Technical Overview

• Eleven-gauge steel enclosure is completely grounded

• ANSI 61 paint finish is a TGIC polyester powder applied electrostatically to yield a rugged surface coating

• Epoxy insulators

• Shatter-resistant glass viewing ports for visual confirmation of switch blade position

• Interlocked, removable front panels for fuse or cable access

• Sectionalized shipment, when required

• Sealed switch enclosure separate from the bus bar compartment and the fuse/cable compartment by the switch enclosure

• Electrically and/or mechanically interlocked fuse/cable access panel permitting entry to fuses or cables only when switch is open and grounded (optional). Mechanical interlock also functions for unfused applications

• Provisions for future expansion

• Full-length ground bus in multiple section enclosures

• Access panel interlock (electrical and/or mechanical) to block removal of the load-side panel while the switch is closed and/or the ground switch is open

• Switch interlock (electrical and/or mechanical) to block operation of the switch’s main contacts while the load-side panel is removed

• Provisions for padlocking the load-side panel

• Key interlocking is available when required

  The three, tin-plated copper bus bars are parallel mounted A, B, C, front to rear. 600 and 1200 A main bus is available. Connection is made to the fuses using field shapers.

• Bare copper ground bus is bonded to equipment frame

HVL/cc Components (Square D brand DIN style fuses shown in illustration as reference)

Compartment Types

HVL/cc Compartments

NOTE: The HVL/cc compartments are shown as shaded areas in the figures to the left.

Switch Compartment:

• Sealed for life in SF₆ gas

• Interruption in sealed enclosure

  • No external arcing

• Unaffected by the environment

Bus Compartment:

• Separate compartment isolated by switch insulation or sheet metal

• Houses three, parallel-mounted bus bars

• Rating for main bus:

  • 600 A (standard)

  • 1200 A (optional)

Fuse/Cable Compartment:

• Located below switch (Application A)

• Frame-to-frame steel barriers

• Accessed only after grounding switch is closed. (With ground switch option)

• Optional grounding of both sides of fuse available. (With internal ground switch and LDA–Application A ≤ 17.5 kV, 600 A only).

Low Voltage/Control Compartment:

• Separate low voltage and control compartment

• Space for metering and control components

Mechanism Compartment:

• Contains operators for switch and optional grounding switch

  • Optional motor with padlock provisions on control power disconnect switch

  • Optional close and open coils

• Standard LLIs:

  • Externally mounted neon indicating lights (one per phase)

• Externally accessible

Metering sections for user or utility equipment are available. They can be supplied fully equipped with necessary current transformers, potential transformers, meters, and associated devices, or with provisions only for installing utility components at the job site.

Standardized utility metering sections match the adjacent switchgear and incorporate all the special requirements of the utility.

Standard HVL/cc customer meter sections are 29.50-inch (750 mm) wide ≤ 17.5 kV and 39.37-inch. (1000 mm) wide for 25.8 – 38.0 kV.

On unfused switches, the load cables are connected directly to the terminals of the switch. Transformer cables are connected to the lower fuse holder/field shaper.

Cables may have either:

• Simplified terminations for dry-type, one- or three-core cables

• Heat-shrink ends for dry-type or paper-insulated cables

With basic equipment, the maximum cable sizes are:

• 4–500 kcmil/phase for 1200 A incoming or outgoing terminal chambers

• 2–500 kcmil/phase for 600 A incoming or outgoing switch cubicles

• 2–1/0 AWG/phase for switches incorporating fuses and direct coupled to transformers.

The optional grounding switch must be in the grounded position before the fuse/cable compartment can be accessed. The reduced depth of the cubicle allows for easy connection of all phases. An anti-rotation stud is incorporated in the field shaper. Schneider Electric-supplied lugs must be used with this switchgear.

Padlock provisions are standard for:

• Load interrupter switch

• Optional grounding switch

• Motor cut-off switch (if a motor operator is ordered)

Key interlocks are optional equipment. They are often suppled in conjunction with metal-enclosed switchgear to direct proper operation and coordination of the equipment. The key interlock schemes are usually described on the switchgear assembly drawings supplied with the equipment.

Panel Interlock Provisions