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 TM 55-1905-223-24-17
5
Replace defective fuses as required.
(2) Circuit Breakers.
(a) Check circuit breaker as follows:
1
Push manual switch(s) to OFF then ON to be sure breaker is closed. Start all equipment being
fed by breaker. Refer to, FIGURE 2-5.
2
Single Phase-Measure incoming voltage across A-B and leaving voltage across A1-B1. They
should be the same.
3
Three Phase-Measure incoming voltage across A-B, A-C and B-C. Measure leaving voltage
across A1-B1, Al-C1 and B1-C1. Incoming and leaving voltages should be the same.
Figure 2-5. Checking Circuit Breakers.
2-37
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