Cable Current Ratings — BS 7671
Free download · 85 × 54mm (credit card size)
Keep the key cable ratings from the IET Wiring Regulations in your pocket. This credit-card-sized reference covers Cu/XLPE 90°C current ratings from Table 4D2A for Reference Methods A1, B1, and C — the most commonly encountered installation methods in UK and international projects following BS 7671. The reverse side provides the grouping correction factors from Table 4C1 and ambient temperature corrections from Table 4B1, so you can quickly estimate whether a cable will need upsizing before running a full calculation. A QR code links to our online cable sizing calculator for detailed verification. Essential for UK-qualified electricians and engineers working to the 18th Edition Wiring Regulations.
What's Included
How to Print
- ●Recommended paper: 250–300gsm cardstock
- ●Print double-sided, flip on short edge
- ●Cut along crop marks with a paper trimmer
- ●Laminate with 80–125 micron pouches for durability
- ●Fits in wallet, toolbox, or pocket
Try the Interactive Calculator
Need precise calculations beyond quick reference? Try our free online calculator with full clause references and professional report output.
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Frequently Asked Questions
What paper should I print this on?
Print on 250–300gsm cardstock for durability. Use duplex (double-sided) printing and cut along the crop marks. Laminate with 80–125 micron pouches for long-term site use.
Can I distribute this to my team?
Yes. All ECalPro reference cards are free to download, print, and distribute within your organization. Keep the ECalPro branding and QR code intact.
What standard does this reference?
This card references BS 7671:2018+A2 (IET Wiring Regulations, 18th Edition with Amendment 2), specifically Table 4D2A for current ratings, Table 4B1 for ambient temperature correction, and Table 4C1 for grouping factors.
How often is this updated?
We update reference materials when new amendments or editions are published. This card reflects BS 7671:2018+A2, the latest edition with Amendment 2.