General Description; Introduction; Scope - Siemens WL Series Instruction & Installation Manual

Type WL Low Voltage Metal-Enclosed Switchgear

General Description

Figure 1. Typical Indoor Type WL Switchgear

Introduction

The successful performance of Metal-Enclosed Switchgear
depends as much on proper installation and maintenance as it
does on good design, careful manufacture and correct application.
Siemens Type WL Metal-Enclosed Switchgear is precision built
equipment designed to function efficiently under normal
operating conditions. It is designed and manufactured to
operate within the ANSI C37 standards for Metal-Enclosed
Low Voltage Switchgear. Performance requirements of these
standards have been met or exceeded by these designs.
The principal standard which applies is:
C37.20.1 Metal-Enclosed Low Voltage Switchgear
The instructions included in this manual are provided to aid you
in obtaining longer and more economical service from your
Siemens switchgear. For proper installation and operation, this
information should be distributed to your operators and engineers.
By carefully following these instructions, difficulties should be
avoided. However, they are not intended to cover all details of
variations that may be encountered in connection with the
installation, operation and maintenance of this equipment.
Should additional information be desired, including replace-
ment instruction books, contact your Siemens representative.
Courtesy of NationalSwitchgear.com

Scope

These instructions cover the installation, operation and main-
tenance of Siemens Type WL metal-enclosed low voltage
switch gear assemblies, using Type WL low voltage power
circuit breakers. The equipment described in this manual
consists of indoor or outdoor designs for application up to
600 Volts. A typical indoor Type WL switchgear assembly
is shown in Figure 1.
Standard construction details of the switchgear, auxiliary
equipment and necessary accessories are given in the appropri-
ate sections. Special mechanical and electrical devices, furnished
in accordance with purchase order requirements, are covered
by supplementary instructions submitted with this instruction
book. Ratings described in this manual are in accordance with
UL, NEMA, IEEE and ANSI standard requirements.
The equipment furnished has been designed to operate in a
system having the circuit capacity specified by the purchaser.
If for any reason the equipment is later used in a different sys-
tem, or if the short-circuit capacity of the system is increased,
the bus bracing (momentary) and short time ratings of the
switchgear, the interrupting capacity of the circuit breakers
and the bus capacity must be checked. Failure on the part
of the user to receive approval of intended changes from
Siemens may cause voiding the warranty.
General Description
The switchgear described in this manual is of the metal-enclosed
type. The switchgear sections described are comprised of full
depth structural frames and components providing separate
compartments for drawout breakers, buses, and auxiliary equip-
ment. In addition, the section main bus and intersection bus
work may be isolated (optional) from the primary entrance cable
area with segregating barriers. Interlocks are provided, where
necessary, to insure proper sequence and safe operation.
Type WL indoor switchgear consists of one or more vertical
sections secured together as a single group. It is completely
operational when installed and connected to purchaser's
power supply. When connected directly to a power transformer,
a 14.9" (381.4mm) wide transition section may be provided to
adjust connections to the proper elevation. Circuit breaker com-
partments are provided with hinged access doors for installing
or removing circuit breakers. Auxiliary compartments are
designed with hinged panels for mounting of instruments,
relays and switches.
Type WL outdoor switchgear is similar to indoor switchgear,
except that it is enclosed in a weather resistant (NEMA 3R)
steel housing. The equipment is designed so that weather
conditions will not affect operation of the switchgear. In the
walk-in outdoor enclosure, an illuminated service aisle is
provided at the front of the switchgear allowing inspection
and maintenance without exposure to the elements. An
access door is provided at each end of the aisle wall in the
walk-in outdoor enclosure with panic bar latch release inside
the aisle. The rear of each vertical section is equipped with
a door for access to the primary cable entrance area.
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