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A good number on a megger test should be around 2 megohms.
A good number on a megger test should be around 2 megohms.
Megger is usually short for Mega Ohm Meter. It measures high values of resistance with good accuracy. Most often used to test insulation.
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Meggers send voltage thru the cables to determine the resistance between, meggers like the mj145 have multiple settings from 100 volts to 1000v, a Megger showing a good reading will show megaohms thru its full band, a bad one reading will be indicated by it either reading 0 ohms or less then 30 ohms (depends on the circuit and what's between the wires) a bad indicator can also be a steady reading at low voltage then at higher voltage it spikes to a low ohm, or a low voltage, like as if u just created a short. What that shows is at low voltage your insulator is fine, but at high voltage it blows thru it, normally that means your Insolator around your wire is damaged.
Briefly, a megger test is testing an electric circuit at load. The circuit might prove good at normal resistance measuring but fails when applying high voltage. Read the megger result correctly, every electric circuit will fail if stressed high enough. Disconnect any servo drive or frequency controller before testing.
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If the service is connected you can not megger the service ahead of the main breaker. If the service is waiting for connection all you can do is megger between the wires. As the underground service is installed in PVC conduit, no ground circuit will be available between the underground conductors and the PVC conduit. Connect the black lead to the neutral bar in the meter base. Connect the other lead to the L1 lead and ring it. Do the same to the L2 lead. Then disconnect the lead from the neutral bar in the meter base and connect it to L1. Connect the other lead to L2 if it is not still connected from the last operation. Ring the line between L1 and L2. If you get a reading of infinity on all three tests then the service is good for connection.
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