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This is use to locate the ground fault of a single cable. This test is performed with the aid of a low voltage supply with an ammeter or voltmeter. In this test the resistance between one end of the cable C1 and the earth is first measured with the other end, C2 isolated to earth and then with the C2 earthed. Let the two readings be represented by R1 and R2 rep! If r1 and r2 are the conductor resistance of the length of cable at C2 to fault and at C1 to fault rep!, and "r" is the resistance of the fault to earth
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What tester is using to check continuity of cable?
You use an ohm meter to check for continuty, low ohm reading, on the center pin between the two ends of the cable. You would then check for continuity between the shield, or outside connector. If both of those are good, you should also check between one of the center pins and the shield to ensure their isn't a short on the cable.
What is the use of check zone in bus bar protection?
It provides stability in case of problems with disconnectors auxiliary contacts (stuck contacts or wiring problems). Ir relies on the feeder currents in the busbar. Disconnectors positions are not required. There is no selectivity using check zone. It's usefully because it prevents external faults to be considered as a busbar fault.
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How a check digit is calculated?
Check digits are determined (or derived) by a set algorithm using the digits of the account number.
Is megger testing a dc applied voltage to a circuit to check a short within a path of the wiring?
Usually a megaohmeter (or megger) is used to test high current feeder wires for ground faults before they are landed on a transformer.
