Quick Formula Guide Based on the 2020 National Electrical Code

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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.


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

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