Total connected load current
0 A
No valid loads entered.
UL 508A §28 · NEC Article 430
Calculator 08 / UL 508A §28
Main disconnect & main breaker
Size the panel main disconnecting means and mains overcurrent protection for up to 10 three-phase motor and non-motor loads.
Panel and loads
Three-phase loads
Blank, zero, or invalid rows are ignored. Voltage (460 V) is shown for context; ampacity math uses entered current.
VoltForgeMain Disconnect & Breaker Report
Project / job name: —
Date: —
Site: voltforgelab.com
Inputs
| System voltage | 460 V |
| Loads | Load 1: — A (motor); Load 2: — A (motor); Load 3: — A (motor) |
Results
Main disconnect (switch)
30 A minimum
Calculated minimum 0 A; round up to standard switch size.
UL 508A 28.1 · NEC 430.110(C)
Main breaker (mains OCPD)
15 A maximum
Calculated maximum 0 A; a smaller standard size may be selected.
UL 508A Table 28.2 · NEC 430.62(A) · 240.6(A)
Engineering disclaimer: This design aid is not a substitute for engineering judgment. Confirm final design with a licensed professional engineer and the authority having jurisdiction.
Total connected load current
0 A
No valid loads entered.
UL 508A §28 · NEC Article 430
Main disconnect (switch)
30 A minimum
Calculated minimum 0 A; round up to standard switch size. No motor loads: sum of all valid loads.
UL 508A 28.1 · NEC 430.110(C)
Main breaker (mains OCPD)
15 A maximum
Calculated maximum 0 A; a smaller standard size may be selected by the designer. Inverse-time breaker group method.
UL 508A Table 28.2 · NEC 430.62(A) · 240.6(A)
Enter at least one valid load to calculate the main ratings.
How this was calculated
- Total connected current = sum of valid FLCs = 0 A.
- Largest motor FLC = None.
- Switch: sum of all valid loads (no motors) = 0 A.
- Mains OCPD: sum of all valid loads (no motors) = 0 A.
- Round each result up to the next standard size: switch sizes 30, 60, 100, 200, 400, 600, 800, 1200 A; breaker sizes per NEC 240.6(A).
Engineering disclaimer: This design aid is not a substitute for engineering judgment. Confirm the final disconnect, overcurrent protection, interrupting rating, motor-circuit ratings, and installation with a licensed professional engineer and the authority having jurisdiction.
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