Rjryan
Member
- Location
- Trophy Club, Texas
- Occupation
- Master Electrician
Your right I misused grounded twice.
If you backfeed a bonded system, with even a 120 volts, much less megger voltages, you are creating a dangerous voltage gradient on everything
bonded. If your bonded system crosses your grounded system you will bring everything on the electrical system to a dangerous voltage gradient and damage equipment.
In my opinion a small NEV does the job better because a small voltage (on a bonded system that should offer very little resistance) that voltage. Will have to react better negatively to a point of higher resistance. Less voltage push, means that a small difference in resistance will show very clearly. The NEV does change, but Mike Holt was able to run a complete test in his demonstration without the NEV changing much, because the load on the transform was pretty constant, and I assume if you run the test in a timely manner this will be the same.
If you backfeed a bonded system, with even a 120 volts, much less megger voltages, you are creating a dangerous voltage gradient on everything
bonded. If your bonded system crosses your grounded system you will bring everything on the electrical system to a dangerous voltage gradient and damage equipment.
In my opinion a small NEV does the job better because a small voltage (on a bonded system that should offer very little resistance) that voltage. Will have to react better negatively to a point of higher resistance. Less voltage push, means that a small difference in resistance will show very clearly. The NEV does change, but Mike Holt was able to run a complete test in his demonstration without the NEV changing much, because the load on the transform was pretty constant, and I assume if you run the test in a timely manner this will be the same.