[Electric engineering.] . ters rules for that size of wire. In determiningthe size of wire from these diagrams, do not use the dottedportions of the curves. If a point should come near oneof the dotted sections, use the next larger size of Avire. To use such a diagram, find the point where the lines rep-resenting amperes and given distance intersect, and take thewire indicated by the wire line nearest this point. Unlessthe wire line is very close, take the larger wire of the twolines on each side of the intersection point. For example, to find the wire required for 7 volts lossin a distance of
[Electric engineering.] . ters rules for that size of wire. In determiningthe size of wire from these diagrams, do not use the dottedportions of the curves. If a point should come near oneof the dotted sections, use the next larger size of Avire. To use such a diagram, find the point where the lines rep-resenting amperes and given distance intersect, and take thewire indicated by the wire line nearest this point. Unlessthe wire line is very close, take the larger wire of the twolines on each side of the intersection point. For example, to find the wire required for 7 volts lossin a distance of 125 feet, with 21 amperes, we divide21 by 7, which gives 3; where the line of 3 amperes inter-sects the line of 125 feet, we are between the lines repre-senting No. 10 and No. 12 wire. The point lies aboutmidway between the two curves, and hence we use thelarger size of wire, No. 10. 12 INTERIOR WIRING. 27 14. In calculating the sizes of wires for 52-, 104-, 220-,or 250-volt work, or for any intermediate voltage, it must. < -LrloA 3NO JO doyQ 3AIO O- (AVM 3NO) -L33-J Nl ] #- be borne in mind that lamps burning on lower voltages than110 take more current, and those burning on higher volt-ages take less current. An ampere per lamp for 52-voltlamps, | ampere per lamp for 104- or 110-volt lamps, and §27 INTERIOR WIRING. 13 .3 ampere per lamp for 220-volt lamps is a safe basis for cal-culations where good lamps are used. Also, it must be
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