225 Kcmil

[joebell]

In Mikes Grounding vs Bonding book he shows a calculation in regards to sizing main bonding jumpers [250.28(D)(1)]

The example shows 3 sets of 600 Kcmil on the ungrounded conductors for a total area of 1800 kcmil. Multiplied by 12.5% and you come to 225 kcmil. I understand the calculation, I am just wondering if this is a standard wire size or if the answer to the question should be a 250 kcmil?

 

[Dennis Alwon]

In Mikes Grounding vs Bonding book he shows a calculation in regards to sizing main bonding jumpers [250.28(D)(1)]

The example shows 3 sets of 600 Kcmil on the ungrounded conductors for a total area of 1800 kcmil. Multiplied by 12.5% and you come to 225 kcmil. I understand the calculation, I am just wondering if this is a standard wire size or if the answer to the question should be a 250 kcmil?

I don't believe that is the wire size but the calculated answer. The wire size would be 250KCM

 

[Pierre C Belarge]

Yes.
Table 8 (or Table 310.16) show that there is no standard size conductor at 225kcmil, so you need to upsize to the next size.

 

[joebell]

Yes.
Table 8 (or Table 310.16) show that there is no standard size conductor at 225kcmil, so you need to upsize to the next size.

Thats what I thought thanks guys.

 

[joebell]

BTW nice avatar Dennis. Very appropriate

 

[Dennis Alwon]

BTW nice avatar Dennis. Very appropriate

Thank you.........