Powering The Enclosure; Grounding The Rack; Intracabinet Grounding For Seismic Racks; Rack To Ground - HP BladeSystem c7000 Setup And Installation Manual

Powering the enclosure

Grounding the rack

Intracabinet grounding for Seismic Racks

Each seismic rack has two grounding rails at the rear of the cabinet in front of the mounting rails.
Grounding rails are covered by metal foil in the seismic rack and conductive paint in the R2 rack.
Ground cables are green with a yellow stripe and are used to connect an enclosure to the cabinet
grounding rail. Green hex-head ground screws and star washers secure the green ground cables
to the grounding rail.

Rack to ground

The rack requires its own ground connections to the site Common Bonding Network. The ground
connection must have the same cable gauge as the largest power cables attached to the rack.
There are two designated grounding locations at the top front and top rear of the rack. These
locations accommodate listed compression lugs up to 2/0 (two-hole, 0.63-inch spacing). If larger
lug sizes are required (up to 500 kcmil), you must mount the listed lugs to the vertical ground rails
(two-hole, 1.0-inch spacing). Mount all lug sizes to the ground rails, using the M6 self-threading
hex screws in the rack hardware kit. Tighten the hex screws to 40 in-lb (4.5 Nm). The lugs are not
provided with the rack, since the size of these lugs is based on system configuration, site layout,
and local electrical codes.
When grounding the rack:
Use cable of the same AWG as the DC input power conductors.
To ensure proper ground contact and to prevent rotation, use star washers between the terminal
and the rack rail.
Coat bare connectors with an antioxidant before making any crimp connections.
Use ground conductors that are stranded copper and conductors with green or green and
yellow insulation.
Connect any conductor that is #6 AWG or larger, using a listed two-hole compression type
connector per GR- 1 089, R9-25 and TR-295.
CAUTION:
The assembly and connection of site power and ground cables should only be done by a certified
electrician.
The seismic rack and seismic rack R2 are suitable for installation as part of a Common Bonding
Network (CBN).
To ensure proper electrical contact when grounding the seismic rack or seismic rack R2:
Use a ground cable of the same or larger size than the largest DC input power conductors,
using a 40° C correction factor.
Use a cable constructed of copper, 75° C minimum rated.
Use only Listed two-hole copper compression-type lugs for the ground connector.
Before making any crimp connections, coat the bare wire and base connectors with
anti-oxidant.
Use star washers between the lug and the rack ground rail to ensure proper ground contact
and anti-rotation.
To connect the rack to the CBN, connect to one of the following rack ground points. There are two
ground connections at the top of the rack (front and rear) and two ground connections at the bottom
52 Cabling and powering the enclosure
Site power (rails A & B) and site ground cables must be provided by the customer.