I forgot my password.
Don't have an account?
what is NGR and what for?
Many, many discussions on CR4 regarding Neutral Ground Resistor.
http://cr4.globalspec.com/thread/51653 for one. For others, "Search all of CR4" on the right hand margin for 'NGR'.
See post #1 and also try NER (Neutral Earthing Resistor) as they go by this name also.