What might happen when multiple nonmetallic-sheathed cables are bundled together?

When multiple nonmetallic-sheathed cables are bundled together, one possible outcome is nuisance tripping. This phenomenon occurs because the heat generated by the conductors within the cables can accumulate when they are tightly grouped. Each cable radiates heat, and if this heat cannot adequately dissipate into the surrounding air, it can cause the temperature of the cables to rise. This temperature increase might lead to circuit breakers tripping or fuses blowing unnecessarily, as the protective devices respond to the higher temperatures that may present a risk of overheating or fire.

Other potential outcomes, such as improved flexibility or increased ampacity, would not typically result from bundling the cables, as flexing often becomes more difficult with a larger grouping, and ampacity could actually be reduced rather than increased due to the thermal buildup. Additionally, reduced thermal insulation does not accurately describe what happens in this scenario since the thermal insulation properties of the cables would remain consistent regardless of how they are grouped together. Thus, nuisance tripping is a valid concern when multiple nonmetallic-sheathed cables are bundled.