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LINE POWER SUPPLY Cli 101
of Generator A through neutral wire C to J. thus pro viding J with its 10 ampen
(5) On the other hand, suppose L to have 11 ohms resistance and J 22 ohms. Ten amperes from Generator B then would flow through L, five returning through the neutral while the other five amperes complete their course through J.
(6) Neither of the two conditions just described is desirable. A three-wire Edison circuit should he. as far as possible, so balanced that no current Rows in the neutral; that is to say, the current required by I . and N in parallel should be as nearly as possible equal to the current requirement of all apparatus connected between win and D. If an exact balance can be obtained there will be no current at all in the neutral, and the neutral fuse might be removed without affecting the circuit. Under that ideal condition, the ammeter in Fig. 44 would read zer< •
(7) To obtain the desired balance, connections are interchanged at the projection room switchboard. Sup pose, for example. I and J each require 6 amperes and K. L and N each four amperes. Then the current between C and D is 16 amperes, while that between C and E is 8 amperes, hence eight amperes of balance current will flow in the neutral. If, however, K be disconnected from C-D and wired to C-E (placing K in parallel with L and N instead of as drawn) then K, L and X together will need 12 amperes, I and J together will need twelve amperes, therefore the system will be perfectly balanced, and the neutral current will be zero, which is a perfect condition. The 220-volt motor, M, has no connection with the neutral, hence the current through it has nothing to do with the balance of the system.
• (8) Power companies encourage their customers to keep Edison 3-wire systems balanced because if their customers will do that the strain on their generators. A and B, will be more nearly equal and they can use a small wire for their neutral. Encouragement is sometime given in the form of more favorable rates, or of penalty rati cases of unbalance. The projectionist who neglects to balance his Edison 3-wire projection room circuit so tar