![]() American Wire Gauge (AWG) Calculator – AWG Size Chart & Table.American Wire Gauge “AWG” Chart – Wire Size & Ampacity Table.Now check the selected (7/0.036) cable with temperature factor in Table 3, so the temperature factor is 0.94 (in table 3) at 40☌ (104☏) and current carrying capacity of (7/0.036) is 28A, therefore, current carrying capacity of this cable at 40☌ (104☏) would be Ĭurrent rating for 40☌ (104☏) = 28 x 0.94 = 26.32 Amp. It means we can use 7/0.036 cable according to table 1. Now select the size of cable for load current of 24.5A (from Table 1) which is 7/0.036 (28 Amperes). Find the most suitable size of cable from energy meter to sub circuit if wiring is installed in conduits. Supply voltages are 220V and temperature is 40☌ (104☏). If the calculated value of voltage drop is greater than the value calculated in step (1) (Maximum allowable voltage drop), than calculate voltage drop for the next (greater in size) cable and so on until the calculated value of voltage drop became less than the maximum allowable voltage drop calculated in step (1).Įxample 1 … (Imperial, British or English System)įor Electrical wiring installation in a building, Total load is 4.5kW and total length of cable from energy meter to sub circuit distribution board is 35 feet.If the calculated value of voltage drop is less than the value calculated in step (1) (Maximum allowable voltage drop), than the size of selected cable is proper.This is the value of Volt drop in the cables when load current flows through it.Load factor = Load Current to be taken by Cable/ Rated Current of Cable given in the table. Now multiply this calculated value of volt drop by load factor where.(Actual length of circuit x volt drop for 100ft) /100 => to find volt drop in 100 feet. (Actual length of circuit x volt drop for 1m) /100 => to find Volt drop in per meter. Now, calculate the voltage drop for the actual length of the wiring circuit according to its rated current with the help of following formulas.(Stay cool :) We will follow both methods and systems for finding voltage drops (in meters and 100 feet) in our solved example for whole electrical installation wiring). From Table 1, find the voltage drop in meter or 100 feet (what system you prefer) according its rated current.Now, according to the load current, select a proper cable (which current rating should be nearest to the calculated load current) from table 1.First of all, find the maximum allowable voltage drop.To find voltage drop in a cable, follow the simple steps given below.
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