Breaking Unit NIII_Z_2: Check Mounting of Arc Chutes and Filter Cleanliness

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.

DANGER
HAZARD OF DEVICE FALLING Be sure that lifting equipment has lifting capacity for the device being lifted. Follow manufacturer’s instructions for use of lifting equipment. Wear hard hat, safety shoes, and heavy gloves. Failure to follow these instructions will result in death or serious injury.

Procedure characteristics	Description
Action	Check that the arc chutes are properly tightened. Check that the filters are clean.
Goal	Verify the breaking performance of the device during a short-circuit.
Frequency	Refer to Recommended Frequency for the Intermediate End-User Maintenance Program.
Special indications	This procedure is not applicable to the MasterPacT MTZ1 H3 devices because arc chutes are not removable on MasterPacT MTZ1 H3 devices.
Necessary tools	Torque wrench Vacuum cleaner
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 MasterPacT MTZ1 - Arc Chute - Instruction Sheet MasterPacT MTZ2/MTZ3 - Arc Chute - Instruction Sheet

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	Open	Discharged	N/A
Drawout	Open	Discharged	Disconnected and Removed from chassis

Step	Action	Corrective action
1	Check the presence of all screws on the arc chutes (except for MasterPacT MTZ1 H3). NOTE: The presence of all screws is mandatory to help to prevent the ionized gas from leaking through the edges of the arc chute.	If screws are damaged or missing, contact your Schneider Electric Services representative.
2	Unscrew the screws on the arc chutes (except for MasterPacT MTZ1 H3), then tighten them to the recommended value using a torque wrench: For MasterPacT MTZ1: 1.5 N•m For MasterPacT MTZ2/MTZ3: 7 N•m	If a screw cannot be tightened at the recommended value, contact your Schneider Electric Services representative.
3	Use a vacuum cleaner to remove the dust deposited on the filters. NOTE: To avoid soiling the filters: Do not blow air on the filter. Do not use a cloth, particularly if there is dust and grease.	If the filters are still dirty (for example, greasy compound), replace the arc chutes (refer to MasterPacT MTZ - Arc Chute - Instruction Sheet). Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.

Step

Action

Corrective action

Check the presence of all screws on the arc chutes (except for MasterPacT MTZ1 H3).

NOTE: The presence of all screws is mandatory to help to prevent the ionized gas from leaking through the edges of the arc chute.

If screws are damaged or missing, contact your Schneider Electric Services representative.

Unscrew the screws on the arc chutes (except for MasterPacT MTZ1 H3), then tighten them to the recommended value using a torque wrench:

If a screw cannot be tightened at the recommended value, contact your Schneider Electric Services representative.

Use a vacuum cleaner to remove the dust deposited on the filters.

NOTE: To avoid soiling the filters:

If the filters are still dirty (for example, greasy compound), replace the arc chutes (refer to MasterPacT MTZ - Arc Chute - Instruction Sheet).

Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.