Chassis Locking NII_Z_2: Operate Chassis Padlocking System

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, CSA Z462, NOM 029-STPS, or local equivalent. This equipment must only be installed and serviced by qualified electrical personnel. Unless specified otherwise in the maintenance procedures, all operations (inspection, test, and preventive maintenance) must be carried out with the device, the chassis, and the auxiliary circuits de-energized. Check that the device and the chassis are de-energized on the upstream and downstream terminals. Always use a properly rated voltage sensing device to confirm that the device, the chassis, and the auxiliary circuits are de-energized. Install safety barriers and display a danger sign. During the tests, it is strictly forbidden for anyone to touch the device, the chassis, or the conductors while voltage is applied. Before turning on power to this equipment, check that all connections are made with the correct tightening torque and the device is open (OFF position). Before turning on power to this equipment, put all devices, doors, and covers back in place. Before turning on power to this equipment, beware of potential hazards and carefully inspect the work area for tools and objects that may have been left inside the equipment. Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, CSA Z462, NOM 029-STPS, or local equivalent.
This equipment must only be installed and serviced by qualified electrical personnel.
Unless specified otherwise in the maintenance procedures, all operations (inspection, test, and preventive maintenance) must be carried out with the device, the chassis, and the auxiliary circuits de-energized.
Check that the device and the chassis are de-energized on the upstream and downstream terminals.
Always use a properly rated voltage sensing device to confirm that the device, the chassis, and the auxiliary circuits are de-energized.
Install safety barriers and display a danger sign.
During the tests, it is strictly forbidden for anyone to touch the device, the chassis, or the conductors while voltage is applied.
Before turning on power to this equipment, check that all connections are made with the correct tightening torque and the device is open (OFF position).
Before turning on power to this equipment, put all devices, doors, and covers back in place.
Before turning on power to this equipment, beware of potential hazards and carefully inspect the work area for tools and objects that may have been left inside the equipment.

Failure to follow these instructions will result in death or serious injury.

Procedure characteristics	Description
Action	Check the locking and unlocking of the chassis with padlocks in disconnected position or in any position, according to the chassis locking configuration.
Goal	Verify that the chassis padlocking system correctly operates.
Frequency	Refer to Recommended Frequency for the Routine End-User Maintenance Program.
Special indications	–
Necessary tools	Padlock with shackle diameter 5–8 mm Racking handle
Related documents	MasterPacT MTZ1 - IEC Switch-Disconnectors and Circuit Breakers with MicroLogic X Control Unit - User Guide MasterPacT MTZ2/MTZ3 - IEC Switch-Disconnectors and Circuit Breakers with MicroLogic X Control Unit - User Guide

The device must comply with the conditions specified below. Refer to the MasterPacT MTZ User Guides to find instructions for operating the device.

Device installation type	Position of poles	Mechanism	Device position in the chassis
Fixed	N/A	N/A	N/A
Drawout	Open	Discharged	Disconnected

The MasterPacT MTZ drawout devices offer two chassis locking possibilities with padlocks:

To determine the chassis locking possibility, move the device to the connected or test position:

If you cannot pull out the padlocking tab, the chassis can be locked in disconnected position only. Execute the locking procedure then the unlocking procedure.
If you can pull out the padlocking tab, the chassis can be locked in disconnected, test, or connected position. The locking and unlocking procedures are the same as with chassis in disconnected position. Execute these procedures in each position: connected, test, disconnected.

The following table shows the chassis locking configurations.

Chassis locking system	Device position in the chassis	Padlocking tab	Racking handle insertion with chassis locked
Chassis locking in disconnected position	Connected	Cannot be pulled out	Possible
	Test	Cannot be pulled out	Possible
	Disconnected	Can be pulled out	Not possible
Chassis locking in any position	Connected	Can be pulled out	Not possible
	Test	Can be pulled out	Not possible
	Disconnected	Can be pulled out	Not possible

Step	Action	Corrective action
1	Verify that the racking handle is not inserted in the racking handle socket.
2	Pull out the padlocking tab.	If the padlocking tab cannot be pulled out, contact your Schneider Electric Services representative.
3	Insert the padlock in this tab.
4	Check that the racking handle cannot be inserted into the racking handle socket.	If the racking handle can be inserted, contact your Schneider Electric Services representative.

Before starting this check, verify that the chassis is locked in disconnected position.

Step	Action	Corrective action
1	Remove the padlock from the tab. With MasterPacT MTZ1: push in the tab. With MasterPacT MTZ2/MTZ3: the tab retracts automatically.	If the tab does not retract fully, contact your Schneider Electric Services representative.
2	Check that the racking handle can be inserted into the racking handle socket so that racking operations can be carried out.	If the racking handle cannot be inserted, contact your Schneider Electric Services representative.

Step

Action

Corrective action

Remove the padlock from the tab.

If the tab does not retract fully, contact your Schneider Electric Services representative.

Check that the racking handle can be inserted into the racking handle socket so that racking operations can be carried out.

If the racking handle cannot be inserted, contact your Schneider Electric Services representative.