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20-Aug-2019 13:56

However, the breakers in use today are only rated for 75*C. Since most building wire is rated for 90*C, we could use the 90*C insulation column of Table 310.16.90*C rating for insulation on building conductors, unless it is old NM, then 60*C. Of course if they are UF or THHW, or non-90*C, then those ratings would be used.The hiccup happens when the conductor goes into a breaker with 75*C rating. The current then has to be adjusted to lower the heating at the connection.So a July 20th day should be covered by derating the continuous loads 125% and derating temperature at the peak temperature of the year.

In the cases where a person's vegetarian status is disputed or they no longer adhere to a vegetarian diet, this is noted next to their entry as disputed or former. Article 310 gives the ampacities for conductors of different insulations and temperatures. I agree that the mca for an outside unit may be calculated as mca=(compressor RLA X 1.25) condenser fan motor RLA, or condenser fan motor FLA. For example, NEC 210.19 says for branch circuits not more than 600 volts that minimum conductor size before any adjustments shall have ampacity not less than the noncontinuous load, plus 125 percent of the continuous load. So yes you can have a 14 gauge wire and 15amp breaker on an MCA of 14.2amps. The RLA of a compressor in a condenser with a MCA of 14amps, is about 8 or 9 amps.I did manage to look at the right side of the correction factors table to get the degree F column.

As you picked up on 3 hours, that is the defined duration for continuous.The conductor may be sized larger to prevent excessive drop.