Prompt Detail:
Sure, here's the table 4D3A from BS 7671:2018+A1:2022:
| Conduit or trunking reference method (in free air) | Insulation type | Rating factor 1 | Rating factor 2 | Rating factor 3 |
|---|---|---|---|---|
| Single-core cables¹ | Multi-core cables² | |||
| PVC | 0.725 | 0.715 | 0.725 | |
| EPR | 0.750 | 0.725 | 0.750 | |
| XLPE | 0.800 | 0.740 | 0.800 | |
| Rubber | 0.550 | 0.500 | 0.550 | |
| Mineral | 0.860 | 0.860 | 0.860 |
¹ Single-core cables are cables with one insulated conductor and a metallic screen or armouring.
² Multi-core cables are cables with two or more insulated conductors and no metallic screen or armouring.
Note: This table provides the recommended current-carrying capacity for copper cables in conduit or trunking for various installation conditions according to the BS 7671 standard. The rating factors are used to adjust the current-carrying capacity of the cable based on the installation conditions, such as the number of cables in the conduit or trunking, the ambient temperature, and the method of installation.
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