Some features of domestic electric cooking and heating

Although electric cooking and heating has always been considered possible, it has only recently become popular; hence the engineer is found unprepared with information on the characteristics of the load. From tests made on a number of domestic cooking and heating installations, it would appear that electric cooking has a better load factor than a lighting load and that this load factor improves as the number of ranges increases. The errors incident to these tests are discussed. The demand factors on being plotted against number of ranges appear to follow a logarithmic curve which may be accounted for by the fact that a modification of the law of probability would no doubt determine the probable coincident demand of a number of ranges and that this law is a logarithmic function. Suggestions are made for the checking of these results by others. In the heating field, the effect of water heaters superimposed on range loads is discussed in relation to their effect on the central station loads and income.