What is the minimum calculated service load for 20-12 KW electric ranges installed in dwelling units?

The minimum calculated service load for 20-12 KW electric ranges installed in dwelling units is set based on the National Electrical Code (NEC) guidelines, which aim to ensure safety and proper functioning of electrical systems in residential settings. In this context, the correct answer of 35 KW reflects the specific requirements for the load capacity that must be available to adequately support these types of appliances.

When calculating service loads for electric ranges, the NEC provides standards to accommodate not only the wattage of the appliances but also considers diversity and demand factors, which help in estimating realistic loading conditions in residential usage. The 35 KW figure is derived from the NEC’s provisions that accommodate multiple ranges, taking into account their operational characteristics and maximal potential usage.

The other figures—40 KW, 30 KW, and 32 KW—do not align with the established codes for the minimum calculated load for such installations in dwelling units, showing that they either overestimate or underestimate what is adequate for safe and efficient operation. Understanding this standard is crucial for ensuring compliance with electrical codes and for the safety of electrical installations in homes.