Nec Ampacity Table

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Nec Ampacity Table. System voltage NEC Section 240-3 requires the branch circuit feeder and service conductors to be protected against overcurrent in accordance with their ampacities as specified in Table 310-16. Table 31015B1 for tables that are based on an ambient temperature of 30 ⁰ C 86.

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10 rows Ampacity based on NEC Table 31015B16 formerly Table 31016 Allowable. For safe wiring practices consult the National Electrical Code your local building inspector or a qualified electrician. Therefore an 8 AWG conductor with a 60C allowable ampacity of 40 amperes is the minimum size permitted.

The allowable ampacity of multiconductor cables nominally rated 2000 volts or less installed according to the requirements of 39222 A shall be as given in Table 31015 B 16 and Table 31015 B 18 subject to the provisions of A 1 a b c and 31015 A 2.

Table 31016 was so well known before the 2011 code change that every code cycle since including the 2017 NEC. In addition to the ductbanks illustrated in NEC Figure 310-1 the 1987 NEC provided a method to arrive at ampacities for single row ductbanks with either two or four ducts. For Ambient Temperatures Over 30 C 86 F multiply the ampacities shown above by the appropriate factor show below. NEC 310-16 Allowable Ampacities of Insulated Conductors Temperature Rating of Conductor See Table 31013 60C 140F 75C 167F 90C 194F 60C 140F 75C 167F 90C 194F Types TBS SA SIS FEP FEPB MI RHH Types TBS SA SIS RHW-2.