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Generally no, unless the lug is listed for it. Most terminals in panels and equipment are listed for one conductor only; doubling up is a UL/listing violation and an NEC 110.14(A) issue. The exceptions: - Equipment grounding conductors specifically: 250.148(C) allows more than one EGC under a single terminal only if the terminal is identified (listed and marked) for multiple conductors. - Many square D QO and Homeline panels, for example, allow two EGCs per hole on the ground bar; Eaton BR and CH generally allow one EGC and one grounded (neutral) conductor per hole at the service, but check the label inside the panel door. - Grounded (neutral) conductors always get their own terminal: 408.41. Bottom line: read the torque and wire-count label on the inside of the panel door or the lug itself. If it says "1 wire" or lists only one AWG range per hole, it is one conductor. If it lists two conductors or two AWG ranges, you are good. References: NEC 110.14(A), 250.148(C), 408.41, and the panel or lug manufacturer's listing label.
