🛡️ IEEE 142 (HRG 5A Continuous vs Low-Resistance LRG 200-400A 10-Second Rating)

Neutral Grounding Resistor (NGR) Calculator

Size Neutral Grounding Resistors (NGR) for industrial medium and low-voltage power systems under IEEE 142 (Green Book) & IEEE C57.32: calculate continuous resistance Ohms and thermal energy ratings (High-Resistance Grounding HRG 5A continuous to prevent arc flash flashovers while allowing continuous process operation vs LRG 200-400A 10-second trip), and NGR profits.

1. Project & Operating Inputs

Substation Transformers Equipped with NGR (Transformer Count e.g. 6 Units)

System Line-to-Neutral Voltage (Volts e.g. 277V for 480V System or 2,400V)

Customer Bid Price for Supplied & Connected NGR Packages ($ / Unit)

Stainless Steel Resistor Grid, Sensing Resistor, Ground Monitor & Tech ($)

2. Financial Breakdown & Yield

IEEE 142 NEUTRAL GROUNDING

Turnkey NGR Package Profit

Industrial Power System Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost