How many 12-2 MC cables can be bundled together without having to derate?

In the context of electrical installations, the National Electrical Code (NEC) provides guidelines concerning the bundling of cables to ensure safety and prevent overheating. When multiple conductors are bundled together, there is increased heat generated, which can affect the conductors' ability to carry current. Therefore, there's a need to derate the capacity of the cables once a specific number of them are bundled.

According to the NEC, for non-metallic sheathed cable assemblies, such as 12-2 MC cable, you can bundle up to 20 conductors without needing to derate them. This means that if you have 20 or fewer of these cables grouped together, their current-carrying capacity remains unchanged, thereby allowing them to operate safely within their rating.

Bundling more than 20 conductors requires derating to reduce the likelihood of overheating and to ensure safety standards are met. This highlights the importance of following NEC guidelines to maintain effective electrical system performance and safety in residential or commercial installations.