Electrical insulation reading margins calculator

Calculate margins by circuit and below-minimum circuit positions with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use margins by circuit and below-minimum circuit positions to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Measured insulation resistances (MΩ)
100,20,0.8
User-supplied minimums (MΩ)
1,1,1
Margins by circuit (JSON)
[99,19,-0.2]
Below-minimum circuit positions (JSON)
[3]
Smallest measured resistance (MΩ)
0.8

Try another scenario

Measured insulation resistances (MΩ)
[101, 20, 0.8]
User-supplied minimums (MΩ)
[1, 1, 1]
Margins by circuit (JSON)
[100,19,-0.2]
Below-minimum circuit positions (JSON)
[3]
Smallest measured resistance (MΩ)
0.8
Calculation method

Calculation method

Margins by circuit (JSON)

Compare circuit readings with entered minimums; ordered positions identify records needing review.

Below-minimum circuit positions (JSON)

Compare circuit readings with entered minimums; ordered positions identify records needing review.

Smallest measured resistance (MΩ)

Compare circuit readings with entered minimums; ordered positions identify records needing review.

Symbols and units
a
Measured insulation resistances (MΩ)
b
User-supplied minimums (MΩ)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Compare circuit readings with entered minimums; ordered positions identify records needing review. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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