Liebert STS2 - Manual (Page 89)

Operating Instructions
81
10.5.2 Shutdown in Maintenance Bypass Mode
When the Static Transfer Switch 2 Power Distribution Unit is operating on bypass:
1. Turn off the load equipment per manufacturer’s recommendations.
2. Open CB8 or panelboard breakers and main if supplied
3. Open the bypass switch (CB4 or CB5) to turn off the static transfer switch output.
4. To completely de-energize the unit, turn open CB6 and CB7.