(often called "soil drying out" or "thermal runaway"), which can cause the soil surrounding a buried cable to crack and lose its ability to dissipate heat. A highly relevant blog post for this topic is
Sound and Performance
3. Conductor Sizing Verification By inputting the specific fault current magnitude and duration (based on relay settings), CymCap verifies if the selected conductor size adheres to IEEE Std 80. cymcap hot crack
If you are referring to a failure mode of the cable insulation, you are likely looking for Thermal Cracking. (often called "soil drying out" or "thermal runaway"),
The Cymcap hot crack is not an act of God; it is a predictable failure mode rooted in metallurgy and technique. It thrives where restraint is high, bead shape is concave, and filler metal chemistry is mismatched. The good news is that with disciplined control of travel speed, crater filling, and convex bead profiles, the defect can be virtually eliminated. Option 2: "Thermal Cracking" (Insulation Failure) If you
Figure 1 (conceptual) shows intergranular, oxidized crack surfaces typical of hot cracking. Cracks are exclusively located in the heat-affected zone (HAZ) of the Cymcap, 50–150 μm from the solder interface. Branched morphology with smooth, dendritic features indicates liquid film presence during cracking.
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