Freezer Floor Heating Cable Break → Floor Frost Heave

Question

Accepted Answer

Repeated forklift loading (3–5 t) cracks insulation, causing wire break. Check: Measure cable insulation resistance with megohmmeter — below 1 MΩ indicates cable damage in that zone. Thermal camera scan on floor: cold spot within heated zone pinpoints break What to do: Locate fault using TDR. Replace with embedded cable rated 40–60 W/m; seal all junctions with heat-shrink waterproof sleeves. Prevention: designate cable-free lanes for forklift paths or embed steel conduit Poor waterproofing at junction — moisture ingress lowers insulation resistance, causing ground fault. Check: Check GFCI breaker trip history. Visually inspect junction connectors — condensation or corrosion marks What to do: Remove faulty junction, redo with heat-shrink waterproof sleeve. All junctions must have double waterproofing Thermostat failure — heater does not activate even after floor reaches set point (−5 °C). Check: Check thermostat setting value. Verify floor sensor is not positioned directly on top of cable (can cause false readings). Apply direct power to heater (bypass thermostat) to verify heat output What to do: Replace thermostat. Relocate floor sensor to midpoint between cables. After power restore, allow approx. 24 h of heating per 10 cm of frost depth for full thaw

Freezer Floor Heating Cable Break → Floor Frost Heave

Likely causes

Repeated forklift loading (3–5 t) cracks insulation, causing wire break

Poor waterproofing at junction — moisture ingress lowers insulation resistance, causing ground fault

Thermostat failure — heater does not activate even after floor reaches set point (−5 °C)

Related cases