Double-tapped breaker

What is Double-tapped breaker?

Double tapping is one of the most frequently reported electrical findings. Most residential breakers are listed to accept a single conductor; putting two under one screw means neither is reliably clamped, and a loose connection under load generates heat. A small number of breakers — certain Square D QO models, for example — are specifically listed for two conductors, so the finding is not automatic and the breaker labelling should be read. Correction is straightforward: a qualified electrician either adds a circuit, installs a listed tandem breaker where the panel permits, or pigtails the conductors. Related findings include double-lugged neutrals on the neutral bar, which is likewise generally not permitted.