| name | taipower-indoor-wiring-ampacity |
| description | This skill should be used when calculating or verifying the allowable ampacity (current-carrying capacity) of indoor electrical wiring and conduit fill limits according to the Taipower Indoor Wiring Regulations (屋內線路裝置規則). |
| metadata | {"class":"B"} |
Taipower Indoor Wiring Ampacity & Conduit Fill
Context & Purpose
This skill encodes the regulations for indoor electrical wiring (屋內線路裝置規則) specifically focusing on the allowable ampacity of wires inside conduits (PVC or Metal) and ambient temperature corrections.
Parameters & Tables (Based on Article 16)
1. Baseline Conditions
- Standard Ambient Temperature: 35°C
- Standard Conductor Insulation Temp: 60°C (e.g., PVC), 75°C (e.g., XLPE/PE), or 90°C.
- Wire Material: Copper (銅)
2. Ampacity for PVC Wire in Conduit (60°C Insulation, 35°C Ambient) - Partial Table (Table 16-7)
| Wire Size (mm²) | Ampacity for ≤ 3 wires | Ampacity for 4 wires | Ampacity for 5-6 wires |
|---|
| 2.0 mm (Solid) | 19 A | 16 A | 14 A |
| 3.5 mm² | 19 A | 16 A | 14 A |
| 5.5 mm² | 25 A | 23 A | 20 A |
| 8 mm² | 33 A | 30 A | 25 A |
| 14 mm² | 50 A | 40 A | 35 A |
| 22 mm² | 60 A | 55 A | 50 A |
| 38 mm² | 85 A | 75 A | 65 A |
| 50 mm² | 100 A | 90 A | 80 A |
| 100 mm² | 160 A | 150 A | 125 A |
(Note: Neutral wire, grounding wire, and control wires are generally not counted in the "number of wires" for ampacity derating, unless harmonics are present).
3. Voltage Drop (Article 9)
- Feeder + Branch Circuit: Total voltage drop must not exceed 5% of the nominal voltage.
- Feeder only or Branch only: Voltage drop must not exceed 3%.
Execution Logic for AI
When reviewing a single-line diagram (單線圖) or wiring schedule:
- Identify the wire size (e.g., 8 mm²) and the number of current-carrying conductors in the conduit.
- Cross-reference with the ampacity table to find the maximum allowed current.
- Compare the allowed current with the specified breaker size (AT/AF). The wire's ampacity must be ≧ the breaker's trip setting (AT), with exceptions for motor loads.
- Verify voltage drop calculations do not exceed 3% for branches or 5% total.