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Yes as long as they are in a romex style wire. Like 12-2 for example. Which is individual wires incased in an outer jacket. You should never have just single wires running in the attic unprotected or anywhere for that matter. Individual wires must be in a conduit. And any splices should be in a box.

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Q: Is it all right to cover electric wires with insulation in attic?
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