A service has 600 kcmil aluminum ungrounded conductors in a single raceway. What is the minimum size aluminum supply-side bonding jumper?

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Q: A service has 600 kcmil aluminum ungrounded conductors in a single raceway. What is the minimum size aluminum supply-side bonding jumper?

Answer: 3/0 AWG Refer: NEC 250.102(C)(1) and Table 250.102(C)(1) Table 250.102(C)(1), aluminum conductor column: "over 500 kcmil through 900 kcmil" applies to 600 kcmil. That row requires a 1/0 AWG copper or 3/0 AWG aluminum bonding jumper. Reading the copper conductor column by mistake gives the wrong row. So the minimum aluminum supply-side bonding jumper is 3/0 AWG.

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A service has 600 kcmil aluminum ungrounded conductors in a single raceway. What is the minimum size aluminum supply-side bonding jumper?

Accepted Answer

Answer: 3/0 AWG
Refer: NEC 250.102(C)(1) and Table 250.102(C)(1)
Table 250.102(C)(1), aluminum conductor column: "over 500 kcmil through 900 kcmil" applies to 600 kcmil.
That row requires a 1/0 AWG copper or 3/0 AWG aluminum bonding jumper.
Reading the copper conductor column by mistake gives the wrong row.
So the minimum aluminum supply-side bonding jumper is 3/0 AWG.

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