Masterclad 15 kV Class Medium Voltage Switchgear Outdoor Walk-in Switchgear – Instruction Bulletin PDF
6055-16, Rev. 03

Inspection and Maintenance

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, or Arc Flash
  • Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462.
  • This equipment must be installed and serviced only by qualified electrical personnel.
  • Perform such work only after reading and understanding all of the instructions contained in this bulletin.
  • Turn off all power supplying this equipment before working on or inside equipment.
  • Always use a properly rated voltage sensing device to confirm power is off.
  • Before performing visual inspections, tests, or maintenance on this equipment, disconnect all sources of electric power. Assume all circuits are live until they are completely de-energized, tested, and tagged. Pay particular attention to the design of the power system. Consider all sources of power, including the possibility of backfeeding.
  • Always practice lock-out/tag-out procedures according to OSHA requirements.
  • Open all circuit breaker and switch contacts and discharge all springs before performing maintenance work, disconnection, or removal of a circuit breaker.
  • Move circuit breakers to the disconnected position before removing rear access panels.
  • Conduct electrical testing to confirm no short circuits were created during installation, maintenance, or inspection.
  • Never insert a circuit breaker into a circuit breaker compartment that is not complete and functional.
  • Disconnect all high voltage to the switchgear before accessing the horizontal bus compartment.
  • Do not use liquid fire extinguishers or water on electrical fires. Before extinguishing fires within the assembly, ensure all sources of electric power are disconnected and the main and all feeder circuit breakers are open.
  • Carefully inspect your work area, and remove any tools and objects left inside the equipment.
  • Replace all devices, doors, and covers before turning on power to this equipment.
  • All instructions in this manual are written with the assumption that the customer has taken these measures before performing maintenance or testing.
Failure to follow these instructions will result in death or serious injury.
NOTE: The complete assembly arrangement determines if the top or bottom contacts are the line side; both can be energized when the circuit breaker is removed from the compartment.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, or Arc Flash
  • Ground the main and feeder circuits before touching the main bus, bus pads, or primary contacts.
  • Make sure there are no obstructions within 48 inch (1219 mm) of the rear door for proper vent function.
  • Inspect air filters during maintenance and replace if necessary.
  • Do not remove the air filters except for inspection/replacement.
  • Do not use filters other than ones recommended in this instruction manual.
Failure to follow these instructions will result in death or serious injury.

Set environmental controls (thermostat, humidistat, other items.) to mitigate condensation (including times when the equipment is lightly loaded, such as storage, downstream loads deenergized). Consult the engineer of record for the appropriate environmental control settings.

Perform inspection and maintenance of the walk-in enclosure based on environmental conditions and experience. Abnormal operation or conditions may require immediate corrective action.

The inspection of the Masterclad Metal-Clad 4.76–15 kV Indoor Switchgear is outlined in detail in Instruction Bulletin 6055–30.

The following instructions apply only to the walk-in enclosure.

Routine Inspection

During regular inspection intervals, inspect for the following:

  • Check for leaks in the front aisle, in each cable compartment, and in the roof of the indoor switchgear. Check the roof, using a flashlight, through the vent openings from the front aisle. If large puddles of water are found at the doors, check the door gaskets.

  • Check the seeping holes in the cable compartment doors to make sure they are not clogged.

  • Check the heater and fan in the front aisle for proper operation. Check the thermostat settings (see Electrical Low Voltage Connections). Verify that the space heaters in the switchgear are operating.

  • Check that the door panic latch (for use in an emergency) is working properly.

Replacing the Air Filters

Rear Doors, Front (left) and Back (right)

Replace air filters every six months or as environmental conditions dictate. The following table lists correct filter applications.

Air Filter Part Numbers

Filter Location*

Bay Width in. (mm)

Schneider Electric Part Number

Size
in. (mm)

New Rear Door Top Louvers (see Rear Doors, Front (left) and Back (right))

36 (914)

JYT25926

29.75 x 7.6
(756 x 193)

New Rear Door Bottom Louvers (see Rear Doors, Front (left) and Back (right))

36 (914)

JYT16426

29.75 x 14.42
(756 x 366)

Rear Door

22 (559)

46005-679-01

11 x 13
(279 x 330)

36 (914)
48 (1219)

46005-243-01

11 x 19.5
(279 x 495)

Rear Eaves

22 (559)

44005-679-02

3.3 x 20
(84 x 508)

36 (914)

46005-243-03

3.3 x 34
(84 x 864)

48 (1219)

46005-418-02

3.3 x 46
(84 x 1168)

Bottom Rear Door Filters

Walk-in Units with Rear Doors Open

Instructions for changing the filter in the bottom of the rear door (item A in the figure above):

  1. Open the rear doors.

  2. Remove the four filter support nuts and the support (JYT22125) as shown in Removing the Used Filter (Bottom Louver). (Note: it is not necessary to remove the eight self-threaded screws in the support frame.)

  3. Remove the used filter and discard it.

  4. Replace the used filter with a new Schneider Electric filter (JYT16426).

  5. Reinstall the filter support (JYT122125) along with the new filter.

  6. Reinstall all the nuts and washers as shown in Replacing the New Filter (Bottom Louver).

Removing the Used Filter (Bottom Louver)

Replacing the New Filter (Bottom Louver)

Top Rear Door Filters

Walk-in Units with Rear Doors Open

Instructions for changing the filter in the top of the rear door (item B in Walk-in Units with Rear Doors Open):

  1. Open the rear doors.

  2. Remove the four filter support nuts and the support (JYT25917) as shown in Removing the Used Filter (Top Louver).

    NOTE: It is not necessary to remove the eight self-threaded screws in the support frame.

  3. Remove the used filter and discard it.

  4. Replace the used filter with a new Schneider Electric filter (JYT25926).

  5. Reinstall the filter support (JYT25917) along with the new filter.

  6. Reinstall all the nuts and washers as shown inReplacing the New Filter (Top Louver).

Removing the Used Filter (Top Louver)

Replacing the New Filter (Top Louver)

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