voltage drop calc - help
voltage drop calc - help
(OP)
hey there and thanks in advance -
I found this article
http://e cmweb.com/ mag/electr ic_basics_ calculatin g_voltage/
and this problem: (480v branch ckt - uncoated copper)
Determine wire size Run a stranded copper wire 200 ft at 20A.
you can use the following method. To complete the numerator, multiply as follows: 1.73 x 212.9 ohms x 200 ft x 20A = 89371.2 Dividing the 89371.2 by the acceptable voltage drop of 14.4V gives you 6207 circular mils.
Where is the 212.9 Ohms from?
thanks
I found this article
http://e
and this problem: (480v branch ckt - uncoated copper)
Determine wire size Run a stranded copper wire 200 ft at 20A.
you can use the following method. To complete the numerator, multiply as follows: 1.73 x 212.9 ohms x 200 ft x 20A = 89371.2 Dividing the 89371.2 by the acceptable voltage drop of 14.4V gives you 6207 circular mils.
Where is the 212.9 Ohms from?
thanks






RE: voltage drop calc - help
RE: voltage drop calc - help
RE: voltage drop calc - help
it is a typo -
2 x .866 x 12.9 (k for cu) x 200ft x 20A = 89371
89371/14.4 (VD branch ckt - .03 x 480) = 6206cm
thanks folks