Bonding aluminum

[Paul Bates]

During an independent electrical inspection, I requested a contractor to bond the metal service raceways entering from underground into the Main Distribution Panel with bond bushings per NEC 250.92 (A) (3) & 250.64 (E).
The contractor replied He used aluminum conduit and the "Bonding jumpers were eliminated/non-performed since aluminum is an alloy.
I contend impedance can still build up in aluminum, and is certainly conductive and the jumpers are required. What is your opinion, thanks Paul?

 

[augie47]

Your own reference says "metal parts".. been a longggggggggggggggg time since I was in school but I think AL is still a "metal"

Tell him he can use an aluminum bonding jumper

 

[Ben Franklin]

Metal raceways containing service conductors are required to be bonded per one of the methods outlined in 250.92(B) regardless of the material type used to form the metal raceway.

250.64(E) would only apply to a ferrous metal enclosure for the Grounding Electrode Conductor. An AL raceway in this particular instance would be free of the requirement of bonding.

 

[infinity]

I agree and as Ben stated there are other methods permitted to be used to bond service raceways. Bonding bushings are just one method.

 

[RUWired]

Tell him he can use an aluminum bonding jumper

Is an aluminum conductor considered a corrosion resistant material.

A) Material. Main bonding jumpers and system bonding jumpers shall be of copper or other corrosion-resistant material. A main bonding jumper and a system bonding jumper shall be a wire, bus, screw, or similar suitable conductor.

(A) Material. Equipment bonding jumpers shall be of copper or other corrosion-resistant material. A bonding jumper shall be a wire, bus, screw, or similar suitable conductor.

If not, the op can use steel fittings with aluminum pipe. See 344.14