kVA Tools
BETA
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Motor Dashboard
The Motor Dashboard computes the full NEC Article 430 protection chain for individual AC induction motors: conductor sizing, branch circuit protection, overload protection, disconnect sizing, and locked rotor verification.
Project Title
Input — Motor Nameplate
Motor
Rated Power
HP
kW
W
Voltage (V)
Select...
115 V
200 V
208 V
230 V
460 V
575 V
Phase Configuration
Select...
Single-Phase (1Ø)
Three-Phase (3Ø)
Service factor
1.15 (standard)
1.0
Motor design
Design B (standard)
Design A
Design C
Design D
Design BE (NEC 2026 — high efficiency)
Design CE (NEC 2026 — high efficiency)
Code letter (locked rotor)
Unknown
A (0–3.14 kVA/HP)
B (3.15–3.54)
C (3.55–3.99)
D (4.0–4.49)
E (4.5–4.99)
F (5.0–5.59)
G (5.6–6.29)
H (6.3–7.09)
J (7.1–7.99)
K (8.0–8.99)
L (9.0–9.99)
M (10.0–11.19)
N (11.2–12.49)
P (12.5–13.99)
R (14.0–15.99)
S (16.0–17.99)
T (18.0–19.99)
U (20.0–22.39)
V (22.4 and up)
FLA (A)
NEC Lookup
Protection
Branch circuit protection type
Select...
Time-delay fuse (dual element)
Non-time-delay fuse
Inverse-time circuit breaker
Instantaneous-trip breaker (MCP)
Starting method
Direct on-line (DOL)
Reduced voltage / soft start
Variable frequency drive (VFD)
Output — Advisories
Enter motor data to generate advisories.
Output — NEC 430 Protection Chain
Parameter
Value
NEC reference
Motor current data
Table FLA (NEC)
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Table 430.248 / 430.250
Design FLA (used for sizing)
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§430.6(A)
Locked rotor current (LRA)
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Table 430.251(A)/(B) / 430.251(C)
Branch circuit conductor — §430.22 / §430.22(H)
Min. conductor ampacity
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§430.22 / §430.22(H)
Branch circuit SC & GF protection — §430.52
Max. protection device size
—
Table 430.52
Next standard size (if applicable)
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§430.52(C)(1) Ex. 1
Protection type selected
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—
Overload protection — §430.32
Max. overload device trip current
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§430.32(A)(1)
Overload relay (if separate)
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—
Disconnect — §430.110
Min. disconnect ampere rating
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115% × FLA
Locked rotor verification
LRA / instantaneous trip check
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