Table 8......note 2

[txwireman]

Would Someone PLEASE Explain Table 8, note 2 in laymans terms with a temperature change example. Thanks, Griff.

 

[bob]

Re: Table 8......note 2

The resistance of conductors listed in table 8 are for temp at 75 degrtee C. I you want to correct the resistance for a different temp then you use the formula listed in Note 3.

R1 = the resistance in table 8 at 75 degrees
R2 = the New R at the new temp.
alpha (a) for copper = 0.00323
alpha (a) of alum = 0.00330
T2 is the new temp
R2 = R1(table 8)[1 + a(T2 - 75)]
As you go up in temp the resistance increases and
decreases as the temp goes down.