Is the installation of branch circuits from an autotransformer allowed under the code?

The installation of branch circuits from an autotransformer is permitted under the National Electrical Code (NEC), provided that specific installation standards and safety requirements are met. Autotransformers are often employed to step down or step up voltages while maintaining a smaller footprint compared to traditional transformers. The NEC allows their use when the necessary overcurrent protection, disconnect means, and grounding provisions are in place to ensure safety and compliance.

Using autotransformers can enhance efficiency in certain applications, particularly where voltage adjustments are needed without the complications of larger transformers. Additionally, the NEC outlines conditions under which branch circuits can be derived from autotransformers, emphasizing compliance with all relevant safety practices and code requirements.

The mention of restrictions or limitations in other choices does not negate the fact that, under compliant circumstances, such installations are indeed permissible. This compliance is key to ensuring reliable and safe electrical installations, which ultimately supports the widespread acceptance and application of autotransformer systems in electrical work.