Circuit Breaker Ampere Ratings and Equivalent Stranded Wire SizesCircuit Breaker Ampere Ratings and Equivalent Stranded Wire Sizes
Ampere Rating (A) | Equivalent Stranded Wire Size (mm²) | Wire Type | Application |
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15A | 2.0 mm² | THHN/THWN | Lighting Circuits, General Purpose Outlets |
20A | 3.5 mm² | THHN/THWN | Small Appliance Circuits, Residential Outlets |
30A | 5.5 mm² | THHN/THWN | Air Conditioners, Water Heaters |
40A | 8.0 mm² | THHN/THWN | Electric Ranges, Electric Dryers |
50A | 14.0 mm² | THHN/THWN | Electric Ovens, Large HVAC Systems |
60A | 22.0 mm² | THHN/THWN | Heavy Duty HVAC Systems, Industrial Equipment |
70A | 30.0 mm² | THHN/THWN | Large Industrial Equipment |
80A | 38.0 mm² | THHN/THWN | Heavy Duty Industrial Equipment |
90A | 50.0 mm² | THHN/THWN | Large Industrial Systems |
100A | 60.0 mm² | THHN/THWN | Main Panels, Large HVAC Systems |
Circuit Breaker Ampere Ratings and Equivalent Solid Wire SizesCircuit Breaker Ampere Ratings and Equivalent Solid Wire Sizes
Ampere Rating | Max Solid Wire Size (AWG) | Typical Applications |
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15A | 14 AWG | Lighting circuits, small appliances, and general-purpose outlets |
20A | 12 AWG | Kitchen outlets, bathroom outlets, laundry areas, and garages |
30A | 10 AWG | Air conditioning units, water heaters, and dryers |
40A | 8 AWG | Electric ranges, ovens, and large air conditioning units |
50A | 6 AWG | Electric ranges, subpanels, and large appliances |
Notes:
- The wire size in mm² represents the cross-sectional area of the conductor.
- The American Wire Gauge (AWG) system is also included for reference as it is commonly used in various electrical standards.
- Applications are typical examples where each wire size might be used, but specific requirements may vary based on detailed design considerations and local regulations.
Key Considerations:
- Ampacity Derating:
- The ampacity or current-carrying capacity of conductors must be derated based on the installation conditions such as ambient temperature, number of conductors in a conduit, and other environmental factors as specified by the Philippine Electrical Code.
- Voltage Drop:
- Ensure that the selected wire size minimizes voltage drop, especially for long runs. The PEC typically recommends that voltage drop should not exceed 3% for branch circuits and 5% for feeders and branch circuits combined.
- Safety:
- Always adhere to safety standards and regulations outlined in the PEC. Proper sizing and protection of electrical conductors are crucial to prevent overheating, electrical fires, and other hazards.
Practical Tips:
- Inspection and Compliance:
- Regularly inspect wiring installations and ensure they comply with the latest PEC.
- Upgrade Considerations:
- When upgrading electrical systems, consider future load increases and select wire sizes that can accommodate potential higher current demands.
- Professional Consultation:
- Consult a licensed electrical engineer or electrician to ensure compliance with all electrical codes and standards.
For specific projects, always refer to the latest edition of the Philippine Electrical Code and consult a licensed electrical professional PEE, REE, or RME.