The user can define how terminals are to be connected to buses in three ways, not just one way: 

Generically connect a circuit element’s terminal to a bus without specifying node-to-conductor connections. This is the default connection. Normal phase sequence is assumed. Phase 1 of the terminal is connected to Node 1 of the Bus, and so on. Neutrals default to ground (Node 0). 

Explicitly specify the first phase of the device is connected to node j of the bus. The remaining phases are connected in normal 3-phase sequence (1-2-3 rotation). Neutral  conductors default to ground (Node 0). 

Explicitly specify the connection for all phases of each terminal. Using this mode, neutrals (star points) may be left floating. Any arbitrary connection maybe achieved. The syntax is: 

BUSNAME.i.j.k where i, j, k refer to the nodes of a bus. 

This is interpreted as the first conductor of the terminal is connected to node i of the bus designated by BUSNAME; the 2nd conductor is connected to node j, etc. 

The default node convention for a terminal-to-bus connection specification in which the nodes are not explicitly designated is: 

BUSNAME. … (Single-phase terminal) 

BUSNAME. … (two-phase terminal) 

BUSNAME. … (3-phase terminal) 

If the desired connection is anything else, it must be explicitly specified. Note: a bus object "learns" its definition from the terminal specifications. Extra nodes are created on the fly as needed. They are simply designations of places to connect conductors from terminals. For a 3-phase wye-connected capacitor with a neutral reactor, specify the connections as follows:

BUSNAME. {for 3-phase wye-connected capacitor} 

BUSNAME.4 {for 1-phase neutral reactor (2nd terminal defaults to node 0)}