Generac Power Systems 7 kW NG Installation Manuallines page 28

8. Reconnect the power lead to a matching breaker on the load
center.
9. Make sure each circuit moved is protected by the same
size breaker in the transfer switch. 15 Amp circuits must be
connected to 15 Amp breakers and 20 Amp circuits to 20
Amp breakers.
10. When three-conductor wiring is used, two 120 volt circuits
will often share the same neutral wire. To avoid overloading the
neutral, either move BOTH of the circuits that share the neutral
or don't move either of them.
11. When moving two circuits with a shared neutral, they should
be connected to adjacent positions (one above the other) on
the load center. That will assure that the two hot wires are on
separate phases and will maintain their relationship to neutral.
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12. Remember that for every circuit moved from the main panel
to the load center, the neutral will need to be relocated to the
load center as well.
13. Connect the control wires from the generator to the terminal
block in the transfer switch. The terminals are marked N1, N2,
23, 15B, and 0.
14. Complete the transfer switch wiring by connecting the
equipment ground wire from the generator to the ground lug.
15. Close the Utility circuit breaker to restore utility power and
make sure utility voltage at the transfer switch is correct.
Refer to NFPA 70E for the safety equipment required when
working inside a live transfer switch.