What is the maximum number of 3/0 AWG XHHW aluminum conductors permitted through a 6-inch by 6-inch by 24-inch nonmetallic auxiliary gutter?

To determine the maximum number of 3/0 AWG XHHW aluminum conductors allowed in a given size of nonmetallic auxiliary gutter, it is essential to consider the National Electrical Code (NEC) guidelines, particularly those related to conductor fill capacities.

The NEC provides specific tables that outline the maximum number of conductors allowed in various raceway or enclosure types, such as auxiliary gutters. The fill capacity is based on the size of the conductors and the interior dimensions of the gutter.

In this case, the dimensions of the auxiliary gutter are 6 inches by 6 inches by 24 inches. The dimensions provide a necessary volume that affects the number of conductors that can fit safely without exceeding fill capacity limits.

For 3/0 AWG aluminum conductors, under the NEC, a designated number of these conductors can be distributed within the volume of the specified gutter while ensuring that heat dissipation and conductor integrity are maintained.

When you refer to the NEC, you'll find that for this particular configuration of the auxiliary gutter and the size of the conductors referenced, the calculated maximum number of 3/0 AWG XHHW aluminum conductors is found to be 27. This number complies with fill requirements