No, it is not acceptable to run a copper EGC (Equipment Grounding Conductor) with aluminum feeders.Here's why



Different Electrical Properties

Copper and aluminum have different electrical properties, including conductivity and thermal expansion. This difference can lead to galvanic corrosion when the two metals are connected.

Galvanic Corrosion

Galvanic corrosion occurs when two dissimilar metals are in electrical contact and exposed to an electrolyte (such as moisture). The more active metal (in this case, aluminum) will corrode, weakening the connection and potentially creating a safety hazard.

Code Violations

The National Electrical Code (NEC) requires that EGCs be of the same material as the circuit conductors. For aluminum feeders, this means using an aluminum EGC.

Consequences of Using Copper EGC with Aluminum Feeders



Safety Hazard

Galvanic corrosion can damage the EGC, compromising the electrical safety of the system and increasing the risk of electrical shock or fire.

Code Violation

Using a copper EGC with aluminum feeders violates the NEC and can result in failed inspections or insurance claims being denied.

Increased Corrosion

The presence of a copper EGC in contact with aluminum feeders accelerates the corrosion process.

Alternative Options



Use Aluminum EGC

Purchase an aluminum EGC of the same size as the aluminum feeders.

Install a Copper-to-Aluminum Transition Fitting: In certain situations, it may be possible to use a copper-to-aluminum transition fitting to connect a copper EGC to aluminum feeders. However, these fittings must be listed for the specific purpose and installed according to the manufacturer's instructions.It is crucial to follow proper electrical practices and adhere to code requirements to ensure the safety and reliability of the electrical system. Flag for review