Installation

Follow steps 1–4 to rack the VT drawout unit from the CONNECTED position to the DISCONNECTED position.

1. With the VT compartment door closed, insert the Schneider Electric racking handle into the racking port and engage the handle onto the racking shaft.

   Racking Handle Engaged onto Racking Shaft

   

   WARNING
   racking mechanism damage Never force the primary fuse drawout unit into or out of the primary fuse drawout unit compartment. If the racking mechanism is not operating easily, inspect the equipment and remove any foreign objects or debris or contact Schneider Electric. Failure to follow these instructions can result in death, serious injury, or equipment damage.

2. Rotate the racking handle counterclockwise.

   NOTE: If the VT drawout unit does not easily rack out of the CONNECTED position, contact Schneider Electric.

3. Verify that the grounding contact chains, extending from the ground bar at the top on the VT drawout compartment, touch the fuse ground tabs on the VT drawout unit as it moves from the CONNECTED position to the DISCONNECTED position.

4. Continue rotating the racking handle counterclockwise until VT drawout unit is fully racked to the DISCONNECTED position.

Visually inspect fuses for possible damage. Replace the fuses if necessary. See Replacing the Fuses.

After inspecting the VT drawout unit follow the steps below to rack it to the CONNECTED position:

1. Close the VT drawout unit compartment door.

2. Insert the Schneider Electric racking handle into the racking port and engage the handle onto the racking shaft.

3. Rotate the racking handle clockwise until VT drawout unit is fully racked to the CONNECTED position.

The CPT primary fuse drawout unit is interlocked with a molded case CPT secondary main circuit breaker by a key interlock system. The key interlock scheme uses two locks and one key.

Follow steps 1–7 to rack the fuse drawout unit from the CONNECTED position to the DISCONNECTED position.

1. Place the molded case CPT secondary main circuit breaker in the OPEN (O) position. The circuit breaker is mounted on the compartment frame below the drawout unit

2. Turn the key to extend the CPT secondary main circuit breaker key interlock bolt to lock it in the OPEN (O) position.

3. Remove the key.

4. Insert the key into the racking mechanism key interlock of the primary fuse drawout unit.

5. Withdraw the key interlock bolt on the racking mechanism.

   Key Interlocks for Drawout Primary Fuses and Secondary Circuit Breaker

   

6. With the CPT compartment door closed, insert the Schneider Electric racking handle into the racking port and engage the handle onto the racking shaft (see Racking Handle Engaged onto Racking Shaft).

   WARNING
   racking mechanism damage Never force the primary fuse drawout unit into or out of the primary fuse drawout unit compartment. If the racking mechanism is not operating easily, inspect the equipment and remove any foreign objects or debris or contact Schneider Electric. Failure to follow these instructions can result in death, serious injury, or equipment damage.

7. Rotate the racking handle counterclockwise until primary fuse drawout unit is fully racked to the DISCONNECTED position.

Visually inspect fuses for possible damage. Replace the fuses if necessary. See Replacing the Fuses.

After inspecting the primary fuse drawout unit, follow the steps below to rack it to the CONNECTED position:

1. Close the primary fuse drawout unit compartment door.

2. Insert the Schneider Electric racking handle into the racking port and engage the handle onto the racking shaft.

3. Rotate the racking handle clockwise until primary fuse drawout unit is fully racked to the CONNECTED position.

If the CPT primary fuse drawout unit does not easily rack into the CONNECTED position, rack the unit to the DISCONNECT position, remove any objects or debris from the compartment. Repeat steps 2 and 3. If results are not satisfactory, contact Schneider Electric.

Seismic certification is an optional feature on the Masterclad 27 kV Metal-Clad product line and provides seismic conformance options to any of the North American and International building codes and seismic design standards identified in List of Supported Regional Building Codes and Seismic Design Standards. Masterclad 27 kV Metal-Clad that is seismically certified has been certified to the seismic requirements of the listed code per the manufacturer’s certificate of compliance (CoC). Equipment compliance labels and CoC’s are provided with all seismically certified Masterclad 27 kV Metal-Clad. Refer to the equipment CoC for certification details and applicable seismic parameters. To maintain the validity of this certification, the installation instructions provided in this section must be followed.

The Masterclad 27 kV Metal-Clad equipment is considered a nonstructural building component as defined by regional building codes and seismic design standards. Equipment capacity was determined from tri-axial seismic shake-table test results in accordance with the International Code Counsel Evaluation Service (ICC ES) Acceptance Criteria for Seismic Certification by Shake-Table Testing of Nonstructural Components (ICC-ES AC156).

An equipment importance factor, I_p, that is greater than one (I_p > 1.0) is assumed and indicates that equipment functionality is required after a seismic event and after seismic simulation testing. This importance factor is applicable for designated seismic systems (for example, special certification) servicing critical infrastructure and essential buildings where post-earthquake equipment functionality is a requirement.

Incoming and outgoing bus, cable, and conduit must also be considered as related but independent systems. These distribution systems must be designed and restrained to withstand the forces generated by the seismic event without increasing the load transferred to the equipment. For applications where seismic hazard exists, it is preferred that bus, cable, and conduit enter and exit the bottom of the equipment enclosure.

Seismic certification of nonstructural components and equipment by Schneider Electric is just one link in the total chain of responsibility required to maximize the probability that the equipment will be intact and functional after a seismic event.  During a seismic event the equipment must be able to transfer the inertial loads that are created and reacted through the equipment’s force resisting system and anchorage to the load-bearing path of the building structural system or foundation.

Anchorage of equipment (for example, nonstructural supports and attachments) to the primary building structure or foundation is required to validate seismic conformance. The construction site structural engineer or engineer of record (EOR) or the Registered Design Professional (RDP) is responsible for detailing the equipment anchorage requirements for the given installation. The installer and manufacturers of the anchorage system are responsible for assuring that the mounting requirements are met. Schneider Electric is not responsible for the specification and performance of equipment anchorage systems.

The equipment enclosure provides anchorage tie-down points to accept anchor attachments to the building structure or foundation. Masterclad 27 kV Metal-Clad indoor enclosures provide enclosure base frame clearance holes for bolted anchorage attachments. Equipment installations must be anchored using all enclosure tie-down points as shown in Typical Floor Plan (Not for Construction).

 Equipment installations using welded supports and attachments in lieu of bolted supports and attachments must ensure the weld locations are distributed similarly to the locations of enclosure anchorage clearance holes.  Welded supports and attachments must be properly sized so that the weldment withstand capacity exceeds the earthquake demand at location of equipment installation. Precautions shall be made to properly vent and shield the equipment enclosure during the field welding process.  Schneider Electric is not responsible for equipment damage caused by field welded supports and attachments.

The bolted anchor assembly view depicted in Switchgear as Tested Anchor Assembly illustrates the equipment’s as-tested attachment to the seismic shake-table test fixture. The equipment seismic rated capacity, as stated on the Schneider Electric CoC, was achieved with the identified size and grade attachment hardware. For bolted attachments, the use of factory supplied Belleville conical spring washers, are required to maintain seismic conformance.  Field installed equipment attachment and support detailing shall be in accordance with the anchorage system requirements as defined by the construction site EOR or RDP.

Switchgear as Tested Anchor Assembly

Power cable connections must be insulated according to the switchgear kV rating and must meet the 27 kV system hi-pot dielectric requirements (see High-Potential (Hi-Pot) Testing).

Before making cable connections, install the cable compartment floor plates.

Insulating putty and tape (provided by customer) or other insulating means may be used to insulate the power cable connections.

1. Place insulating putty, such as 3M® Scotchfil®, around the lugs and bolts to reduce the concentrated field created by their irregular shapes (see Power Cable Connection Insulation). Apply a layer of Scotch® No. 13 (or equivalent) semiconducting tape over the insulating putty. Half-lap the tape, which layer must extend onto the conductor. Do not extend the tape up over the bus epoxy insulation. Apply Scotch No. 130C (or equivalent) tape over the No. 13 tape. Half-lap this tape for six layers. Extend the tape three inch (76 mm) up over the bus insulation and cable insulation.

2. Apply two layers of Scotch Brand No. 22 tape (or equivalent), extending the tape up over the No. 130C tape in all directions. The tape and other insulating materials for completing these field connections are not supplied with the switchgear.

3. If potheads or cable terminators are supplied for terminating power cables, follow the pothead manufacturer’s instructions for terminating the cables in these devices. To facilitate installation of the power cables, the bus side is not taped. After the cables are installed, insulate the pothead-to-bus connections according to the cable lug insulation instructions in this section.

Power Cable Connection Insulation