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Quick Formula Guide Based on the 2020 National Electrical Code This 8-page Quick Formula guide contains 15 important tables based on the National Electrical Code 2020. The Quick Formula guide fits anywhere, it comes in a handy 4.3 x 5.5 zize. Includes: Table 250.66 Grounding Electrode Conductor for Alternating-Current Systems Table 250.102(C)(1) Grounded Conductor, Main Bonding Jumper, System Bonding Jumper, and Supply-Side Bonding Jumper for Alternating-Current Systems Table 250.122 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment Table 310.15(B)(1) Ambient Temperature Correction Factors Based on 30°C (86°F) Table 310.15(C)(1) Adjustment Factors for More Than Three Current-Carrying Conductors Table 310.16 Ampacities of Insulated Conductors with Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried) Table 314.16(A) Metal Boxes Table 314.16(B) Volume Allowance Required per Conductor Table 430.248 Full-Load Currents in Amperes, Single-Phase Alternating-Current Motors Table 430.250 Full-Load Current, Three-Phase Alternating-Current Motors Full Load Current Table Single Phase Transformer Formulas for Power Factor Electrical Standard Formulas