Electrical news and engineering . bill would no doubt be questioned. The costof this method varies from $ to $ 3. The use of a graphic meter. This arrangementgives accurate results. The cost varies from $ to $ 4. An indicating meter giving accurate results andcosting .$ to $ From the point oif view of the cost and accuracy, thechoice, therefore, rests between 3 and 4. Method 3 shoufd be chosen where a graphic record isrequired or justified. Generally speaking, on 100 horse power,or over, the expense is warranted. Method 4 is preferab
Electrical news and engineering . bill would no doubt be questioned. The costof this method varies from $ to $ 3. The use of a graphic meter. This arrangementgives accurate results. The cost varies from $ to $ 4. An indicating meter giving accurate results andcosting .$ to $ From the point oif view of the cost and accuracy, thechoice, therefore, rests between 3 and 4. Method 3 shoufd be chosen where a graphic record isrequired or justified. Generally speaking, on 100 horse power,or over, the expense is warranted. Method 4 is preferablewhere a graphic record is not justified. We have arrived at the point where the instrumentsavailable make it highly desirable that both large and smallcustomers lie measured in It is now well, perhaps torun over rapidly what is meant by In a direct current circuit, kilowatts are tlic same as kilo-volt amperes. In an alternating current circuit, this usuallyis not the case, because the question of power factor comes. in. In this case watts are equal to volts multiplied by powerfactor (which is always less than one) whereas the volt am-peres are product of the volts by amperes, neglecting thepower factor. Therefore, a volt ampere reading is than a watt reading. There are two types of graphic meters for on the market. The Instantaneously Responding Meter Instrument A is of the instantaneously respondingtype. It has the advantage oif reading on balanced loadsat any power factor but penalizes the customer on unbalancedloads. It is a question whether this is a desirable feature ornot. The Standard Interpretation of Rates and Contractsby the H. E. P. C. at present existing, do not permit of apenalty for unbalance. Therefore this instrument should notbe used unless it is known that the load is balanced. This instrument has the standard form of metering discssuch as are found in an integrating watthour meter. .?Xn in-tegrating wattmeter
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