Mechanical Interlocking NII_Z_1: Operate Interlocking Systems

Safety Instructions

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 Definition

Procedure characteristics	Description
Action	Check the locking and unlocking of the interlocked devices.
Goal	Verify the operation of the interlocking system between interlocked devices.
Frequency	Refer to Recommended Frequency for the Routine End-User Maintenance Program.
Special indications	–
Necessary tools	–
Related documents	MasterPacT MTZ1 - VBP Lockable Pushbutton Cover - Instruction Sheet MasterPacT MTZ1 - Mechanical Interlocking for Source Changeover (2 Sources / Cable) - Instruction Sheet MasterPacT MTZ1 - Mechanical Interlocking for Source Changeover (2 Sources / Rods) - Instruction Sheet MasterPacT MTZ2/MTZ3 - VBP Lockable Pushbutton Cover - Instruction Sheet MasterPacT MTZ2/MTZ3 - Mechanical Interlocking for Source Changeover (2 Sources / Cable) - Instruction Sheet MasterPacT MTZ2/MTZ3 - Mechanical Interlocking for Source Changeover (2 Sources / Rods) - Instruction Sheet MasterPacT MTZ2/MTZ3 - Mechanical Interlocking for 3 Sources - Instruction Sheet MasterPacT MTZ2/MTZ3 - Mechanical Interlocking for 2 Sources and 1 Replacement - Instruction Sheet MasterPacT MTZ2/MTZ3 - Mechanical Interlocking for 2 Sources and 1 Coupling - Instruction Sheet

Preliminary Conditions

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

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

Checking the Locking and Unlocking of Interlocked Devices

Follow the procedure to check the locking and unlocking of the following interlocking systems:

Cable interlocking system:
- Two sources
- Three sources
- Two sources and one replacement
- Two sources and one coupling
- Cable-type door interlock
Rod interlocking system
Electrical interlocking system
- IVE electrical interlocking system
- Custom electrical interlocking system

Step	Action	Corrective action
1	Perform at least one manual operating sequence without power to check that the interlocking system operates correctly in all situations. Refer to the relevant instruction sheet for the interlocking system installed on the device.	If an interlocking system is not operating correctly, contact your Schneider Electric Services representative.
2	Lock the closing pushbuttons of all interlocked devices with padlocks sharing the same key.	The VBP pushbutton locking accessory is mandatory to provide redundancy in addition to the mechanical interlocking system. Install a VBP pushbutton locking accessory on each interlocked device, if not already installed. Refer to the relevant instruction sheet for accessory installation.

Step

Action

Corrective action

Perform at least one manual operating sequence without power to check that the interlocking system operates correctly in all situations. Refer to the relevant instruction sheet for the interlocking system installed on the device.

If an interlocking system is not operating correctly, contact your Schneider Electric Services representative.

Lock the closing pushbuttons of all interlocked devices with padlocks sharing the same key.

The VBP pushbutton locking accessory is mandatory to provide redundancy in addition to the mechanical interlocking system.

Install a VBP pushbutton locking accessory on each interlocked device, if not already installed. Refer to the relevant instruction sheet for accessory installation.