When installing a 3-wire single phase 240 volt circuit consisting of red and black wire, which would you connect to hot?

In a 3-wire single-phase 240-volt circuit, the red and black wires are typically used as the two hot conductors. This configuration allows for the circuit to provide the required voltage to operate larger appliances or equipment that need more power than a standard 120-volt circuit offers.

Connecting both the red and black wires to hot is essential because this ensures that the circuit has a proper voltage difference (240 volts) between the two wires. In residential electrical systems, the use of these two hot wires allows for devices to be run that require more power, such as electric dryers or ovens, which cannot operate effectively on a 120-volt circuit alone.

This setup is grounded in the National Electrical Code (NEC) standards, which dictate proper wiring practices. By correctly utilizing both hot wires, a contractor can ensure safety and efficiency in the electrical installation. It is important to follow all local codes and regulations, as well as manufacturer specifications, when wiring or configuring electrical systems.