How many volts are typically found in Romex wires and MC cable?

Romex wires and MC (metal-clad) cables are commonly used for residential and light commercial electrical installations in North America. The standard household electrical voltage in these situations is typically around 120 volts. This is the voltage level most often supplied to wall outlets for general use, which is why it is associated with Romex wiring, particularly for lighting circuits and standard outlets in homes.

While 240 volts is also used in some applications (like for larger appliances), the standard voltage for typical wiring within residential settings, where Romex is frequently employed, is 120 volts. The answer of 110 volts represents an older voltage standard that has largely been phased out in favor of 120 volts.

220 volts is more commonly referenced in industrial applications or specific circuit configurations, but it does not apply to the standard wiring typically encountered in residential electrical systems.

Thus, stating that the correct voltage is 110 volts would be less accurate for current standards, making 120 volts the more appropriate voltage for these types of wiring.