Aluminum 220 to Copper 220?


Old 01-01-06, 04:17 PM
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Aluminum 220 to Copper 220?

We need to extend the wiring for our electric range. My husband bought a 3 ft section of copper wiring and a junction box. When he went to connect the two, he found that the orginal cable is aluminum (which we know is okay for 220), but wants to know if it's okay to wire nut the aluminum to the copper permanently. Thanks!
PS Running new wiring to the circuit breaker box is difficult.
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Old 01-01-06, 04:23 PM
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You will not find twist-on wires nuts rated for use with AL in the size you need. You need a connector rated for both copper (CU) and aluminum (AL).
Polaris connectors are the easiest solution for you. They are a little pricey but save the labor and mess of insulating the splice with tape.

Your junction box will also need to be sized for the number and sizes of wires in it.
Old 01-01-06, 04:38 PM
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If this circuit is 3-wire with no ground you cannot legally make it longer.
Old 01-01-06, 04:48 PM
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You really should replace this circuit all the way back to the panel.

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