AEMC 6422 Ground Resistance Tester

AEMC 6422 Ground Resistance Tester Hazmat Resource
Digital Ground Resistance Meter Hazmat Resource
AEMC Instruments Ground Tester Hazmat Resource
Earth Ground Tester Kit Hazmat Resource

AEMC 6422 Ground Resistance Tester

$670.00

The AEMC 6422 Ground Resistance Tester performs resistance and 3-pole ground resistance measurements with automatic range selection. Designed for quick setup by connecting the leads, press to measure and read the results on the large LCD screen.

Meets Cal OES MEL 3.2.9.3 requirements (see below)

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Description

The AEMC 6422 Ground Resistance Tester is a reliable and easy-to-use tool designed for precise ground resistance measurements. Whether you’re testing electrical grounding in industrial, commercial, or residential settings, this auto-ranging device ensures accuracy and efficiency with minimal effort.

Features

  • Simple one-button operation minimizes testing errors.
  • Test button turns green when readings stabilize.
  • Supports 2P resistance up to 50 kΩ and 3P ground resistance up to 2 kΩ (Model 6422) or 50 kΩ (Model 6424).
  • Large backlit digital display ensures readability in any lighting.
  • Automatic hold function retains the last stable measurement.
  • Auto-selects test frequency between 128 Hz and 256 Hz for stability.
  • Powers up in 2P mode and verifies injector lead connection with H auxiliary rod.
  • Stores three measurements with average and percentage deviation for validation.c
  • Test lead compensation enhances low-resistance measurement accuracy.
  • CAT IV 600V rating ensures high safety standards.
  • Model 6424 also detects AC/DC voltage, stores 52%, 62%, and 72% measurements, measures leakage current from 0.5 mA to 60 A, and recharges via AC, USB, or vehicle DC port.
  • Color-coded leads and terminals enable quick, error-free connections.
  • Detects hazardous voltage and prevents unsafe measurements.
  • Fully functional even when wearing work gloves.
  • Rugged, water-resistant design for all-terrain use.
  • Built-in display stand improves visibility when placed on the ground.

Choosing the Right Ground Resistance Tester
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Understanding Ground Resistance Testing
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Digital Ground Resistance Meter

Hazardous material sites, such as fuel storage depots, chemical manufacturing plants, and waste disposal facilities, require strict grounding procedures to eliminate static electricity buildup that could ignite combustible substances.

Ideal applications for the AEMC Instruments ground tester:
  • Oil & Gas Industry
  • Chemical Plants & Laboratories
  • Hazardous Waste Disposal Facilities
  • Firefighting & Emergency Response Team
  • Agricultural & Food Processing

Ground Resistance Tester Manual PDF Brochure AEMC Model 6422 Datasheet PDF Brochure
Ground Resistance Tester Manual PDF AEMC Model 6422 Datasheet PDF

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Earth Ground Testers

Hazardous locations classified as Class I, II, and III (according to NEC and ATEX standards) demand strict control over electrical grounding to prevent arc flashes, sparking, and stray voltage issues. The Model 6422’s hazardous voltage detection feature provides an automatic warning when unsafe voltage is present, preventing measurements in dangerous conditions. The earth ground tester kit is especially critical for industries such as petrochemicals, pharmaceuticals, and grain processing, where airborne dust, vapors, or gases create a heightened risk of explosion.

Cal OES MEL List – Firescope Hazardous Materials Minimum Equipment List (MEL)

This product meets the requirements for the Firescope MEL List. To see all of the MEL products that HAZMAT Resource provides, visit our California MEL List page >>

Cal OES MEL 3.2.9.3 GROUND RESISTANCE AND BONDING VERIFICATION DETECTION CAPABILITY: Analog or digital readout, Intrinsically Safe, range of at least 0 – 200 ohm, 3-wire resistance hookup minimum.

One Capability: Ground resistance and bonding detection may require two separate units. Required for Type 1 and Type 2 teams Optional for Type 3.

Compliant To: NEC Article 250 And NFPA 70 NFPA 77

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Ground Resistance Tester Model 6422 (Digital, 3-Point)

What is the maximum resistance to ground?
The recommended maximum grounding resistance is 0.5 ohms (Ω). However, the ideal ground resistance is zero ohms.
 
Explanation
  • Grounding resistance is the sum of the resistance of the grounding body, the soil, and the contact between the two.
  • The goal is to have the lowest ground resistance that is economically and physically reasonable.
  • The National Fire Protection Association (NFPA) and IEEE recommend a ground resistance of 5.0 ohms or less.
  • The National Electric Code (NEC) recommends a system impedance to ground of 25.0 ohms or less.
  • Facilities with sensitive equipment should have a ground resistance of 5.0 ohms or less.
  • A low-impedance ground electrode can help minimize damage during a lightning strike.

 

You can measure grounding resistance using an ohmmeter, multimeter, or electrical safety analyzer.

Additional information

Weight 14 lbs
Dimensions 10 × 6 × 3 in

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