Electrician's Cheat Sheet
AWG Current Capacity
| AWG |
Max Amps |
AWG |
Max Amps |
| 30 | 2 | 10 | 30 |
| 28 | 3 | 8 | 40 |
| 26 | 4 | 6 | 55 |
| 24 | 5 | 4 | 70 |
| 22 | 7 | 2 | 95 |
| 20 | 8 | 1 | 110 |
| 18 | 10 | 1/0 | 125 |
| 16 | 13 | 2/0 | 145 |
| 14 | 15 | 3/0 | 165 |
| 12 | 20 | 4/0 | 195 |
Note: Values are approximate. Consult NEC for specific applications.
Quick Reference for Controls Technicians
- Standard Control Voltage: 24V DC
- Common PLC Voltages: 120V AC, 24V DC
- PLC I/O Types:
- DI: Digital Input (24V DC, Dry Contact)
- DO: Digital Output (Relay, Transistor)
- AI: Analog Input (4-20mA, 0-10V)
- AO: Analog Output (4-20mA, 0-10V)
- VFD Basics:
- Allen Bradley quick reference guide
- Input: 120V/240V/480V AC (1Φ or 3Φ)
- Output: 0-Input Voltage, Variable Freq (0-60Hz Typ)
- Control: 4-20mA, 0-10V, Modbus
- Common Faults: Overcurrent, Overvoltage, Overtemp
- Low Voltage Wiring:
- Typical Gauges: 18-22 AWG (Shielded for Analog)
- Max Distance: 1000ft (24V DC), 4000ft (4-20mA)
- Shielding: Ground at One End Only
- Sensor Types:
- RTD: 100Ω at 0°C (PT100), 2/3/4-Wire
- Thermocouple:
- J: 0-760°C (32-1400°F)
- K: -200-1350°C (-328-2462°F)
- T: -200-350°C (-328-662°F)
- Proximity: NPN/PNP, 10-30V DC, 200mA Max
- Pressure: 4-20mA, 0-10V, 24V DC Supply
- Flow: Pulse Output, 4-20mA, Mag/Turbine
- Common Signal Standards:
- Analog: 4-20mA (Loop-Powered), 0-10V
- Digital: 24V DC (Sink/Source), Pulse (Hz)
- Comm: RS-485 (Modbus), Ethernet/IP
- Troubleshooting Tips:
- No Signal: Check Polarity, Loop Power
- Noise: Verify Shielding, Ground Loops
- VFD Trips: Check Load, Ramp Time
- IP Ratings:
- IP65: Dust-tight, Water Jets
- IP66: Dust-tight, Powerful Water Jets
- IP67: Dust-tight, Immersion