GEC for two services

[Ponchik]

I am doing a duplex service change with one overhead drop, two 100Amp service panels, two risers with #2 service conductors.

According to 250.66 note (1) I come up with minimum of one #4 GEC to serve both panels. am i correct on this?

Thanks.



1. Where multiple sets of service-entrance conductors are used as permitted in 230.40, Exception No. 2, the equivalent size of the largest
service-entrance conductor shall be determined by the largest sum of the areas of the corresponding conductors of each set.

table 8 ch 9
#2 = 66,360 CM x 2 = 132,720
2/0 = 133,100 CM

Table 250.66
2/0 = #4 GEC

 

[Dennis Alwon]

I did not check your math but I would agree. Of course the rods only need #6 max.