3/11/2024 0 Comments Wire ampacity chart![]() Types RHW, THHW, THW, THWN, XHHW, XHWN, USE NEC Table 310.16 Aluminum or Copper-Clad Aluminum Size AWG or kcmil Types TBS, SA, SIS, FEP, FEPB, MI, PFA, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, USE-2, XHH, XHHW, XHHW-2, XHWN, XHWN-2, XHHN, Z, ZW-2 Types RHW, THHW, THW, THWN, XHHW, XHWN, USE, ZW NEC Table 310.16 Copper Size AWG or kcmil Pay close attention to the table notes, they are critical to proper application of Table 310.16. Tabulated AC voltage drop calculations for quick reference can be found here: Alternating Current Voltage Drop Calculation Table, or calculate the exact voltage drop here: AC Voltage Drop Calculator. Adjustments for temperatures above or below 30☌ can be found in NEC Table 310.15(B)(1). Table 310.16 is applicable up to 2,000 volts with an ambient temperature of 30☌ (86☌). Note: a neutral is a current-carrying conductor while the grounding conductor(s) are not. The reason is the inherent practicality and breadth of installations covered by “…Insulated Conductors with Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried)”. Table 310.16 is one of the most commonly used tables in the National Electrical Code.
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