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AC 43.13-1B CHG 1 9/27/01 TABLE 11-7. Examples of determining required tin- plated copper wire size and checking voltage drop using figure 11-2 (3) Voltage drop calculations for alumi num wires can be accomplished by multiplying the resistance for a given wire size, defined in table 11-10, by the wire run length and circuit current. (4) When the estimated or measured conductor temperature (T2) exceeds 20 °C, such as in areas having elevated ambient tem peratures or in fully loaded power-feed wires, the maximum allowable run length (L2), must be shortened from L1 (the 20 °C value) using the following formula for copper conductor wire: L2 = (258.1 °C)(L1) (238.1°C)+(T2) These formulas use the reciprocal of each ma terial’s resistively temperature coefficient to take into account increased conductor resis tance resulting from operation at elevated tem peratures. (5) To determine T2 for wires carrying a high percentage of their current carrying capa bility at elevated temperatures, laboratory testing using a load bank and a high- temperature chamber is recommended. Such tests should be run at anticipated worse case ambient temperature and maximum current- loading combinations. (6) Approximate T2 can be estimated using the following formula: T2 =T1 +(TR −T1)( I2 /Imax ) Voltage drop Run Lengths (Feet) Circuit Current (Amps) Wire Size From Chart Check- calculated volt- age drop (VD)= (Resistance/Ft) (Length) (Cur- rent) 110720 0.5 90 20 48820 710020 No. 6 No. 4 No. 12 No. 14 VD= (.00044 ohms/ft) (107)(20)= 0.942 VD= (.00028 ohms/ft) (90)(20)= 0.504 VD= (.00202 ohms/ft) (88)(20)= 3.60 VD= (.00306 ohms/ft) (100)(20)= 6.12 (254.5 °C)(L1) (234.5 °C)+)(T 2) TABLE 11-8. Examples of determining maximum tin- plated copper wire length and checking voltage drop using figure 11-2. L2 = For aluminum conductor wire, the formula is: Maximum Voltage drop Wire Size Circuit Current (Amps) Maximum Wire Run Length (Feet) Check-calculated voltage drop (VD)= (Resis- tance/Ft) (Length) (Current) 1 No.10 20 39 0.5 --- 19.5 4 --- 156 7 --- 273 VD= (.00126 ohms/ft) (39)(20)= .98 VD= (.00126 ohms/ft) (19.5)(20)= .366 VD= (.00126 ohms/ft) (156)(20)= 3.93 VD= (.00126 ohms/ft) (273)(20)= 6.88 (2) As an alternative method or a means of checking results from figure 11-2, continu ous flow resistance for a given wire size can be read from table 11-9 and multiplied by the wire run length and the circuit current. For inter mittent flow, use figure 11-3. Page 11-22 Par 11-66PDF Image | AFS-640
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