NEC 450.6(A)(4)(b)

[erickench]

The above NEC section read's:

The loads shall be connected to one or more individual conductors of a paralleled conductor tie without interconnecting the conductors of each phase or neutral and without the protection specified in 450.6(A)(3) at load connection points.

Question: What does without interconnecting the conductors mean?

 

[charlie b]

You have two (or more) transformers operating in parallel, supplying loads. You put them in parallel by running "tie circuits" between them. This section is talking about having the tie circuits consist of more than one conductor per phase. They give you two options having to do with whether you connect all phase A conductors to each other at the point of connection of the loads (and do the same with the other phases and the neutral). Item (b) refers to connecting a load to a single phase A conductor somewhere along the tie, without also connecting it to the other phase A conductors at the same point along the tie (and doing the same for the other phases and the neutral).