Cable Current Ratings — NEC Table 310.16
Free download · 85 × 54mm (credit card size)
Every US electrician knows Table 310.16 — it's the most-referenced table in the National Electrical Code. This pocket card puts those ampacity values right in your wallet. The front shows conductor ampacities from Table 310.16 for common AWG/kcmil sizes (14 AWG to 500 kcmil) at 60°C, 75°C, and 90°C conductor temperature ratings. The back provides ambient temperature correction factors from Table 310.15(B)(1) and conduit fill adjustment factors for quick derating estimates. A QR code links to our NEC cable sizing calculator for detailed calculations with full code references. Built for American electricians, contractors, and engineers who need fast access to ampacity data without flipping through the codebook.
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.
Open CalculatorRelated Downloads
AS/NZS 3008 Card
Free printable pocket card with Cu/XLPE cable current ratings from AS/NZS 3008 Table 13/14 and derating factors from Table 22/25/27. Credit-card size, print and laminate.
BS 7671 Card
Free printable pocket reference card with cable current ratings from BS 7671 Table 4D2A and derating factors from Table 4B1/4C1. Print on cardstock for site use.
IEC 60364 Card
Free printable cable current rating reference card per IEC 60364 Table B.52.4/5 with derating factors from Table B.52.14/17. Pocket-sized for field use.
Conduit Fill Card
Free printable NEC conduit fill chart. Maximum conductor counts for EMT, RMC, PVC conduits with THHN/THWN wire. Per NEC Chapter 9 Table 1.
Frequently Asked Questions
What paper should I print this on?
Print on 250–300gsm cardstock. Use duplex printing and cut along crop marks. Laminate for toolbox durability.
Can I distribute this to my team?
Yes. All ECalPro reference cards are free to print and distribute within your organization.
What standard does this reference?
This card references NEC/NFPA 70:2023, specifically Table 310.16 for conductor ampacities and Table 310.15(B)(1) for ambient temperature correction factors.
How often is this updated?
Updated with each NEC code cycle. The current card reflects NEC/NFPA 70:2023, the latest edition.