NetSure
™
-48 VDC Power System
Installation Instructions, IM582127000100 (Revision A, January 9, 2017)
Spec. No: 582127000100, 582127000103
Document Code: IM582127000100
Model No: 7100
Revision A, January 9, 2017
[20]
Relay Rack Grounding Connection (Frame Ground)
For relay rack grounding requirements, refer to the current edition
of the American National Standards Institute (ANSI) approved
National Fire Protection Association's (NFPA) National Electrical
Code (NEC), applicable local codes, and your specific site
requirements.
A customer's grounding network lead can be attached to the top
of the relay rack. Provision is made for installing a lead with a two-
hole lug that has 1/4" bolt clearance holes on 5/8" centers. When
using 1/4-inch hardware, recommended torque is 84 in-lbs when a
standard flat washer and lock washer are used. Refer to
for locations.
NOTE: REMOVE TAPE FROM HOLE LOCATIONS BEFORE
INSTALLING LUG.
NOTE: The DC return connection to this system can
remain isolated from system frame and chassis (DC-I).
NOTE: This system is suitable for installation as part of
the Common Bonding Network (CBN).
Figure 15.
Relay Rack Frame Grounding Connection Points
Central Office Ground Connection
Landing points are provided on the battery return bus for a central
office ground lead (see
). For central office grounding
requirements, refer to the current edition of the American
National Standards Institute (ANSI) approved National Fire
Protection Association's (NFPA) National Electrical Code (NEC),
applicable local codes, and your specific site requirements.
Nominal 208 VAC / 240 VAC Input and Equipment
Grounding Connections
DANGER! Adhere to the “Important Safety Instructions”
presented at the front of this document.
Wiring Considerations
Refer to
for recommended wire sizes and branch circuit
protection.
Connections to AC Input Termination Assemblies
The AC input termination assemblies provide circular openings at
the top for AC input and grounding conductors. The openings
accept 1 inch conduit fittings. It is recommended that AC input
wiring be provided to all rectifier mounting positions, including
currently unused positions. This wiring will ease future installation
of rectifiers to meet increased load requirements.
NOTE: A grounding conductor must be provided with
each conduit.
Procedure
Refer to
as these procedures are performed.
Accessing Connections and Routing Wire
1.
Remove the two AC input connector covers from inside
the distribution cabinet.
2.
Install conduit fittings as required in the top of the AC
input termination assembly. Plug buttons are provided,
and must be installed in the openings not being used.
3.
Route wiring into the AC input termination assembly
through the previously installed conduit fittings.
Making AC Input Connections
1.
Make AC input connections as shown in
Connect each wire by inserting the stripped end into the
wire opening, and then tightening the screw. Torque
connections to value shown in
Making Equipment Grounding Connections
NOTE: Make equipment grounding connections to earth
ground, not to the branch circuit neutral conductor.
1.
Connect equipment grounding leads to the frame
ground studs using installer-provided lugs and factory-
supplied mounting hardware. Torque connections to
value shown in
Frame Ground
Connection Point
(1/4” threaded holes on 5/8” centers)
Top View
(Typical Relay Rack)
Danger
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