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Correction:

Oct. 1, 2004
The answer to the second question in Code Quandaries on page 60 of the August 2004 issue incorrectly applied an ampacity taken from the 75C column (65A) of Table 310.16 for the 6 AWG THHN conductor in question. It should have been taken from the 90C column (75A), which would have changed the rating as follows: (75A0.80=60A)

The answer to the second question in Code Quandaries on page 60 of the August 2004 issue incorrectly applied an ampacity taken from the 75°C column (65A) of Table 310.16 for the 6 AWG THHN conductor in question. It should have been taken from the 90°C column (75A), which would have changed the rating as follows:

(75A×0.80=60A)

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