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On the whole megger testing is non destructive. What happens is a DC voltage is applied to the device or winding under test. It is an insulation test to see is the insulation has been injured in any way to cause a short circuit when normal power is applied to it. On my megger there are 3 ranges 300V, 750V, and 1000 volts. Applying the proper voltage is essential to not damaging the device you are testing. Working voltages up to 240 volts should use the 300 range. Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range. As you can see if you used the 1000 volt range on a device that had a working voltage of say 24 volts you could damage the insulation just by testing it. So meggering a device is non destructive if you use the tester as its instructions tell you to. To megger a cable connect one lead to the ground or outside sheath of the cable and the other to the inside wires one at a time. Test each wire separately. Then for a wire to wire test connect the meter across two of the conductors and test. For a three wire cable, test 1 to 2, 2 to 3, and then 3 to 1.
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoA megger test is used to check the insulation factor of wires or devices. This is to make sure that when the working voltage is applied, a short circuit to ground will not occur due to a problem with the insulation of the device or wire.
On the whole megger testing is non destructive. What happens is a DC voltage is applied to the device or winding under test. It is an insulation test to see is the insulation has been injured in any way to cause a short circuit when normal power is applied to it. On my megger there are 3 ranges 300V, 750V, and 1000 volts. Applying the proper voltage is essential to not damaging the device you are testing. Working voltages up to 240 volts should use the 300 range. Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range. As you can see if you used the 1000 volt range on a device that had a working voltage of say 24 volts you could damage the insulation just by testing it. So meggering a device is non destructive if you use the tester as its instructions tell you to.
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∙ 9y agoyes
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How much volt apply to instrument cable meggering?
500v
Why MICC cables are meggering?
since the MICC cable the isolation between core is less as well as the outer sheath has probability of getting damaged during installation so meggering is important Any clarification mail to amal_elias@ymail.com
Why is AC meggering not used?
You do not use AC to megger a device, because the purpose of meggering is to measure the insulation resistance of the device. You use DC to do that. If you used AC, you would be unable to differentiate between insulation leakage and capacitance.
What is a cable gland?
A cable gland is a connector which holds the end of a cable in place.
What is a load cable?
Load cable generally means the final cable before the actual load. So on a clothes dryer the "Load Cable" would be the cable running from the outlet to the actual clothes dryer.
How much volt apply to instrument cable meggering?
500v
Can you use ac supply for cable meggering?
No. The cable has capacitance, and an AC source would not be able to distinguish between capacitance and leakage.
Why ac megger not use in cable meggering?
Because the cable has capacitance, and an AC source would not be able to distinguish between capacitance and leakage.
Why MICC cables are meggering?
since the MICC cable the isolation between core is less as well as the outer sheath has probability of getting damaged during installation so meggering is important Any clarification mail to amal_elias@ymail.com
Where can you get on line IEEE standard for 600 volts cable testing?
You can try the IEEE website, but for any good, useful info from them, you have to be a member. Have you tried the NEC (book, or online) for info on 600V cable testing? I would think that a basic "Meggering", and/or "High-Pot" testing of the cable would suffice.
Why is AC meggering not used?
You do not use AC to megger a device, because the purpose of meggering is to measure the insulation resistance of the device. You use DC to do that. If you used AC, you would be unable to differentiate between insulation leakage and capacitance.
When using a megger at 1000v and your reading is 2700 megohms is it a problem?
What is the acepable rating on a #3 wire when meggering @1000v
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