NGT and NGR

Green

The difference is:

NGT is down $0.23 today (as of 12:38PM Central Standard Time) and is publicly traded

NGR is not publicly traded.

NGR = Neutral Grounding Resistor

NGT = Neutral Grounding Transformer

These are two different things and are used for different purposes. One is not the comparable to or substitute of other. See these threads for the detail about NGR and NGT:

For NGR, see http://cr4.globalspec.com/thread/56612/Neutral-Grounding-Resistor

For NGT, see http://cr4.globalspec.com/thread/36828/What-is-Earthing-Transformer

- MS

For Low Resistance Earthing go for NGR (Neutral Grounding Resistor) and for High Resistance Grounding go for NGT (Neutral Grounding Transformer) with a low value resistance connected across the NGT Secondary.