Originally Posted By: roconnor
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I am with Dan on this one that the major/minor defect description depends on the situation.
A #14 Cu wire double-tapped on a 60A breaker (and other cases where the breaker is oversized for the wire, or there is no breaker protection like a double tap on the main lugs) is a major defect because that wire could fry if overloaded.
Two #14 Cu wires double tapped on a 15A breaker is a defect because the wire-to-wire contact can cause deterioration, but IMHO it's not a major defect since the wires match the breaker.
Also consider that some breakers are made for two wires (e.g. SQ-D 15A/20A breakers) without wire-to-wire contact. Since there is no wire-to-wire contact on these breakers it's not a defect, but if it's connected to circuits that are likely to be heavily loaded it may be "poor practice" due to the possibility of nuisance tripping and a potential for a Harry Homeowner "fix" of upsizing the breaker.
Just my 2-nickles
Robert O'Connor, PE
Eagle Engineering ?
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NACHI Education Committee
I am absolutely amazed sometimes by how much thought goes into doing things wrong