Chart
Insulation resistance test source planning map
Map insulation resistance test planning questions to the source document, instrument range, and equipment sensitivity checks to resolve first.
Does not set a pass/fail value, approve energization, replace manufacturer instructions, or define a commissioning procedure.
planning map
Test-voltage selection bands
Use the bands to choose the next reference source; use the linked table only when a lookup row is needed.
Different equipment drives different test planning.
Nominal voltage points to the lookup table or manual.
Sensitive devices may need disconnection before testing.
Interpretation depends on test conditions and trend records.
Confirm what is connected.
Remove sensitive connected equipment where required.
Use manufacturer or table guidance.
Do not judge pass/fail from this chart.
Decision reference
Show the source-selection questions to resolve before using the insulation resistance test-voltage table or manufacturer instructions.
| Method | Best fit | Watch point | Handoff |
|---|---|---|---|
| Control circuits | Low-energy equipment review | Sensitive electronics and connected devices | Manufacturer instructions |
| Low-voltage power circuits | Feeder or equipment insulation screening | Connected loads and surge devices | Test-voltage table |
| Motors | Winding insulation trending | Temperature correction and history | Motor test procedure |
| Cables | Installed cable insulation screening | Cable type and termination condition | Cable manufacturer data |
Use notes
- Use this chart as a planning and conversation aid only.
- Confirm current utility requirements, product markings, manufacturer instructions, and local authority requirements before field work.
- Use the linked calculator or table when the task needs project-specific arithmetic.
Reference sources
Open the underlying public references before treating the chart as project guidance.