Standard Square D circuit breakers (both QO and Homeline series) are strictly prohibited from being "double-tapped" (connecting two separate conductors under a single terminal screw) unless the specific breaker model is explicitly engineered, labeled, and UL-listed for multi-conductor terminations. Double-tapping an unapproved breaker creates a loose, high-resistance electrical connection that can cause arcing, overheating, terminal degradation, and severe residential fire hazards.
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