Different size wires under one lug

Anyone have a good narrative for this? Can’t believe InterNachi narratives don’t cover this.

The doubled neutrals are a larger concern than the (allowed) doubled grounds (some with different sized conductors).

page 11, etc.

how about the neutral and ground under the same lug (right side)? Neutrals are supposed to be in a terminal by themselves correct?

Double tapped breaker(s),double lugged neutrals and grounds inside panel box (more than one electrical conductor attached). This is not standard practice, and may cause overheating or even an electrical fire. Recommend evaluation by an licensed electrician.

“Double tapping and lugging can create hot spots on breakers and neutral bars because they are not tightened to the correct torque–especially if two different size conductors are used. Because the hot [black] and neutral [white]wires are both current carrying conductors, the chance is then greater for potential hot spots. If the double tap or lug becomes loose, it begins to arc. As it arcs it builds up carbon. Carbon is then resistance and with more carbon buildup the more difficult it is for the conductor to make contact, thus increasing the current. The end result can be the breaker tripping because of the loose connection [current exceeding the rating of the breaker], or signs of overheating such as discolored wires, melted wires, etc, or even fire.”


Most neutral bars holes are listed for two or three EGC’s, neutrals require a separate hole per conductor.

I can’t either because I remember writing it. Here it is again.

Multiple neutrals 1 hole
In the service panel, multiple neutral conductors were installed in a single hole in a bus bar. This condition is improper. Widely-accepted common safety standards mandate that only one neutral conductor terminate in each hole in a bus bar. The Inspector recommends correction by a qualified electrical contractor”

Not sure what you are referring to when you say safety standards, but this is an electrical code requirement as well as being part of the UL listing information.