A 1200-ampere service was installed, consisting of three sets of 600 kcmil THHN/THWN copper conductors per phase. The electrical contractor was careful to cut theconductors the same length. When the utility crew made up the connections at theservice heads, they cut the conductors to different lengths to make their connectionssimpler. The actual lengths of the service-entrance conductors in a given phase ended up being20 ft (6.1 m), 22 ft (6.7 m), and 24 ft (7.3 m). The maximum ampacity of a 600-kcmilTHHN/THWN copper conductor is 420 amperes using the 75°C column of Table310.16. This is more than adequate for the calculated 1200 amperes when three conductors are run in parallel. Determine how the load of 1200 amperes would divide in each of the three paralleledconductors in a phase.
A 1200-ampere service was installed, consisting of three sets of 600 kcmil THHN/
THWN copper conductors per phase. The electrical contractor was careful to cut the
conductors the same length. When the utility crew made up the connections at the
service heads, they cut the conductors to different lengths to make their connections
simpler.
The actual lengths of the service-entrance conductors in a given phase ended up being
20 ft (6.1 m), 22 ft (6.7 m), and 24 ft (7.3 m). The maximum ampacity of a 600-kcmil
THHN/THWN copper conductor is 420 amperes using the 75°C column of Table
310.16. This is more than adequate for the calculated 1200 amperes when three conductors are run in parallel.
Determine how the load of 1200 amperes would divide in each of the three paralleled
conductors in a phase.
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