⚡ AC Motor Calculations
Professional Motor Analysis & Design Tool
| Motor ID | HP | Voltage (V) | Phase | Service Factor | Length (ft) | Ambient (°C) | Max VD (%) | Disconnect Mult. | Fuse Mult. | Breaker Mult. | FLC (A) | Conductor Size | Ground Size | Voltage Drop | Breaker (A) | Fuse (A) | Disconnect (A) | NEMA Size | Overload (A) | Conduit Size | Actions |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| - | - | - | - | - | - | - | - | - | - | ||||||||||||
| - | - | - | - | - | - | - | - | - | - | ||||||||||||
| - | - | - | - | - | - | - | - | - | - |
📊 Ampacity Derating Factors (NEC 310.15(B)(3)(a))
| Number of Current-Carrying Conductors | Percent of Values in Tables | Common Applications |
|---|---|---|
| 1-3 | 100% | Single motor, individual circuits |
| 4-6 | 80% | Two 3-phase motors in same conduit |
| 7-9 | 70% | Three 3-phase motors in same conduit |
| 10-20 | 50% | Multiple motors, control circuits |
| 21-30 | 45% | Large motor control centers |
| 31-40 | 40% | Industrial distribution panels |
| 41 and above | 35% | High-density installations |
Motor Full Load Current (NEC Table 430.250)
| Enable | HP | 208V (A) | 240V (A) | 480V (A) | 600V (A) | Actions |
|---|---|---|---|---|---|---|
Motor Branch-Circuit Protection (NEC Table 430.52)
| Enable | Type of Motor | Non-Time Delay Fuse (%) | Dual Element Fuse (%) | Instantaneous Trip Breaker (%) | Inverse Time Breaker (%) | Motor FLA Rating | Actions |
|---|---|---|---|---|---|---|---|
Conductor Ampacity (NEC Table 310.15(B)(16))
| Enable | AWG Size | THWN-2 (A) | XHHW-2 (A) | Resistance (Ω/1000ft) | Actions |
|---|---|---|---|---|---|
Equipment Grounding Conductor (NEC Table 250.122)
| Enable | Overcurrent Device (A) | Copper EGC (AWG) | Aluminum EGC (AWG) | Actions |
|---|---|---|---|---|
NEMA Starter Sizes
| Enable | NEMA Size | Max HP @ 208V | Max HP @ 480V | Max Current (A) | Actions |
|---|---|---|---|---|---|
Standard Ampere Ratings (NEC Table 240.6(A))
| Enable | Standard Rating (A) | Device Type | Common Applications | Actions |
|---|---|---|---|---|
Conduit Fill (NEC Chapter 9, Table 4 & Annex C)
| Enable | Conduit Size | 40% Fill (in²) | Max #12 THWN | Max #10 THWN | Max #8 THWN | Actions |
|---|---|---|---|---|---|---|