Guide Form Specifications, Options

480V Metal-Enclosed Switchgear

Guide Form Specifications

General

Options

Switchgear Mounted Hoist

The hoist, optional on type R indoor switchgear, and standard on type SR outdoor switchgear, travels along rails on top of the switchgear to ease breaker handling.

TOC and MOC Switches

The Truck Operated Cell (TOC) Switch provides interlocking control or remote indication of the breaker racking position. The cubicle mounted auxiliary switch or Mechanism Operated Cell (MOC) switch provides interlocking control or remote indication based on the main contact position (open or closed).

The switches have field adjustable con- tacts for simple conversion of contacts from normally open (“a” type) to normal- ly closed (“b” type). Each contact may be adjusted individually without disassembly or removal of wiring.

Typical Outdoor Installation with Liquid Filled Transformer

MOC and TOC Switches. TOC Shown with Cover Removed.

Shutters

These provide protection against acciden- tal contact with primary disconnects in a compartment when the breaker is removed.

Wire Trough Covers

Secondary wiring is enclosed within each vertical section in the primary bus and outgoing cable areas.

Key Interlock

This provides a mechanical means for operating circuit breakers and other devices only when predescribed condi- tions are met.

PTS4 Test Set

Set allows testing of the full range of pro- tective settings of Static Trip III trip units.

Metering and Auxiliary Compartments

Compartments are available to house devices such as voltage transformers, metering, control power transformers, and supervisory devices.

Instrument and Control Transformers

Voltage transformers and control power transformers are mounted in auxiliary compartments. These transformers are protected by primary pull-out type cur- rent-limiting fuses and secondary fuses. Current transformers are normally mount- ed on the compartment primary discon- nect studs where they are readily acces- sible. See Tables 4.10, 4.11, 4.12, and 4.13 for available ratings.

Outdoor Switchgear

Type SR outdoor switchgear, available up to 4000 amp, is enclosed in a weather resistant (NEMA 3R) steel housing. All exterior doors extend below the floor line and are gasket sealed.

For protection from snow, rain, and dust, the switchgear rests on a six-inch, formed steel base which provides rigid support and a tight bottom seal. A heavy duty, coal tar emulsion protective under- coating is applied to the underside for protection against moisture and corro- sion. Shielded ventilation housings permit proper air circulation while excluding dust, dirt, and foreign matter.

A lighted, unobstructed service aisle is provided at the front of the switchgear allowing inspection and maintenance without exposure to the elements, An access door equipped with an emer- gency bar release is located at each end of the aisle. A GFI convenience outlet is included.

Accessories

Each switchgear assembly includes the following standard accessories:

JCrank for circuit breaker racking

JLifting bar assembly for all circuit breaker types

JSpring charging handle for electrically operated circuit breakers

As an optional accessory, a test cabinet is available for indoor use that is wall mounted with necessary equipment for testing electrically-operated breakers that have been removed from the breaker compartments.

Portable PTS4 Test Set

480V Metal Switchgear- Enclosed

CSI Section 16470	Siemens Electrical Products and Systems	53
	Specification Guide