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BU4.4:CP7043
November 1995
This bulletin describes the following products:
Type CP7043 System Cabinet Assembly
Type CP7901 Cable Tray
Type CP7921 Cabinet Grounding Kit
The Type CP7043 System Cabinet Assembly is an environmentally-sealed equipment enclosure that houses the CL6340-Series termination panels and
CL6350-Series intrinsic safety barriers. Cabinet dimensions allow the mounting of I/O termination panels in front and back. The cabinet may be joined side-to-side to form cabinet groups. Various wiring and cooling options may be selected to meet instrument requirements.
A base assembly consists of the following:
Cabinet frame with lifting eyes and leveling feet
High temperature sensor
Full-length front door with keylock
Top and bottom panels
A plinth-type cabinet base raises the cabinet assembly to allow bottom entry for power and signal wiring, if raised flooring is not used. The base has removable panels to allow use of a fork-lift or other lifting device for positioning of cabinets in the plant.
A high-temperature sensor, mounted at the inside top of the cabinet, supplies heat monitoring capability in each system cabinet assembly. The sensor is used in conjunction with the Type CP6103 System Power
Supply Unit, which provides the contacts to turn on an external alarm. For additional information on the Type
CP6103 System Power Supply Unit, refer to product bulletin, BU4.4:CP6103.
A rigid door frame provides integrity for the door. A continuous foamed-in gasket seals the cabinet when the door is closed. Doors are available with filtered lower cutouts used with top mounted fans, or with upper and lower filtered cutouts used with door mounted fans.
Removable metal plates in the top panel provide access for wiring. Top panels are available with cutouts for two fans. Solid top panels are used with door-mounted and fans and filters to qualify for NEMA
12 applications. Bottom panels provide adjustable three-part cable entry plates for entry access.
Side and back panels are available to fully enclose cabinets. All panels use foamed-in gaskets to seal panel and frame junctions. An optional rear door is available for access to rear-mounted I/O termination panels.
Vertical and horizontal wiring ways for hazardous-area field wiring are blue. Vertical ways for safe-area wiring are white.
When cabinets are bolted together in multi-bay combinations, side panels are not used between joined cabinets. Shipping considerations limit factory-assembled combinations to three bays.
Cabinet dimensions and details are shown in the following illustration.

BU4.4:CP7043
November 1995
Page 2
2.25
(57)
Top Panel With Fan Cutouts
Cabinet
(Front) 79
(2007)
Cabinet
(Side) 81.25
(2064)
17.75
(451)
31.5
(800)
1
(25.4)
31.75
(806.5)
19.75
(501.7)
ÉÉ
Fan Assembly
ÉÉ
ÉÉ
1.5
(38.1)
Extends outward from door or top panel
Plinth
(Top)
17.75
(451)
Plinth (Side)
17.75
(451) 4.04
(103)
31.6
(803)
Type CP7043 System Cabinet Assembly Dimensions
Cabinet assemblies are only available with EIA rails for rack-mounted instruments.
INCH
(mm) panels. The wiring terminates at the intrinsic safety barrier as shown in the illustration below.
The combination of doors with filtered cutouts and top or door mounted fans provide required cooling.
The field wiring from hazardous areas must be segregated from the wiring to non-hazardous areas.
Hazardous area wiring is routed through the blue vertical cabinet cable tray and through the blue horizontal cable tray on CL6340-Series termination

CL6340
Termination Panel
Front View
Intrinsic Safety
Barrier Modules
Blue Cable Tray
Inside Cabinet
BU4.4:CP7043
November 1995
Page 3
Side View
Termination
Panel
Module
3
1
Grounding Bar is Optional
Notes:
1 Field wiring must not be routed from the end of the blue cable tray.
2
3
Blue horizontal cable tray is provided on CL6340 termination panel.
See notes on Field Wiring.
Wiring and Cable Trays for the CL6350-Series Intrinsic Safety Barriers
2 Blue Cable Tray on
Termination Panel
3
2.0
(50.8)
INCH
(mm)
Hazardous area field wiring is never brought out of an open end of the blue horizontal cable tray on
CL6340-Series termination panels. The wiring is always routed through the slots in the side of the cable tray as illustrated below. The blanking partition outside the blue horizontal cable tray is designed to ensure that wires do not protrude from the bottom of the ducting slots, and are at least 2 inches (50.8 mm) from the components on the termination panel base.
Power and signal wiring enters the cabinet through a cutout in the top panel or a three-part plate in the bottom panel. Laminated power bus bars are used to distribute 24 Vdc power and ground from dc power supplies to the termination panels. Bus bars mount vertically inside the cabinet and have screw terminals spaced throughout their length.
Vertical cable trays are available for routing power and signal wiring between cabinet devices. Each cabinet with EIA rails includes a white horizontal cable tray that is mounted at the top. All other horizontal trays are included with rack-mounted instruments.
When an earth bar is installed on the termination panel, the intrinsic safety field wiring must be routed over the top of the bar and not allowed to droop or have any slack wiring.

BU4.4:CP7043
November 1995
Page 4
Internal
Mounting
Provisions
Bus-Bar
Assembly
Instrument Mounting Rear Panel: 70.13
inch (1781 mm) mounting height by 28.75
inch (730 mm) width
Laminated four-conductor bus bar with two equipment terminations spaced at 5.25
inch (133 mm) intervals. Two conductors for 24 Vdc, one for power supply common, and one for signal common. An additional three-conductor bus bar is supplied with rear door option.
High-
Temperature
Sensor
Rated at 5 A for 29 Vdc resistive loads.
Switch contacts open at 140 o F (60 o C) and close at 100 o F (38 o C)
Fan Unit 24 Vdc, 4.5 watts.
Air Capacity: 35 cfm (59 m
3
/h)
Signal Cable
Trays
Covered Plastic Cable Trays: Left side vertical tray is 3 inches (76 mm) wide by 5 inches (127 mm) deep by 72 inches (1829 mm) long. Right side vertical tray is 4 inches (101.6 mm) wide by 5 inches (127 mm) deep by 72 inches (1929 mm) long and is blue in color. The horizontal tray
(Type CP7901) is either 1.5 or 3 inches (38 or 76 mm) wide by 2 inches (50.8 mm) deep by 19.25 inches (489 mm) long
Cabinet
Hardware
EIA Mounting Rails: 70.13 inch (1781 mm) available rack height by 19 inch (483 mm) rack width. Maximum equipment depth is
14 inches (356 mm)
Cabinet
Support
Cabinet Base
Cabinet frame is a folded steel box section, with nine folds and material strength of up to 7 gauge (4.5 mm). Zinc die-cast corner joints and three dimensionally welded corners provide strength and rigidity. Bottom panels provide three-part cable entry plate with quick release clamps. Back and side panels, and doors are 14-gauge steel.
Continuous foamed-in gaskets on all panels provide an environmental barrier.
The four lifting eyes are rated at 1200 pounds (544 kg). Cabinet frame and panels have a durable, textured, pebble grey enamel finish inside and out.
Side-by-Side
Dimensions
Cabinet
Weight
Electromagnetic
Compatibility
Leveling Feet: Four leveling feet rated at
250 pounds (113.4 kg)
Optional plinth-type base mounts on the bottom corners of the cabinet frame and is
3.96 inches (100 mm) high by 31.46 inches
(799 mm) wide by 17.67 inches (449 mm) deep. Removable front and rear panels provide access for lifting equipment.
The width of quantity N cabinets is equal to
[(N x 31.50) + 0.25] inches, [(N x 800.1) +
6.3] mm.
Weight: Nominal 309.3 pounds (140.6 kg).
Blank side and back panels add 25 pounds
(11.3 kg)
Complies with European Standards
EN50081-2:1993 and EN50082-2:1995
The Type CP7901 Cable Tray mounts horizontally on standard EIA rails in a system cabinet and provides a path for safe area signal wiring and PROVOX r highway cables.
The cable tray is available in two widths.
Cable Tray Width: 1.5 or 3.0 inches (38 or 76 mm)
Depth: 2 inches (51 mm)
Length: 19.25 inches (489 mm)
Mounting Space: 1.75 or 3.5 inches
(44or 89 mm) or EIA rail space
Ground
Bus Bar
Brass or bronze stock, 0.25 by 0.75 by
19.25 inches (6 by 19 by 489 mm)
Terminals: forty-six, 6-32 flange head screws
Mounted inside cable tray with bolts
Ground Strap: Flat braided cable 8 inches
(203 mm) long and 0.31 inches (8 mm wide
Weight: 1.03 pounds (0.5 kg)

BU4.4:CP7043
November 1995
Page 5
The Type CP7921 Cabinet Grounding Kit provides a cabinet mounted, central termination point for all power supply circuits located in system cabinets. This local ground bus (LGB) is then connected to a single master ground bus (MGB) and then to a single dedicated earth ground for the instrumentation system. LGB assemblies and MGB assemblies are available separately.
Each local ground bus (LGB) assembly provides a central termination point for all power supply and signal common circuits within a cabinet group of eight bays or less. An assembly contains eight screw terminals each for power supply and signal common connections. It also includes two center tongue terminal lugs; one for battery backup return line and one for a master ground bus (MGB) assembly connection.
Local Ground
Bus (LGB)
Assembly
Master
Ground Bus
(MGB)
Assembly
Each MGB assembly provides a common termination point for up to six LGB assemblies. An MGB assembly contains seven center tongue terminal lugs. One lug is used for the earth ground connection and the other six are used for connection to LGB assemblies.
Cabinet
Ground
Wiring With one MGB connected to six LGB assemblies, each of which is connected to eight cabinets, the power supply circuits of up to 48 cabinets can be connected directly to earth ground. If more than 48 cabinets are used, additional grounding kits must be specified. When no more than eight cabinets are used, the LGB assembly lug that is normally connected to an MGB assembly is connected directly to a single dedicated system earth ground.
15 by 0.875 by 0.25 inches (381 by 22 by
6 mm)
Sixteen power supply and signal common connections
Two copper or bronze center tongue lugs or battery backup and ground bus connections
Weight: 2.25 pounds (1.02 kg)
Copper stock, 15 by 2 by 0.375 inches
(381 by 51 by 10 mm)
Seven copper or bronze center tongue terminal lugs accepting 1/0 to 4/0 AWG
(53.46 to 107.25 mm 2 ) wire
Weight: 6.9 pounds (3.11 kg)
Wire Size: 8 AWG (8.37 mm 2 ) copper wire in lengths of 54, 99, or 144 inches (1372,
2515, or 3658 mm) supplied as required by cabinet configuration.
Weight: Wiring assembly for one to three cabinets (in-line), 2.8 pounds (1.28 kg).
For two to eight cabinets (back-to-back),
7.3 pounds (3.32 kg). For four to eight cabinets (in-line), 7.9 pounds (3.58 kg).
When ordering specify —
Solid panel
No panel
Includes cabinet with front EIA rails, power bus bar, right and left vertical cable trays
Solid Panel
Bolt kit for connecting cabinets side by side (no panel used)
Solid panel
Panel with fans
Lower-mounted filters (use with top panel and fans)
Lower-mounted filters and upper-mounted fans

BU4.4:CP7043
November 1995
Page 6
Solid panel
Rear door with lower-mounted filters, rear EIA rails, power bus bar, right and left vertical cable trays
Rear door with lower-mounted filters, power bus bar, right and left vertical cable trays. No EIA rails.
Leveling Feet
Plinth-type base
1.5 inch (38 mm) cable tray
3 inch (76 mm) cable tray
Local Ground Bus Assembly
Single cabinet
One to four cabinets
Five to eight cabinets
Master Ground Bus Assembly

Fisher-Rosemount Systems, Inc. 1995. All rights reserved. Printed in USA.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
PROVOX is a mark of one or more of the Fisher-Rosemount group of companies. All other marks are the property of their respective owners.