. Electrical news and engineering. customer. Unfortunatelythis is not always the case, and the effect on the customer iseasily illustrated by an actual example. Presume that thenormal requirements of the customer caller for 100 Inone particular district of Canada the service charge as shownby a maximum demand meter is .$ per per month. 34 THE ELECT The meter charge is: The first 50 hums use at ; the sec-ond 50 hours use at ; the balance at Assuming thatthe customer runs 10 hours per day on the unrestricted basis,his bill would be subject to discount of 10 per cent, cas
. Electrical news and engineering. customer. Unfortunatelythis is not always the case, and the effect on the customer iseasily illustrated by an actual example. Presume that thenormal requirements of the customer caller for 100 Inone particular district of Canada the service charge as shownby a maximum demand meter is .$ per per month. 34 THE ELECT The meter charge is: The first 50 hums use at ; the sec-ond 50 hours use at ; the balance at Assuming thatthe customer runs 10 hours per day on the unrestricted basis,his bill would be subject to discount of 10 per cent, cash,and would read as follows: Service charge— lOO H. Consumption charge— First 50 hours (75 kw. .K 50)=3750 at :i.(i $ Second 50 hours =3750 at $ Balance, 150 hours =8350 at .15 $ Total 15750 $ Cash discount $ Net Bill *349-66 For a load of less than 300 the peak is taken at oneminute. Therefore if once during a month, due to carelessness RICAL NEWS June 15, 1918. ment, time lagging element, bell ringing transformer andbell. The current element is built with a standard of 5 amperewinding for use with the transformer. It is capable of ad-justment to the required lead by means of the steps of therheostat, from to 5 amps. The time element has a range in the instrument shown,from 0 to 5 minutes. The time range can, however, be ar-ranged for any particular requirements by a slight changein the gearing. The method of operation is as follows: The current element is set to the maximum load requir-ed during the month and the time element slightly under themaximum permitted by the power contract for the aboveamount of power. When the current rises to or above theset maximum, the current element immediately operates,throwing current on to the time element. This element thenoperates until the time setting is reached, when the bell ringsout a warning that the load is excessive. The constructionof the instrument is such
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