Power-Style™ QED-2 Switchboards Section 4—Installation
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ENGLISH
Service Equipment—
Ungrounded System
For ungrounded systems used as either service equipment, or as a main
switchboard on a separately derived system:
1. Run a grounding electrode conductor from the grounding electrode at the
installation site to the grounding electrode conductor connector (ground lug)
located on the switchboard ground bus (Figure 17 on page 26).
2. Select the material and size of this grounding electrode conductor to comply
with Sections 250-62 and 250-66 of the NEC or Sections 10-700 and 10-702 of
the 1998 CEC, and install it as specified in Section 250-64 of the NEC or
Section 10-204 of the 1998 CEC.
Not Service Equipment For either grounded or ungrounded systems, when a switchboard is not used as
service equipment nor as a main switchboard on a separately derived system:
Use equipment grounding conductors sized according to Section 250-122
of the NEC or Section 10-206 of the 1998 CEC to connect the switchboard
frame and ground bus to the service ground.
High-Impedance Grounded
Neutral Systems
For high-impedance grounded neutral systems:
Ground the system following the instructions provided with the system
grounding equipment and in compliance with Section 250-36 of the NEC.
Confirm that the switchboard frame and ground bus are bonded in accordance
with Section 250-102 of the NEC.
Busway Connections
Schneider Electric switchboards are manufactured with two different styles of
busway connections. Qwik Flange™ is used on indoor switchboards only.
The other type of busway connection is the “dummy” flanged end. This type is used
on some indoor switchboards, but primarily on outdoor units. The dummy flanged
end must be removed to allow actual busway flanged end installation. Either the
dummy or actual busway flanged end must be in place before energizing the
switchboard.
NOTE: Do not use the switchboard to support the weight of the busway
connection. Support busway independently. When busway is installed, make sure
no areas of the roof are bowed downward. This will help prevent pooling of water.
Busway Connection—NEMA
Type 1 (Indoor) Only
(Qwik Flange™)
Follow the instructions in this section to make Qwik Flange busway connections
(see Figures 20 and 21 on page 29):
1. Remove any protective covering from the opening in the switchboard.
2. Slip the busway joint into the switchboard connectors.
3. Check the joint bolt alignment; the center line (C/L) of the joint bolt to the
switchboard surface should be 0.95 in. (24 mm) (Figure 20 on page 29).
4. Attach the side closing plates using two 5/16-in. bolts (provided). When
installed properly, the holes in the side closing plates align with the holes in
both the switchboard and busway.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Turn off all power supplying the switchboard and busway before installing
connections.
Failure to follow these instructions will result in death or serious injury
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