A heated driveway is a permanently buried system — the testing happens before the surface goes down, or not at all. The log below is the actual testing protocol: every zone's cable ID, location, voltage, target resistance, and the three-stage test results (before, during, and after the pour).
| Cable/Mat ID | Zone Location | Operating Voltage (V) | Nominal Target Resistance (Ohms) | Test Stage 1 (Before Paving): Measured Ohms | Test Stage 1 (Before Paving): Measured MegOhms (Insulation test, target: Infinite) | Test Stage 2 (During Paving): Measured Ohms | Test Stage 2 (During Paving): Measured MegOhms | Test Stage 3 (After Paving): Measured Ohms | Test Stage 3 (After Paving): Measured MegOhms | Conductor Resistance Variance (%) | Pass/Fail Status | Source |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WHMA-240-0250 | Ramp Upper | 240V | 23.0 | 23.1 | Infinite | 23.2 | Infinite | 23.2 | Infinite | 0.0087 | PASS | 1 |
| WHMA-240-0500 | Walkway steps | 240V | 11.5 | 11.6 | Infinite | 11.7 | Infinite | 11.7 | Infinite | 0.0174 | PASS | 1 |
| WHMA-240-0250 | Ramp Upper | 240V | 23.0 | 23.2 | Infinite | 23.3 | Infinite | 23.5 | Infinite | 0.0217 | PASS | 2 |
| WHMA-240-0500 | Walkway steps | 240V | 11.5 | 11.6 | Infinite | 11.7 | Infinite | 11.8 | Infinite | 0.0261 | PASS | 2 |
| WHCA-240-0171 | Stairs/Landing (example) | 240 | 28.80 | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Not in source | 3 |
| WHCA-240-0171 | Stair treads/Landing | 240 | 28.80 | Not in source | Infinite | Not in source | Infinite | Not in source | Infinite | Not in source | Not in source | 4 |
| WHMA-120-0205 | Not in source | 120 | 28.80 | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Not in source | 3 |
| WHMA-120-0305 | Not in source | 120 | 19.20 | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Not in source | 3 |
| WHMA-240-0250 | Not in source | 240 | 11.50 | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Not in source | 3 |
| WHMA-240-0250-4 | Not in source | 240 | 14.62 | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Not in source | 3 |
| WHCA-208-0100 | Not in source | 208 | 36.05 | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Not in source | 3 |
| WHCA-277-0502 | Not in source | 277 | 12.79 | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Infinite (target) | Not in source | Not in source | 3 |
| WHMA-120-0205 | Not in source | 120 | 28.80 | Not in source | Infinite | Not in source | Infinite | Not in source | Infinite | Not in source | Not in source | 4 |
| WHMA-240-0250 | Not in source | 240 | 11.50 | Not in source | Infinite | Not in source | Infinite | Not in source | Infinite | Not in source | Not in source | 4 |
| WHMA-240-0250-4 | Not in source | 240 | 14.62 | Not in source | Infinite | Not in source | Infinite | Not in source | Infinite | Not in source | Not in source | 4 |
| WHCA-208-0377 | Not in source | 208 | 9.61 | Not in source | Infinite | Not in source | Infinite | Not in source | Infinite | Not in source | Not in source | 4 |
| WHMA-240-0250 (Inferred) | Driveway/Walkway (General) | 240V (Inferred) | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Target: Within ±15% of spec | PASS if ±15% and Infinite Insulation | 5 |
| WHMA-240-0250 | Ramp Upper | 240V | Not in source | Not in source | Infinite | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 6 |
| WHMA-240-0250 (Example) | Ramp Upper (Example) | 240V | Not in source | Not in source | Infinite | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 7 |
| WHMA-240-0250 | Ramp Upper | 240V | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 8 |
| WHMA-240-0250 | Walkway steps | 240V | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 8 |
| WHMA-240-0250 (Example) | Downtown Holland, Michigan (Sidewalks) | 240 (Inferred) | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 9 |
| WHMA-240-0250 | Driveway/Ramp | 240V | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 10 |
| Not in source | Garage ramp (Albany, NY) | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 11 |
| Not in source | Not in source | 240V | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 12 |
| Not in source | Ramp Upper (Example) | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 9 |
| Not in source | Walkway steps | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 13 |
| Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | Not in source | 14 |
The rules behind the numbers: conductor resistance must fall within -5% to +10% (some models ±15%) of the CSA label value, and insulation resistance at 500 VDC must read infinity. Any reading outside the window means the element is compromised before it is buried — the only cheap moment to fix it.
Ask any provider for their testing log before they pour. A provider who cannot produce one is gambling with your slab.
