GE Industrial Solutions AKD-20 Low Voltage Switchgear - Manuel (Page 28)

AKD-20 Low Voltage Switchgear
Chapter 4. Equipment Installation
28 ©2012 General Electric All Rights Reserved
4-1 General
This chapter contains complete instructions for installing General
Electric AKD-20 Low-voltage Switchgear.
CAUTION: Personnel installing this equipment must be
thoroughly familiar with this instruction manual and all articles of
the National Electrical Code applicable to the installation of this
switchgear. In addition, all drawings, both mechanical installation
and electrical, must be understood and strictly followed to
prevent damage to the switchgear or equipment being protected
by the switchgear.
ATTENTION: La ou les personnes procédant à l’installation de cet
équipement doivent être tout à fait familier avec ce livre
d’instruction ainsi que tous les articles du Code national
d’électricité s’appliquant à l’installation de ce dispositif de
commutation. De plus, tous les dessins se rapportant tant à
l’installation mécanique qu’électrique doivent être compris et
suivis à la lettre afin de prévenir des dommages au dispositif de
commutation ou à l’équipement protégé par celui-ci.
NOTE: Before installation work is started, it is important to
review all of the drawings provided, including the General Electric
equipment arrangement drawings, site installation drawings,
elementary and remote connection drawings, mechanical
connection drawings, and the summary of equipment list.
NOTE: Il est important de reviser tous les dessins fournis, incluant
les dessins de disposition de l’équipement de General Electric, les
dessins d’installation du site, les dessins de raccords
élémentaires et à distance, les dessins de raccords mécaniques
et le sommaire de la liste d’équipement avant que ne débutent
les travaux d’installation.
All expendable hardware for shipping purposes only, is painted
yellow or tagged with yellow adhesive tape and may be discarded
at completion of the installation phase.
Site Location
In general, the location of the switchgear equipment will have been
predetermined during the specification and/or procurement of
equipment phases. Indoor locations within buildings impose certain
requirements which must be met so that the switchgear may
operate efficiently with a minimum of maintenance.
In locating the AKD-20 Switchgear, adequate aisle space must be
provided at the front and rear of the equipment to ensure proper
ventilation of the equipment and to allow service and maintenance
of the equipment with the front and rear doors open. The
recommended aisle space is shown on the floor plan supplied with
the equipment drawings.
The switchgear equipment should be placed in an area where clean,
dry air is free to circulate around and above it. Since air is taken
into the equipment at the bottom of each section and exhausted at
the top, a location with good airflow must be provided for efficient
operation. A minimum of 30 inches of clear space above the
equipment is recommended.
Foundation Requirements
For optimum performance of your General Electric switchgear
equipment, the foundation requirements expressed in this chapter
should be strictly adhered to.
NOTE: The foundation for the outdoor switchgear must provide
proper drainage of ground and/or surface water accumulations
away from the equipment.
NOTE: La fondation du dispositif de commutation situé à
l’intérieur doit être en mesure de drainer correctement les
accumulations d’eau du sol et de surface loin de l’équipement.
The foundation must be strong enough to prevent sagging due to
the weight of the switchgear structure and to withstand the shock
stress caused by the opening of the breakers under fault conditions.
The shock loading is approximately 1-1/2 times the static load.
The foundation must be flat and level in all planes. Refer to Figure 4-
1 for definition of flat and level.
Fig. 4-1. Definition of flat and level
Foundation Preparation
Indoor Equipment
Refer to Fig. 4-2 along with the owner's foundation construction
drawings, and the General Electric supplemental installation
drawings. Although the indoor switchgear equipment can be
mounted directly on a smooth, level floor, it is recommended that
recessed steel channels be installed for supporting the equipment.
Anchor bolts and channels are to be provided by the purchaser.
NOTE: When the equipment is installed on a surface subject to
impact (shock) loads due to operating conditions or
environmental seismic (earthquake) conditions, the anchor bolts
should be fabricated of medium carbon steel (grade 5 load
rating).
NOTE: Lorsque l’équipement est installé sur une surface sujette
à des charges d’impact (choc) causées par les conditions
d’opération ou des séismes environnementaux (tremblements
de terre), les boulons d’ancrage devraient être fabriqués d’acier
à moyenne teneur en carbone (spécification de charge classe
5).