When several AC, MC, or NMC cables are installed next to each other in a bundle, the conductors in the cables are able to carry ___ current than if the cables were separated.

When several AC, MC, or NMC cables are installed next to each other in a bundle, the ability of the conductors within those cables to carry current is impacted by the phenomenon known as "heat buildup." In a bundled installation, the cables generate heat due to the current flowing through their conductors. When cables are separated, there is better air circulation around each cable, allowing heat to dissipate more effectively. However, when cables are bundled tightly together, the heat cannot escape as easily, leading to an increase in the temperature of the conductors.

As temperature rises, the resistance of the conductors also increases, which can affect the performance of the cables. Consequently, the conductors in the bundled cables can safely carry less current than they would if they were installed separately. This holds true for both power loss and potential overheating risks, which necessitate derating the current-carrying capacity when cables are installed in close proximity to one another. Thus, the correct conclusion is that the conductors in the cables are able to carry less current than if the cables were separated.