ETAP
defines a bus as a switchgear, switchrack, motor control center,
or a point between any two branch-type devices. Panels and sub-panels
are not considered buses. ETAP calculates the number of buses
per project file.
There is no limit to the number of buses you
can draw in each ETAP project.
Limitations are imposed when you
run calculations. ETAP verifies that the number of energized
buses during the calculation is less or equal to the license
limit.
Equipment cables and sub-panels are considered part of the load; therefore there
is no need to use a bus or node for the load terminal connection. It would take thousands (1,000s) of buses in other software to model the same system in ETAP with one hundred (100) buses.
In the example
below, three (3) buses are required to model the system, versus seven (7) buses
normally (one extra bus for every load terminal). |