Semi-Assembled Switchgear

SureSeT Semi-Assembled switchgear, based on Square D brand SureSeT Fully Assembled medium voltage metal-clad indoor switchgear, is available for use by an OEM to develop a final switchgear design. Semi-Assembled switchgear sections are intended to be used only with EvoPacT Medium Voltage Vacuum Circuit Breakers. The Schneider Electric documents NNZ9886800, SureSeT Medium Voltage, Metal-Clad, Indoor Switchgear User Guide and JYT3013100, EvoPacT™ Medium Voltage Vacuum Circuit Breaker (VCB) should be used as reference user guides by the OEM when designing with the SureSeT Semi-Assembled switchgear.

SureSeT Semi-Assembled switchgear may contain these design features:

• One-high and two-high construction, with circuit breakers on the top and/or bottom.

• Individually-grounded, compartmentalized, steel structures.

• Doors, barriers, covers, and/or removable access panels/plates to isolate the separate working functions.

• A rating nameplate, showing rating information and factory order number, typically located on the top of each low voltage compartment.

Each assembly has standard structures and optional items configured according to customer specifications. Control and secondary circuits and devices are, typically, not installed on semi-assembled switchgear from the factory. The structures are then combined with the EvoPacT circuit breaker and other components by the OEM to manufacture the OEM final, fully assembled switchgear equipment for use.

The same instructions and guidelines required for fully assembled SureSeT switchgear apply for semi-assembled switchgear. For instructions regarding receiving, handling, storage, detailed product descriptions, site selection, site preparation, foundation, installation, usage, start-up, testing, inspection, and maintenance refer to Schneider Electric document NNZ9886800, SureSeT Medium Voltage, Metal-Clad, Indoor Switchgear User Guide.

Ensure adequate bracing of OEM electrical bus and other switchgear components incorporated and mounted to SureSeT equipment. Ensure adequate ventilation in breaker compartments and overall switchgear equipment. Not allowing proper ventilation may impact the thermal performance of the equipment.

DANGER

hazard of electric shock, explosion, or arc flash For semi-assembled switchgear, adhere to the same instructions and guidelines required for fully assembled switchgear. Do not install or use semi-assembled switchgear as final equipment. Only install or use semi-assembled switchgear that has been produced as final, usable equipment by an OEM manufacturer. OEM manufacturers must test and validate final equipment for use by customers. OEM manufacturers must take responsibility for final equipment used by customers. Use adequate bracing, in the final equipment, for OEM electrical bus and other switchgear components. Do not impede upon the ventilation of SureSeT switchgear compartments. Respect the boundary of the EvoPacT cradles for added switchgear parts. No parts are permitted within the envelope of the cradles. Use only Square-D EvoPacT circuit breakers with SureSeT Semi-Assembled switchgear. Failure to follow these instructions will result in death or serious injury.

The semi-assembled switchgear front sub-section may contain a customer-selected combination of the following:

• Hinged doors with door-mounted low-voltage indication, protection, and control devices

• Dedicated low-voltage, instrumentation compartment

• Circuit breaker compartment(s) (upper/lower compartments)

• Auxiliary compartment(s) (voltage transformer drawers/control power transformer drawers/fixed low power voltage transformers).

The section identifies the circuit breaker compartment position as either upper or lower, and the auxiliary compartments as position A, B, C, or D. Refer to the Schneider Electric document NNZ9886800, SureSeT Medium Voltage, Metal-Clad, Indoor Switchgear User Guide for more details.

Each compartment may have its own hinged door which comes with thumb screws as standard but can also be equipped with a handle with padlock and keylock options. Low voltage instruments, relays, control panel, terminal blocks, fuse blocks, and other indication, protection, and control devices may be mounted on the hinged doors. In some door applications, a flat panel attached to the door frame provides a customizable mounting space for these low voltage devices, see the figure Flat panels on MV doors: a) Front View b) Back Exploded View. These flat low voltage device panels are mounted onto studs welded in the hinged door frame and are secured with HN ASS SAE J238 1/4-20 Steel Nuts (nut and conical spring washer assemblies). A ground wire from the OEM switchgear compartment to the door should be connected onto one of the studs under one of these nuts with a 5/16 external tooth steel lock washer. Refer to the Schneider Electric document NNZ9886800, SureSeT Medium Voltage, Metal-Clad, Indoor Switchgear User Guide for more details.

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Follow the design recommendations in this guide and the Schneider Electric document NNZ9886800, SureSeT Medium Voltage, Metal-Clad, Indoor Switchgear User Guide for installing devices on the doors. Failure to follow these instructions will result in death or serious injury.

Semi-assembled sections have dedicated, grounded, compartmentalized, heavy gauge steel compartments to house low-voltage OEM instrumentation devices. The size of the compartment will vary based on the configuration of the section. The compartment may house OEM devices such as:

• Indication devices

• Protection relays

• Control panel

• Terminal blocks

• Fuse blocks

• Power meters

• The wiring space for inter-section wiring and a customer’s control wiring connections.

Every section, regardless of configuration, also has a dedicated wireway, accessed through the roof, which can also be used for OEM inter-section wiring and customer control wiring connections. Refer to Schneider Electric document NNZ9886800, SureSeT Medium Voltage, Metal-Clad, Indoor Switchgear User Guide for more details.

Semi-assembled switchgear does not contain factory-assembled wiring. Example routes and access points for the circuit breaker power and control, MOC, TOC, and auxiliary wiring are described in this section. These routes within the switchgear are shown only as recommendations and are not required for final OEM switchgear design. For details on the wire routing contained within the circuit breaker cradles, refer to Wire routing for circuit breaker cradles. The rectangular cutouts on the sides may be used to route cables from the upper compartment to the LV compartment, see the figure Typical routing from upper compartment to LV compartment. Similarly, the rectangular cutouts on the sides may be used to route cables from the lower compartment to the LV compartment, see the figure Typical routing from lower compartment to LV compartment. The LV compartment can also be accessed through the knockouts on the rear panel. Cables may be routed through the knockouts to access the back panel of the LV compartment, see the figure Typical routing through rear of LV compartment.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH When installing the wiring within the breaker and auxiliary cradles, follow only the wire routing instructions and models provided in this user guide. Ensure the wires are routed so that the wire bundles do not interfere with any mechanical parts in the circuit breaker cradle, auxiliary cradle, LV compartment, or on the circuit breaker. It is recommended to cover all wires with protective sleeving everywhere in the equipment except inside the low voltage compartment. Failure to follow these instructions will result in death or serious injury.

To route the cables in the auxiliary compartment, follow the cutout at the back and route the cables in between the rail and the side sheet to avoid any interference with the movement of the auxiliary drawer, see the figure Typical wire routing in auxiliary compartment. Use rectangular cutouts on both sides to route the cables from the auxiliary compartment to the LV compartment, see the figure Typical wiring routing from auxiliary compartment to LV compartment.

The dedicated low voltage compartment provided in each section allows access to assemble OEM wiring panels with OEM low voltage devices and harnesses. Refer to Typical low voltage wiring panels with wiring. A flat panel can be mounted to some switchgear compartment doors, on which to mount OEM low voltage devices. Refer to Flat panels on MV doors: a) Front View b) Back Exploded View. The drawings for the flat LV panels for some typical breaker and auxiliary door configurations have been provided in the following figures:

• Breaker door LV panel dimensions without handle

• Breaker door LV panel dimensions with handle

• Auxiliary door (position A, B, and C) LV panel dimensions

Contact the local Schneider Electric representative for drawings of other LV door panel configurations or dedicated LV compartment doors.