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Voltage_Drop_Corrected

VIEWS: 7 PAGES: 1

									                                 Miller Solar
                 17395 Oak Rd. Atascadero, CA 93422 805-438-5600
                               www.millersolar.com
                          VOLTAGE DROP WORKSHEET

                Client:
               Project:
                 Date:

Instructions:
Enter design values in Data Entry block below. Percent voltage drop is displayed
 below. Voltage Drop values greater than 1% are red.
Corrected ampacities for conductors are shown.
Feel free to share this spread sheet but please keep my company name
listed.
We assume no liability for the use of this tool.
Version: 3.0                      Date last modified:       2/23/2010
William Miller                         william@millersolar.com

             Data Entry
    System Voltage            550
                Amps          8.80       Convert Faren to Cent
     Feet One Way             180         Farenheit       60
   Temperature ( C)            16        Centigrade       16
        Conduit Fill            9
 Temperature Factor           1.05
   Conduit fill Factor        0.7

                                  COPPER (Stranded)
                             Percent    310-16 75C    Corrected      Corrected for
        Size              Voltage Drop*   Amps        Ampacity**        PV***
          14                  1.46%         20          14.7              9.4
          12                  0.92%         25          18.4             11.8
          10                  0.58%         35          25.7             16.5
           8                  0.36%         50          36.8             23.6
           6                  0.23%         65          47.8             30.6
           4                  0.14%         85          62.5             40.0
           2                  0.09%        115          84.5             54.2
           1                  0.07%        130          95.6             61.2
           0                  0.06%        150          110.3            70.7
          00                  0.05%        175          128.6            82.4
         000                  0.04%        200          147.0            94.2
        0000                  0.03%        230          169.1           108.4
         250                  0.02%        255          187.4           120.1
         300                  0.02%        285          209.5           134.3
         500                  0.01%        380          279.3           179.0

Notes:
* Derived from values Table 8 and corrected for temperature per footnote 2.
** Corrected for conduit fill per Table 310.15(B)(2)(a) conduit fill and 310.16 temperature.
*** Section 690 requires PV circuits to be rated at 125% short circuit amps for continuous duty and another 125%
for enhanced insolation possibilities. This column uses a 0.64 factor to apply the inverse of 1.56.
-Data from 2002 NEC, Chapter 9, Table 8 and table 310-16. Calculations are based on straight resistance for stranded wire
without consideration of reactance.

								
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