What is the maximum voltage to ground allowed in a dwelling unit?

In dwelling units, the maximum voltage to ground typically allowed is set at 150 volts for both safety and compliance with electrical codes. This limit is established to minimize the risk of electrical shock and ensure that the electrical systems used in residential settings are safe for everyday use.

When the voltage to ground exceeds this level, there are increased risks associated with electrical hazards, which can have serious consequences for the safety of occupants. The standard practices and guidelines for residential electrical systems typically adhere to this threshold to maintain a safe environment.

Other voltage limits, such as 120 volts or 240 volts, refer to common service voltages used for outlets and appliances within the dwelling but do not represent the maximum voltage to ground allowed in terms of safety regulations. The 400 volts option exceeds the acceptable limits for residential applications, necessitating more stringent safety measures typical of industrial or commercial electrical systems rather than residential settings.