Google Nest Protect Guide De L'utilisateur page 12

8. Remove the old connector
Unscrew the wire connectors to detach the 120V
connector from your old smoke alarm.
The exposed wire should be straight.
3/8 in (1 cm)
12
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9. Attach the Nest connector
Hold the white wire ends together, cap them with a
wire connector and twist clockwise until it's secure.
Do the same with the black wires. There's no need for
the red/orange/yellow wire. Simply cap it with a wire
connector and twist until secure.
Black:
Power line
Red/orange/yellow:
Interconnect
Bare
copper
White:
Neutral line