How many volts are present in Romex wires and MC cable?

Romex wires and MC (metal-clad) cables are typically used in residential and light commercial wiring applications in North America. The standard voltage for general circuits in residential settings is 120 volts. This voltage is commonly used for lighting, outlets, and many household appliances.

While the voltage in the options includes both 110 V and 120 V, the term "110 V" often historically refers to household electrical systems that are, in practice, now commonly rated at 120 V. Therefore, when considering the most accurate representation of the voltage supplied in these cables, 120 V is generally accepted as the nominal value.

The choice of 110 V may be outdated or overly simplistic, as voltages can fluctuate slightly due to regulatory standards and practical distribution environments. However, since 120 V is the realworld standard measurement and is the value that most electrical testing devices will indicate in actual use, the reference to 110 V indicates a more historical context of voltage.

In summary, for Romex wires and MC cable, 120 V is the correct and commonly understood operating voltage, as it aligns with modern electrical standards and usage in typical installation scenarios.