When a connector is marked with "al-cu," the connector is suitable for use with copper, copper-clad aluminum, and aluminum conductors?

When connectors are marked with a combination of metals, it can be used as a connector of one of the metals or an alloy of the two metals. So in this case, since the marking is “Al – Cu” where Al is aluminium and Cu is copper, therefore the answer is:

Yes, it is suitable for use with copper, copper-clad aluminum, and aluminum conductors.

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