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November 2, 2021

Code Question of the Month – November 2021

A grounded conductor is run in four parallel conduits with 4 sets of 250 kcmil service conductors to a 1000-amp 277/480-volt, 3-ph, 4-w switchboard. The minimum size of the neutral in each conduit is ___ AWG or kcmil.

Select one:

a. 4

b. 1/0 

c. 2/0

d. 3/0

e. 250

The answer is b. 1/0 for 250 kcmil:  T.250.102(C)(1) 2 AWG      vs      1/0 minimum for parallel