A one-family dwelling contains an electric range rated at 25 kw. what is the neutral load demand for this range

In the load calculations stipulated in Article 220 of the National Electrical Code, branch circuits must not be undersized for safety purposes. In industrial applications, there are always 'rule of thumbs'. The exact calculations are a product of ideal conditions. But in reality, there are heat losses through the conductor materials. Therefore, it is mandatory that a safety factor should be incorporated. For the calculation of the neutral load, it is a rule of thumb to apply a demand factor of 70% for household electrical appliances like the oven, dryers and cooking ranges. Therefore, the minimum neutral demand load for this range is 25 kW * 0.7 = 17.5 kW.