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I am looking for someone to answer my questions with respect to the nec 2020 code and respond to the discrepancy that i noted between table 310.4 and table 310.16. Ampacities for conductors rated 0 volts to 2000 volts shall be as specified in the ampacity table 310.16 through table 310.21, as modified by 310.15 (a) through (f) and 310.12. Should the wire sizes in table 310.16 be adjusted to reflect the actual listed table ampacity in the nec's current table 310.16 instead of rounded current ratings

When cable assemblies and conduit over the years were tested in contact with thermal insulation, the temperature of the conductors. 310.15 (a) is the answer to your 90 deg col question. If i have a neutral that is a current carrying conductors together with 3 ungrounded phase conductorand an equipment grounding conductor in a conduit, then i will use table 310.15 (b) (2) (a) instead of table 310.16.

The solution then shows you a reference to table 310.16 (old nec ed) where they obtain the ampacity of 380a (circuit is 480v 3ph, installed in conduit)

Does table 310.16 (old nec ed) show ampacity for 3/c cables only? An engineer gave me this chart for derating and the sizing of conductors feeding equipment in a machine room Does note d seem correct Imo it is, providing there is not more than one outlet on the circuit

Nec says the conductor ampacity to be terminated must be based on tabble 110.14 c 1 however a wire by itself without termination appears to have an ampacity equal to any table from 310.16, 310.17 etc etc but when do you often have a wire that is not terminated to use these other tables? Is this table indicating the use of 2/0 in a 150amp service is acceptable with temperatures up to 194f Your asking do the ambient temperature derate factors of table 310.16 apply to the table 310.15 (b)6 ratings I would say yes, and you would apply it to the conductor type insulation column.

According to nec table 310.16, ampacity is provided for conductors installed in raceways or buried

However, auxiliary gutters are not specifically listed in this table Despite this, auxiliary gutters function similarly to raceways since they enclose conductors, affecting the heat dissipation of the system. Table 310.16 was only known as table 310.15 (b) (16) from 2011 nec through the 2017 nec because it turned back to table 310.16 in 2020 code

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