We are installing 2 - 3 phase UPS modules in parallel to a common SBM. The manufacturer of the UPS is requiring a neutral being pulled in each of 4 parallel feeders from the UPS to the SBM. This neutral will not be bonded and will carry no load as all loads are 3 phase 3 wire. This neutral is...
This question is in regard to how voltage drop is calclated for a circuit from a distribution panelboard. I know how the calculation is done and that it needs to be no more than 3%. My issue is an electrical engineer that does not understand how to calculate the voltage drop for a circuit. He...
In a transportation tunnel we are building we have installed a grounding grid under the concrete slab. Prior to pouring the concrete a waterproofing membrane was applied on top of the sub soil. The grounding conductor is stubbed up through the waterproofing membrane to be attached to the rail...
We are testing a large ground grid, approximately 400 feet by 200 feet using the fall of potential slope method with the C2 electrode distance of 500 feet from the test point of the grid. Attached is the test report for the grounding system with noted results. We have been told this is not a...
I have heard differing opinions on whether or not to Hi-Pot test service aged medium voltage cable. What are the NETA standards in regard to this. These cables are approximately 3 years old at 13.2 kV.
