Resistivity Testing
In-Situ Resistivity and Conductivity
We operate a Syscal Junior, an all-purpose resistivity and induced polarisation system ideal for Wenner sounding arrays and various near-surface geophysical applications. This equipment is suitable for soil and bedrock mapping, water and pollution monitoring, and detecting underground structures.
Wenner 4-pole resistivity testing measures subsurface electrical resistivity using four electrodes placed in a line with equal spacing. The outer electrodes inject current while the inner electrodes measure the voltage drop, allowing for vertical electrical sounding at different depths. This method effectively maps subsurface resistivity changes, indicating geological formations, groundwater levels, or contaminants.
Wenner 4-pole testing provides valuable data for geological surveys, environmental assessments, and engineering projects, particularly in cabling and electrical infrastructure where earthing and cathodic protection are important.
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Thermal Resistivity
Thermal resistivity testing evaluates soil's thermal properties, crucial for designing efficient underground electrical infrastructure. It measures how well soil conducts heat, directly impacting the performance and lifespan of buried power cables and electrical equipment. Tests can be conducted in the field on soil and backfill materials, with samples taken for laboratory analysis under varying moisture conditions.
In electrical projects, thermal resistivity testing assists in:
- Cable Design: Determining optimal cable type and size based on soil thermal properties to prevent overheating and ensure reliable power transmission
- Heat Dissipation: Evaluating soil's ability to dissipate heat from electrical currents, maintaining safe operating temperatures for cables and equipment
- Grounding Systems: Optimizing grounding system designs to safely disperse electrical fault currents into the soil without causing thermal damage
Accurate thermal resistivity measurements empower engineers to enhance the efficiency, reliability, and safety of electrical infrastructure installations.
- Testing to ASTM D5334-14 and IEEE Std 442
- Field testing on soil and backfill at natural moisture content
- Laboratory 6-point dry-out curve
- Laboratory testing at specified moisture content
