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Sensors / Detectors:
Resistance Meters
Sensors / Detectors -- Main Page
Last Updated on:
Friday, October 16, 2009 03:42 AM |
| Circuits Designed
by Dave Johnson, P.E. : |
- 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.
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