TABLE 55.2 - Minimum Cross-Sectional Area of Copper Conductors in mm²
Understanding the minimum cross-sectional area requirements for screened multi-core copper conductors used for data transfer as per Regulation 557.4.1.
OW London Electrician and Home Automation Engineers Team
TABLE 55.2 - Minimum Cross-Sectional Area of Copper Conductors in mm²
Regulation 557.4.1 - Cross-Sectional Area Requirements
Regulation 557.4.1 states:
For data transfer, the minimum cross-sectional area of a screened multi-core copper conductor shall be 0.1 mm², provided that there are no special mechanical strength requirements.
Detailed Table from Regulation 557.4.1
TABLE 55.2 - Minimum Cross-Sectional Area of Copper Conductors in mm²
| Application | Single-core | Two-core | Multicore | ||
|---|---|---|---|---|---|
| Single-wire | Stranded | Screened | Unscreened | Screened or unscreened | |
| Control circuits¹ | 0.5 mm² | 0.5 mm² | 0.5 mm² | 0.5 mm² | 0.1 mm² |
| Data transfer | - | - | - | - | 0.1 mm² |
¹ Other auxiliary circuits may need a larger cross-sectional area of copper conductor, e.g., for measuring.
This table provides a clear reference for electricians and engineers when selecting the appropriate conductor size for specific applications, ensuring compliance with BS 7671 standards.
This regulation is crucial for ensuring the reliability and safety of data transfer cables in various electrical installations. Compliance with this standard helps in maintaining the integrity of data transmission, reducing the risk of signal loss or interference.
Frequently Asked Questions
Q: What is the minimum cross-sectional area required for screened multi-core copper conductors used for data transfer?
A: The minimum cross-sectional area is 0.1 mm², as stated in Regulation 557.4.1 and Table 55.2.
Q: Does the regulation specify any special mechanical strength requirements for data transfer conductors?
A: Assuming there are no special mechanical strength requirements, the minimum cross-sectional area of a screened multi-core copper conductor for data transfer remains 0.1 mm².
Q: Why is it important to follow the regulation for the minimum cross-sectional area of data transfer cables?
A: The minimum cross-sectional area specified by Regulation 557.4.1 ensures that data transfer cables maintain the necessary electrical properties to function effectively, preventing data loss and signal interference.
Q: What are the cross-sectional area requirements for control circuits in Home Automation compared to data transfer cables?
A: In Home Automation, control circuits, the minimum cross-sectional area is typically 0.5 mm², as per Table 55.2. In contrast, data transfer cables can have a minimum of 0.1 mm², provided there are no additional mechanical strength requirements.
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