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 Battery Testers   Constant Current / Current Sink  
Resistance Meters

 

UL GROUND RESISTANCE TESTER


UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1 ohms.  This resistance must be tested with actual line current in excess or 10 Amps.  The circuit shown uses a couple of LEDs to indicate if in fact the resistance is less than 0.1 ohms.  It uses a modified transformer to produce a 2.5vac output with at least 10 Amps of supply current.

Click on Drawing Below to view PDF version of Schematic

Circuit UL Ground Wire Resistance Tester designed by Dave Johnson, P.E. (Apr 28, 2001)

More   Battery Testers  
Constant Current / Current Sink  
Resistance Meters

 

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