Neutral Feeders and Conductors under one lug

[jar546]

Let's break this down:

408.41 Grounded Conductor Terminations. Each grounded
conductor shall terminate within the panelboard in an individual
terminal that is not also used for another conductor.

Exception: Grounded conductors of circuits with parallel conductors
shall be permitted to terminate in a single terminal if the terminal is
identified for connection of more than one conductor.

This means that unless you are connecting parallel neutrals, you cannot put 2 neutrals under one lug, even if the lug is listed for 2 conductors of the size you are attaching.

 

[Mr. Inspector]

Parallel conductor installations are covered in NEC310.10(H) and are permitted for each phase, polarity, neutral, or grounded conductor in sizes 1/0 AWG and larger. Joining conductors in parallel is like having two or more smaller conductors connected at each end to make one larger conductor.

 

[jar546]

Let's break this down:

408.41 Grounded Conductor Terminations. Each grounded
conductor shall terminate within the panelboard in an individual
terminal that is not also used for another conductor.

Exception: Grounded conductors of circuits with parallel conductors
shall be permitted to terminate in a single terminal if the terminal is
identified for connection of more than one conductor.

This means that unless you are connecting parallel neutrals, you cannot put 2 neutrals under one lug, even if the lug is listed for 2 conductors of the size you are attaching.

In addition, if you need to place 2 ungrounded conductors in the same lug that is rated for 2 wires, you can regardless of whether or not they are in parallel, unlike a neutral wire.