Electrical panel spare-way planning calculator

Calculate ways after additions and unallocated ways with your own figures.

Your numbers

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

Use ways after additions and unallocated ways to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Panel available ways (count)
36
Existing circuit module widths (ways)
2,2,4
Planned circuit widths (ways)
2,4,2
Reserved spare ways (count)
6
Ways after additions (count)
16
Unallocated ways (count)
20
Margin after reserve (count)
14

Try another scenario

Panel available ways (count)
37
Existing circuit module widths (ways)
[2, 2, 4]
Planned circuit widths (ways)
[2, 4, 2]
Reserved spare ways (count)
6
Ways after additions (count)
16
Unallocated ways (count)
21
Margin after reserve (count)
15
Calculation method

Calculation method

Ways after additions (count)

Sum existing and planned modular widths; subtract from panel ways, then deduct reserve.

Unallocated ways (count)

Sum existing and planned modular widths; subtract from panel ways, then deduct reserve.

Margin after reserve (count)

Sum existing and planned modular widths; subtract from panel ways, then deduct reserve.

Symbols and units
a
Panel available ways (count)
b
Existing circuit module widths (ways)
c
Planned circuit widths (ways)
d
Reserved spare ways (count)

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; Sum existing and planned modular widths; subtract from panel ways, then deduct reserve. 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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