span><\/span><\/span><\/p>\n

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    • Correction factors for loading cables: including the effect of temperature, depth of burial, the effect of specific heat of the soil, and adjacent cables above or under the carriers.<\/span><\/span><\/span><\/li>\n
    • voltage drop rate.<\/span><\/span><\/span><\/li>\n
    • Maximum expected short-circuit current: The maximum short-circuit current to be tolerated by the circuit breaker and cable and the disconnection time must be coordinated.<\/span><\/span><\/span><\/li>\n<\/ul>\n

      The maximum value that the cable can withstand during shorting can be obtained in one of the following ways:<\/span><\/span><\/span><\/p>\n

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      • Through special schedules provided by cable companies.<\/span><\/span><\/span><\/li>\n
      • Using the curves of the cable companies.<\/span><\/span><\/span><\/li>\n
      • Using approximate calculations (it varies from company to company).<\/span><\/span><\/span><\/li>\n<\/ul>\n

        Important note: We mention these steps that every technician and engineer must abide by and use the cable catalogs that you use in electrical designs, because the values, laws and calculations that companies put into the catalog differ from one company to another.<\/span><\/span><\/span><\/p>\n

        \"CalculateThe cable (wire) suitable for the electrical circuit breaker<\/span><\/span><\/b><\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
        cable clip (wire)<\/span><\/span><\/span><\/td>\nElectric breaker capacity<\/span><\/span><\/span><\/td>\n<\/tr>\n
        1.5 mm\u00b2<\/span><\/span><\/span><\/td>\n10 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        2.5 mm\u00b2<\/span><\/span><\/span><\/td>\n16 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        4 square mm<\/span><\/span><\/span><\/td>\n20 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        6 square mm<\/span><\/span><\/span><\/td>\n25 amps or 32 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        10 square mm<\/span><\/span><\/span><\/td>\n32 amps or 40 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        16 square mm<\/span><\/span><\/span><\/td>\n40 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        25 square mm<\/span><\/span><\/span><\/td>\n63 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        35 mm<\/span><\/span><\/span><\/td>\n80 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        50 square mm<\/span><\/span><\/span><\/td>\n100 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        70 square mm<\/span><\/span><\/span><\/td>\n125 amps or 160 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        The cable (wire) suitable for the electrical circuit breaker<\/span><\/span><\/span><\/p>\n

        The maximum current that a section of electric cable can withstand<\/span><\/span><\/b><\/h2>\n

        Here is an approximate table taught to electrical students showing the value of the maximum current that a section of electric cable can withstand.<\/span><\/span><\/span><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
        cable clip<\/span><\/span><\/span><\/td>\nmaximum current it can handle<\/span><\/span><\/span><\/td>\n<\/tr>\n
        1.5 mm\u00b2<\/span><\/span><\/span><\/td>\n18 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        2.5 mm\u00b2<\/span><\/span><\/span><\/td>\n21 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        4 square mm<\/span><\/span><\/span><\/td>\n27 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        6 square mm<\/span><\/span><\/span><\/td>\n35 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        10 square mm<\/span><\/span><\/span><\/td>\n48 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        16 square mm<\/span><\/span><\/span><\/td>\n65 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        25 square mm<\/span><\/span><\/span><\/td>\n88 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        35 mm<\/span><\/span><\/span><\/td>\n110 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        50 square mm<\/span><\/span><\/span><\/td>\n140 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        70 square mm<\/span><\/span><\/span><\/td>\n175 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        95 square mm<\/span><\/span><\/span><\/td>\n215 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        120 square mm<\/span><\/span><\/span><\/td>\n255 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n
        185 sq. mm<\/span><\/span><\/span><\/td>\n338 amps<\/span><\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        The maximum current that a section of electric cable can withstand<\/span><\/span><\/span><\/p>\n

        Note: These values \u200b\u200bare approximate and vary by cable configuration and manufacturer.<\/span><\/span><\/span><\/p>\n

        We note that the values \u200b\u200bin the above table are initially calculated on the basis of a copper conductor with a length not exceeding 40 meters without relying on the length of the cable, the type of conductor (copper – aluminum – a mixture between the two types) and the location of the cable (in the air – under the ground – inside a pipe – adjacent with another cable), voltage drop, short circuit current, and temperature correction coefficient.<\/span><\/span><\/span><\/p>\n

        All of the things I mentioned affect the selection of the appropriate cable section and the amount of influence is increased.<\/span><\/span><\/span><\/p>\n

        Steps for Calculation of Suitable electrical cable, taking into account the distance<\/span><\/span><\/b><\/h2>\n

        Simply, without going into the details of voltage drop and distances, there are three main steps that can be used for home wiring:<\/span><\/span><\/span><\/p>\n

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        • First: calculate the current of the electrical device<\/span><\/span><\/span><\/li>\n<\/ul>\n

          Electric current (I) = electrical device power (P) \u00f7 (source voltage (V) x power factor (PF))<\/span><\/span><\/span><\/p>\n

          whereas:<\/span><\/span><\/span><\/p>\n

          Ampere (A)<\/span><\/span><\/span><\/p>\n

          Volt (V)<\/span><\/span><\/span><\/p>\n

          The value of the power factor is between 0.8 and 1, depending on what is written on the device.<\/span><\/span><\/span><\/p>\n

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          • Second: Calculating the current capacity of the electric circuit breaker:<\/span><\/span><\/span><\/li>\n<\/ul>\n

            The current capacity of the electrical circuit breaker = the current of the electrical device x a safety coefficient ratio (1.25)<\/span><\/span><\/span><\/p>\n

            Then we choose the closest breaker capacity available in the market so that the capacity is greater than the value that appeared in the output.<\/span><\/span><\/span><\/p>\n

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            • Third: Calculating the area of \u200b\u200bthe electric cable section<\/span><\/span><\/span><\/li>\n<\/ul>\n

              Electric cable section = breaker current capacity x safety coefficient ratio (1.2)<\/span><\/span><\/span><\/p>\n

              Then we choose a cable section that can withstand a current higher than the value that appeared in the result, and this is done by relying on the data sheet of the cable and searching for the current capacity table that each cable section can bear.<\/span><\/span><\/span><\/p>\n

              Important note: These calculations are suitable for cables used in home wiring and small buildings.<\/span><\/span><\/span><\/p>\n

              And for short distances, as the large distances need additional calculations such as: voltage drop percentage, short current, and correction coefficients.<\/span><\/span><\/span><\/p>\n

              Calculation of Suitable electrical cable, taking into account the distance <\/span><\/span><\/b><\/h2>\n

              An electric load with a capacity of 2000 watts and works on a voltage of 220 volts, knowing that the power factor of this device is 0.9.<\/span><\/span><\/span><\/p>\n

              Calculate the current of the load, the capacity of the suitable breaker, and the area of \u200b\u200bcable section suitable for this load.<\/span><\/span><\/span><\/p>\n

              the solution:<\/span><\/span><\/span><\/p>\n

              Electric current (I) = electrical device power (P) \u00f7 (source voltage (V) x power factor (PF))<\/span><\/span><\/span><\/p>\n

              = 2000 \u00f7 (220 \u00d7 0.9)<\/span><\/p>\n

              = 2000 \u00f7 198<\/span><\/p>\n

              Load current = 10 amps<\/span><\/span><\/span><\/p>\n

              The current capacity of the electrical circuit breaker = the current of the electrical device x a safety coefficient ratio (1.25)<\/span><\/span><\/span><\/p>\n

              = 10 \u00d7 1.25<\/span><\/p>\n

              = 12.6 amps<\/span><\/span><\/span><\/p>\n

              The closest circuit breaker current available on the market is 16A.<\/span><\/span><\/span><\/p>\n

              Electric cable section = breaker current capacity x safety coefficient ratio (1.2)<\/span><\/span><\/span><\/p>\n

              = 16 x 1.2 = 19.2 amps<\/span><\/span><\/span><\/p>\n

              The closest cable cross section available on the market is 2.5mm square that can withstand a current of 21A.<\/span><\/span><\/span><\/p>\n

              Calculation of Suitable electrical cable, taking into account the distance <\/span><\/span><\/b><\/p>\n

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              Calculation of Suitable electrical cable, taking into account the distance <\/span><\/span><\/h2>\n<\/div>\n<\/header>\n<\/div>\n<\/div>\n
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              Choosing the appropriate cable for long distances is a very important issue that some people may ignore in calculations by limiting themselves to determining the load current and the circuit breaker without taking into account the length of the distance between the load and the source, and the voltage drop rate.<\/span><\/span><\/p>\n

              In this article, we will learn about the best methods through which we can determine the area of \u200b\u200b\u200b\u200bthe cable section required for the load, based on the Swedish Cable Catalog.<\/span><\/span><\/p>\n

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