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58 RICHARDSON'S BLUEBOOK OF PROJECTION
Calculating Voltage Drop, page 66
19. How do you calculate voltage drop?
How to Measure Wires, page 67
20 In what form is the cross section area of wires expressed ?
_ 2l' To what is the area of cross section of round w.res equal r
22 How may current capacity of any round commercial copper
wire be determined? . .,o^- ---.<*_
23. Is it the slots or round holes of B. & S. gauges that are used for measuring wires ? _.-24. Explain markings on these gauges.
Insulation, page 68
25. What is the purpose of insulation?
26.
Is there any known substance through which a substantial Amount of Current cannot, be forced if voltage is sum
ciently high? . ,
27. Name -some of the substances that are used as insulators for ordinary commercial voltage.
28 Of what does rubber covered wire insulation consist.
29 Is rubber insulation easily injured by heat or oil?, * __ __
30 Why are rubber covered wires limited to a lower amperage capacity than wires having other insulations?-*
31 Is there a fireproof insulation for inside work?
32. Name specifications for wires to be installed in conduit.
Wire Systems, page 70
33. Resolved to fundamentals,do all systems constitute 2-wire circuits?
34 Mav circuits be attached to a wire system at any point " charged with voltage proper for the equipment to be oper
ated? , ,
35 Upon what basic principle do 3-wire systems depend for
operation? J5s*
36 If two 110 volt generators are properly connected tc ยป a 3-wiTe system, what voltage will the outside wires have? &