What is the term used in the NEC® to refer to the "hot" conductor of a circuit?

In the National Electrical Code (NEC), the term "ungrounded" is used to refer to the "hot" conductor of a circuit. This designation means that the conductor carries current and is not connected to the ground, making it capable of being at a higher voltage relative to ground potential. In most electrical systems, ungrounded conductors are the ones that deliver power to loads, whereas grounded and neutral conductors serve different roles in the system.

The grounded conductor refers to the neutral, which is intended to carry current only under normal operation. In contrast, the ungrounded conductor can be energized and should be treated with caution as it poses a shock hazard.

The term "isolated" does not apply in this context, as it typically relates to conductors or systems designed to prevent unintended connections or interactions. Understanding these terms and their implications in electrical safety and design is crucial for anyone working in the electrical field.