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Show 5. To check the red and black wires, for example, the man at the top of the mountain shorts the red to the black wire. The other man connects the meter to the black and red wires and notes the reading from the appropriate scale. 6. If the meter shows no reading, the line is broken ( open circuit). Checks must be made between junction boxes to locate the break. 7. If there had been a reading when the wires were shorted, the meter should return to zero when the short is removed. If it does not, the wires are shorted some place between the base area and the top of the mountain. Use the same method described in 5 to check between the junction boxes until the short is found and fixed. 8. If the meter returned to zero when the short was removed, leave one of the meter leads attached ( for example, to the black wire) and move the other lead to another wire. 9. There should be no reading until the man on the mountain shorts the two wires being tested. After the short is made on top of the mountain, the meter reading should be recorded. It should be the same as that found in step 5. If there is a reading on the meter before the short is made on top of the mountain, there is an accidental short in the line. Record the reading and compare to the one found in step 5. The closer the accidental short is to the top of the mountain, the closer this reading will be to that for the full wire found in 5. 10. Check all the wires this way to be sure all are continuous and free of shorts. 72 |
