Kommentar eines absoluten Laien auf dem Gebiet:

Der Text auf dieser Firmenseite spricht zunächst dafür, dass es sich inhaltlich um identische Dinge handelt:

Neutral Grounding Resistor (NGR) NGR or NER is an equipment which is used to protect transformers or generators by installing on the null-earth connection path. The main purpose of installing this equipment is to limit the maximum earth fault current,

ner – Paarsun Co.

Aber vgl.

There are five types of neutral earthing:[21]

• Solid-earthed neutral
• Unearthed neutral
• Resistance-earthed neutral
• Low-resistance earthing
• High-resistance earthing
• Reactance-earthed neutral

▷ Secret Bases · Earthing system (secret-bases.co.uk)

Edit:

Identität ergibt sich aus diesem Satz:

Neutral Earthing Resistors (NER's) sometimes referred to as Neutral Grounding Resistors (NGR's) by our American cousins, are used in distribution networks to limit the current flowing through the neutral point of a transformer or generator in the event of an earth fault.

DORNEL ltd5