Two Wires, One Screw: What a “Double-Tapped Neutral” Means

Neutral conductors sharing terminal screws at the panel's neutral bus bar, with multiple wires terminated under a single screw instead of one conductor per connection point.

Panels get modified and expanded over the years as homeowners add circuits, and a spare-looking terminal is an easy — if technically improper — place to land the extra wire.

Shared terminals can loosen over time, leading to overheating at the connection point or unreliable current return paths — the kind of slow-building electrical issue that doesn't show symptoms until it does. Most panel manufacturers specify one conductor per terminal, and NEC 408.41 prohibits doubling up neutrals unless a terminal is specifically listed and identified for it.

Have a licensed electrician re-terminate the conductors so each one gets its own screw — usually a straightforward panel repair, not a sign of a bigger system-wide problem.

One of the more frequent panel findings we see, especially in panels that have had circuits added or modified since original construction.