As other said, a megger at any voltage Will not give you an accurate low ohm reading, some do have a low ohm scale as my megger brand does but unless it has this feature it will not tell you how much ohms the resistance is when below a few hundreds of thousands of ohms , they are design and calibrated to read in the millions of ohms range, to test a conductor for continuity you need a ohm meter that will read in the very low ohm range which many multi-meters can do very accurately, if you suspect a break in the conductor then you can use a megger to see if there is leakage to ground or to another conductor in the same run which will tell you if there is a fault to ground or the other conductor this is helpful when you have an underground circuit that randomly faults a fuse or breaker but a regular ohm meter wont show it because it is only is using a 9 volt battery.
Originally Posted by gk351
Like I said above you should be using your megger to check between the subject conductor and Earth, if you have leakage then you know you have a bad conductor, not just from one end but both ends, I would bet if this is a 240 volt circuit then the 85 volts your getting is an open conductor that you seeing the voltage return through Earth at the load end which the megger will prove when you check it to earth.
The Fluke T5-600 is only a 1k ohm meter, it doesn't place a load on the circuit so it will read phantom voltages so be careful as this can through you off, its not a good meter to trouble shoot ohm readings with as it is a basic meter, it will though tell you if your wire is good if you can read from one end to the other as it should be less then 5 ohms depending upon how long a run it is, but for under ground wiring problems a megger is your best friend if you know how to use one?
Last edited by hurk27; 08-06-13 at 11:08 PM.
Wayne A. From: N.W.Indiana
Be Fair, Be Safe
Just don't be fairly safe