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Searchable reference for the values electrical engineers look up dozens of times a day: wire ampacity (CEC Tables 1-4 / NEC T310.16), standard breaker sizes (NEC T240.6(A) / CEC T13), conduit fill (CEC T6 / NEC Annex C), ESA standard transformer presets (CEC Rule 26-242), and motor FLA. Source: EEP_v6_3_2.lsp wire + conduit + transformer databases.

✓ CEC 2024 (CSA C22.1:24) ✓ NEC 2023 (NFPA 70) ✓ IEC 60364-5-52 ✓ 21 AWG/kcmil sizes · 14 conduit trade sizes · 7 transformer presets

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Reference. CEC 2024 Tables 1 (Cu free air), 2 (Cu raceway), 3 (Al free air), 4 (Al raceway). Ambient base 30 °C; for other ambients apply Table 5A. For 4+ current-carrying conductors apply Table 5C bundling factor. Terminal temperature limit per Rule 4-006-2b (unmarked >100 A = 75 °C column).

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Reference. IEC 60364-5-52 ampacity. Cross-section per IEC 60228. Wires sized in mm² (≠ AWG). Use for projects outside US/Canada.

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Reference. NEC 2023 Table 240.6(A) — standard ratings for inverse-time circuit breakers and fuses. NEC 240.4(D) HARD CAPS: #14 AWG max 15 A · #12 AWG max 20 A · #10 AWG max 30 A (absolute, no exception). CEC equivalent: Table 13 + Rule 14-104.

Wire size: Count:

Reference. CEC 2024 Table 6 / NEC Annex C — maximum number of THWN/RW90 conductors per conduit trade size. Fill ratios: 53% (1 wire), 31% (2 wires), 40% (3+ wires) per NEC Chapter 9 Table 1.

ESA / CEC Rule 26-242 standard transformer presets. Primary 600 V 3φ, secondary 120/208 V 3φ 4W.

Reference. Ontario ESA Standard Transformer Preset · CEC Rule 26-242 (transformer OCP) · Rule 8-200 (sizing). Verified against ESA Bulletin 2018-26. Verify with manufacturer datasheets before final design.

AC resistance + reactance per conductor at 75 °C — used in K/CM and impedance VD methods.

VD formula (NEC Annex D / CEC Rule 8-102 / IEEE 141 Red Book): VD(V) = ph × I × L_m × (R·cos θ + X·sin θ) / (1000 × runs)
where ph = 2 for 1φ (2W/3W) or √3 = 1.732 for 3φ. Three single insulated conductors in PVC conduit (most conservative).