Power-Style™ QED-2 Switchboards
Section 4—Installation
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Section 4—Installation
Correct installation of Power-Style QED-2 switchboards is essential for proper
operation of all switchboard components. Study the associated instruction books
and all drawings carefully. In most cases, all drawings are sent to the purchaser
before a switchboard is shipped to enable adequate planning.
NOTE:
The top of the switchboard will not support the weight of the installer.
Location
Find the designated area on the building floor plan where the switchboard will be
installed. The location chosen for installation should provide working clearances
complying with Section 110-26 of the National Electrical Code
®
(NEC
®
) or Section
2-308 of the Canadian Electrical Code (CEC) Part 1.
•
Front-accessible switchboards require field connections, including mains,
branches, ground bus, and neutral bus, to be accessible and maintainable from
the front.
•
For switchboards having rear ventilation, allow a minimum 1/2-in. (13 mm)
clearance between the rear of the switchboard and the wall for proper ventilation.
Equipment drawings identify switchboards requiring rear or side access.
•
Switchboards that require rear access for installation, field connections, or
maintenance (such as filter replacement), require 30 in. (762 mm) of working
space per NEC 110-26.
•
If the switchboard is in a wet location or outside of the building, enclose it in an
outdoor enclosure or equipment to prevent moisture or water from entering and
accumulating within the enclosure. Outdoor-rated switchboards drain to the
rear, so there must be at least a 1/2-in. (13 mm) clearance between the rear of
the switchboard and a wall or other obstruction for proper drainage.
Foundation Preparation
The floor or foundation must be strong enough to support the weight of the
switchboard without sagging. The surrounding floor area should gently slope
toward a drain.
NOTE:
For seismic qualifications, read the section “Anchoring for Seismic
Qualifications” on page 18 before pouring the floor or foundation.
Power-Style QED-2 switchboards are assembled on true and level floors at the
assembly plant. To ensure correct bus bar alignment, the mounting pad or final
installation site must be smooth and level. If parallel steel floor channels are
imbedded for mounting the switchboard, take extra care to ensure the floor channels
are level over their entire length to avoid distortion of the switchboard structure. Each
channel should be level with the finished floor.
When pouring the foundation, make provisions for conduits entering the
switchboard from below and carrying the incoming and/or outgoing cables, control
wiring, and ground cable. The bottom view in the equipment drawing shows the
available conduit area for correct layout.
Conduits should project above the finished floor by about 2 in. (51 mm). However,
to simplify moving the shipping sections into place, install the conduits flush with
the concrete and, after the sections are in their final position, add the appropriate
extension sleeves. Otherwise, raising the shipping section on timbers or lifting it by
a crane to clear the conduit hubs will be necessary. Before pouring the foundation,
consider installing additional conduits for future circuits.
