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Specialty Materials Testing

Underground Cable Route Thermal Surveys

Cable route thermal surveys measure selected soil conditions along an alignment so the design team can replace one broad assumed value with location-based data tied to route segments and installation depth.

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Service overview

What this service involves

The survey starts with route segmentation. Calicore reviews alignment drawings, anticipated burial depth, geotechnical logs, geology, drainage, crossings, cut-and-fill limits, and proposed backfill. Those records are used to identify test stations that distinguish meaningful material or moisture settings rather than applying an arbitrary equal spacing to every project.

At each accessible station, the field team records location, depth, exposed material, surface condition, recent weather or wetting, temperature, and anything that may affect the measurement. The thermal probe is installed in suitable in-place material, readings are repeated as required by the agreed procedure, and representative soil can be sealed for laboratory moisture, density, classification, or dry-out testing.

The final route table connects each measurement to its station and the segment it may represent. The project’s cable designer then decides how the field points, laboratory curves, installation geometry, and design moisture assumptions enter the ampacity or thermal model.

Step by step

How the process works

The exact scope is matched to the project, but a typical assignment follows these steps.

  1. 01

    Segment the alignment

    Plans, profiles, geotechnical logs, geology, drainage, cut and fill, cable depth, crossings, and proposed backfill are reviewed to identify meaningful route units.

  2. 02

    Build the station schedule

    Test points target representative and potentially controlling materials instead of using one unexplained spacing for every alignment.

  3. 03

    Complete the field survey

    At each accessible station, the team documents material, depth, condition, location, access, and thermal-probe measurements; selected samples are sealed for laboratory work when included.

  4. 04

    Deliver a route-based dataset

    The table and map connect each field point and laboratory sample to the route segment it can inform, leaving final model-value selection with the responsible cable designer.

Review criteria

What makes a route survey usable

The survey must preserve the connection between subsurface variability, measured points, modeled material zones, and the route decisions the data are meant to support.

What you receive

Typical project deliverables

  • Route segmentation and station schedule
  • GPS- or station-referenced field measurements
  • Material, depth, moisture, and site-condition records
  • Route summary with laboratory-sample cross references

Common project needs

When this service is useful

  • Transmission and distribution cable corridors
  • Renewable collector systems and gen-ties
  • Substation approaches and critical crossings
  • Long routes crossing variable soils

Frequently asked

Underground Cable Route Thermal Surveys questions

How far apart are thermal survey points?+

There is no universal spacing. Locations are selected from route length, material changes, depth, crossings, existing subsurface data, thermal consequence, and the design team’s required coverage.

Do you test directly at cable depth?+

The measurement should represent the modeled material zone. Access method and depth are coordinated with the project team, excavation plan, utility clearance, and site safety requirements.

Can route samples also receive dry-out curves?+

Yes. Field and laboratory work can be combined so selected route materials are measured in place and then characterized across controlled moisture conditions.

Technical guides

Learn more about underground cable route thermal surveys.

Use these technical articles to understand the methods, limitations, evidence, and decisions behind the service.

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What to send us to begin

Send a short description of the work, any plans, specifications, or photographs you have, and tell us what you need the service to provide. Include a project location if it applies.

Request a proposal