Eaton Series NRX Manual

Series NRX drawout and breaker
three-way cable interlock installation
and removal instructions
mWARNING
(1) ONLY QUALIFIED ELECTRICAL PERSONNEL SHOULD BE PERMITTED TO WORK
ON THE EQUIPMENT.
(2) ALWAYS DE-ENERGIZE PRIMARY AND SECONDARY CIRCUITS IF A CIRCUIT
BREAKER CANNOT BE REMOVED TO A SAFE WORK LOCATION.
(3) DRAWOUT CIRCUIT BREAKERS SHOULD BE LEVERED (RACKED) OUT TO THE
DISCONNECT POSITION.
(4) ALL CIRCUIT BREAKERS SHOULD BE SWITCHED TO THE OFF POSITION AND
MECHANISM SPRINGS DISCHARGED.
FAILURE TO FOLLOW THESE STEPS FOR ALL PROCEDURES DESCRIBED IN THIS
INSTRUCTION LEAFLET COULD RESULT IN DEATH, BODILY INJURY, OR PROPERTY
DAMAGE.
mWARNING
THE INSTRUCTIONS CONTAINED IN THIS IL AND ON PRODUCT LABELS HAVE TO
BE FOLLOWED. OBSERVE THE FIVE SAFETY RULES:
– DISCONNECTING
– ENSURE THAT DEVICES CANNOT BE ACCIDENTALLY RESTARTED
– VERIFY ISOLATION FROM THE SUPPLY
– EARTHING AND SHORT-CIRCUITING
– COVERING OR PROVIDING BARRIERS TO
ADJACENT LIVE PARTS
DISCONNECT THE EQUIPMENT FROM THE SUPPLY. USE ONLY AUTHORIZED
SPARE PARTS IN THE REPAIR OF THE EQUIPMENT. THE SPECIFIED MAINTENANCE
INTERVALS AS WELL AS THE INSTRUCTIONS FOR REPAIR AND EXCHANGE MUST
BE STRICTLY ADHERED TO PREVENT INJURY TO PERSONNEL AND DAMAGE TO
THE SWITCHBOARD.
Instructions apply to:
UL489 Series NRX RF Frame
IEC IZMX40
Effective June 2016 Series NRXInstruction Leaet IL01301060E

2
Series NRX drawout and breaker
three-way cable interlock installation
and removal instructions
EATON www.eaton.com
Instructional Leaet IL01301060E
Effective June 2016
Figure 1. Kit contents.
(A)
(B)
(C)
(D)
(E)
(F)
(G) (H)
(I)
(K)
(L)
(Ja)
(Jb)
ote:N The content of this IL applies to both PXR and Digitrip equipped breakers.
Appearance of product may vary.
Section 1: General information
The mechanical interlock holds one or more of the breakers tripped
(prevents closure) when one or more of the others is closed. A lever
assembly is mounted on each breaker and interfaces with the pole
shaft and tripper bar. The lever assemblies are interconnected with
cables. Cables can be used for any orientation of the breakers, and
are available in 5, 6, 8 and 10-foot lengths (1.5, 1.8, 2.4, and 3.0 m).
Individual cable kits are ordered separately.
Required tools
• 10 mm socket drive socket
• 11/16-inch open-end wrench
• 3/8-inch open-end wrench
• 3/8-inch socket drive socket
• 4 mm feeler gauge
• 2 mm Allen wrench
• Drive extension
• Adjustable wrench
Kit Parts identification
Refer to Figure 1 for visual identification of the parts listed below.
(A) Trip pin (3)
(B) M3 x 16 mm flat-head screw (3)
(C) M6 x 12 mm hex bolt (12)
(D) Lock washer (12)
(E) Drive arm (3)
(F) M6 x 30 mm flat-head screw (3)
(G) Cable bracket - type 31 (8) or types 32 and 33 (12)
(H) M6 x 10 mm thread-forming screws - type 31 (8) or types 32 and
33 (12)
(I) Grease tube (1)
(Ja) Interlock assembly types 31 or 33 (3)
(Jb) Interlock assembly type 32 (3)
(K) Cable assembly - type 31 (4) or types 32 and 33 (8) - 5, 6, 8 and
10-foot lengths (1.5, 1.8, 2.4, and 3.0 m)
(L) Long spacer tube (3)

3
Instruction Leaet IL01301060E
Effective June 2016
Series NRX drawout and breaker
three-way cable interlock installation
and removal instructions
EATON www.eaton.com
Section 2: Installation of three-way cable
interlock
Proceed with the following 9 steps.
Step 1: Remove the four screws (six for 4-pole breaker) holding the
cover in place. Pull down on the charging handle and remove the front
cover.
Step 2: Remove the three screws holding the levering device side
plate then remove the levering device side plates.
Figure 2. Steps 1 and 2.
Step 3: Install the drive arm (E) to the end of the pole shaft using an
M6 x 30 mm flat-head screw (F). The drive arm should be oriented as
shown. Torque to 65-85 in.-lbs (7.3 - 9.6 N•m).
Step 4: Install the trip pin (A) to the trip arm using an M3 x 16 mm flat-
head screw (B). Use a wrench to hold the trip lever during installation.
Torque to 3-5 in.-lbs (0.3 - 0.6 N•m). Replace Lev-in side plate (Figures
3 and 4).
Figure 3. Steps 3 and 4.
(A) Trip pin
(E) Drive
arm
Figure 4. Steps 4.
Step 5: Fasten the interlock assembly (J) to the drawout cassette’s
right-side sheet using four M6 x 12 mm hex bolts (C) and four lock
washers (D). Torque to 40 - 50 in.-lbs (4.5 - 5.6 N•m).
Figure 5. Step 5.
Step 6: For type 32 and 33 interlock kits, fasten four cable brackets
(G) to the drawout cassette’s right-side sheet just below the interlock
assembly (mounted in Step 5) using two M6 x 10 mm thread-forming
screws (H). Torque to 65 - 85 in.-lbs (7.3 - 9.6 N•m) (refer to Figure 8
for the correct configuration of type 31 interlock kits).
Align as shown
(C) and (D)

4
Series NRX drawout and breaker
three-way cable interlock installation
and removal instructions
EATON www.eaton.com
Instructional Leaet IL01301060E
Effective June 2016
Figure 6. Step 6.
Step 7: Before reattaching the cover, the drive arm window must be
removed from the side of the cover (Figure 7). Either use a utility knife
to cut the window from the cover, or use a punch and a small hammer
to carefully punch out the window. Once the window is removed,
use a small file to remove any burrs that remain. Make certain that all
pieces and/or particles are cleaned up and removed before proceeding.
Figure 7. Step 7.
mATTENTION
FIGURE 8 SHOWS THE TYPICAL CABLE ROUTING FOR BOTH TYPES 31 AND
33 INTERLOCKS AND FIGURE 9 SHOWS THE TYPICAL ROUTING FOR TYPE
32 INTERLOCKS. THE CABLE MOUNTING ON THE DRIVE SIDE IS THE SAME
FOR ALL TYPES. MOUNTING FOR THE DRIVEN SIDE OF TYPES 31 AND 33 IS
SHOWN IN FIGURES 14-16. MOUNTING FOR THE DRIVEN SIDE OF TYPE 32 IS
SHOWN IN FIGURES 17-20.
Step 8: This step offers cable routing and installation procedures.
Make sure that cables move freely in their cable housings before
installation.
(G)
(H)
Remove drive
arm window
Installation recommendations:
•
4 inch (102 mm) minimum allowable cable housing bend radius
• Use plastic wire ties/clamps to attach cable housing to structure
after installation and adjustment
• Do not compress cable housing
• Recheck to ensure cables move freely
Figure 8.
T
ype 31 cable routing Type 33 cable routing.
Step 8.

5
Instruction Leaet IL01301060E
Effective June 2016
Series NRX drawout and breaker
three-way cable interlock installation
and removal instructions
EATON www.eaton.com
Figure 9. Step 8.
Step 9: This step describes how to first attach the drive (short rod) end
of a cable to its interlock assembly and cable bracket. See Figures 10
to 14 for details.
1. Remove small nut, compression spring and spacer tube from end
of rod.
2. Slide rubber boot toward tip of rod.
3. Unthread outer bulkhead nut and slide nut and lock washer toward
tip.
4. Insert threaded end of rod into swivel fitting.
5. Slide smaller diameter portion of bulkhead fitting into cable bracket
slot (see Figure 12).
6. Raise cable assembly until threaded portion of bulkhead fitting
enters slotted hole in cable bracket (threads show above bracket).
7. Bring bulkhead washer and nut down to threads and hand tighten.
8. Adjust two bulkhead nuts to approximately center bulk head fitting
on cable mounting bracket.
9. Hand tighten bulkhead nuts only at this time.
10. Slide rubber boot back into place over end of bulkhead fitting.
11. Replace spacer tube, compression spring and small nut on end of
rod.
12. Lower nuts should be shouldered against end of thread and upper
nut tightened against spacer tube (see Figure 13).
13. Hold lower nuts and torque upper nut to 30 - 40 in.-lbs
(3.3 - 4.5 N•m).
Type 32 cable routing
Figure 10. Step 9.
Figure 11.
Rubber boot
Bulkhead nut
Outer
bulkhead nut
Lower nuts
(should be shouldered
against end of thread)
Threaded end
Spacer tube
Compression
spring
Upper nut
Step 9 - Cable assembly (details).
Swivel
fitting
Drive end
cable bracket
Rubber boot
Drive end
(short rod)

6
Series NRX drawout and breaker
three-way cable interlock installation
and removal instructions
EATON www.eaton.com
Instructional Leaet IL01301060E
Effective June 2016
Figure 12.
Slide smaller
diameter portion of
bulkhead fitting into
cable bracket slot.
Raise cable assembly
until threaded portion
of bulkhead fitting
enters slotted hole in
cable bracket (threads
show above bracket).
Step 9 - mounting cable assembly in cable bracket.
Figure 13. Step 9.
Step 10: This step describes how to attach the driven (long rod) end of
a cable to its interlock assembly and cable bracket on another breaker.
This is accomplished by repeating Step 9, except the driven end does
not utilize a compression spring between the swivel and outer nut.
Replace short spacer tube on cable with the long spacer tube from this
kit. Install the second cable.
Figure 14. Step 10.
Upper nut
(tighten against
spacer tube)
Compression
spring
Swivel fitting
Lower
nuts
Trip arm
Upper nut
(tighten against
spacer tube)
Compression
spring
Swivel fitting
Lower nuts
Rubber boot
Outer bulkhead
nut
Bulkhead nut
Driven end cable
bracket
Swivel fitting
Driven end
(long rod)
Lower nuts
Driven end cable
bracket
Figure 15. Step 10.
Step 11: This step describes how to adjust types 31 and 33 cables.
Cable adjustments are made with the large bulkhead nuts only.
Smaller nuts on the rod ends should not be moved. Adjustments are
made with all breakers OPEN.
Ensure all bulkhead fittings still approximately centered on cable
mounting bracket, allowing for adjustment room in either direction.
Repeat Items 8 and 9 of Step 9 if any bulkhead fitting requires
centering.
Perform initial adjustments on driven (long rod) end of cable (refer to
Figure 15).
There should be little to no clearance between upper rod nut and face
of swivel on which it pulls (refer to Figure 16).
Too much clearance - adjust both bulkhead nuts to retract cable
housing.
No clearance or interference - advance cable housing in a similar
manner.
For additional adjustment length - bulkhead nuts on other end of
cable can be used.
Torque cable bulkhead nuts on both ends to 100 -120 in.-lbs
(11 - 13 N•m) when proper clearance is attained on driven end.
Upper nut
Swivel fitting
Threaded end
Long spacer tube

7
Instruction Leaet IL01301060E
Effective June 2016
Series NRX drawout and breaker
three-way cable interlock installation
and removal instructions
EATON www.eaton.com
Figure 16. Steps 10 and 11.
Step 12: This step describes how to adjust Type 32 cables. Cable
adjustments are made with the large bulkhead nuts only. Smaller nuts
on the rod ends should not be moved. Adjustments are made to the
connected breakers in various OPEN and CLOSED conditions. Refer to
Figures 17-20.
Ensure all bulkhead fittings are still approximately centered on the
cable mounting brackets, allowing for adjustment room in either
direction.
Repeat Items 8 and 9 of Step 9 if any bulkhead fittings requires
centering.
Perform initial adjustments on driven (long rod) end of cable (refer to
Figure 15). As adjustments are made with the connected breakers
in different states of OPEN and CLOSED, make certain that gaps
between the swivel fittings and the nuts are as indicated in the
applicable figure (Figures 17-20). In addition, the lever plate should
not rotate except when the connected breakers are CLOSED. In that
case, the lever plate will rotate approximately 60 degrees clockwise.
Torque cable bulkhead nuts on both ends to 100 - 120 in.-lbs
(11 - 13 N•m) when proper clearance is attained on driven end.
Figure 16. Step 12.
Lower nuts
Swivel fitting
Upper nut
Swivel fitting
Lever plate
Connected
breaker open
Gap ø
Figure 17. Step 12.
Figure 18. Step 12.
Figure 19. Step 12.
Connected
breaker closed
Connected
breaker open
Gap ø
Lever plate
Gap 2-4 mm
Gap ø
Lever plate
Connected breaker
closed
Gap 2-4 mm
Connected breaker
open
Lever plate
Connected
breaker closed

8
Series NRX drawout and breaker
three-way cable interlock installation
and removal instructions
EATON www.eaton.com
Instructional Leaet IL01301070E
Effective June 2016
Section 3: Functional test of interlock
assembly
Type 33 – Six-cable interlock assembly test. Refer to Table 1 for logic
details.
1. CHARGE and CLOSE Breaker A - Breakers B and C should be
held in OPEN condition. Charge Breakers B and C and attempt
to CLOSE them - they should not respond to the CLOSE attempt.
OPEN Breaker A - the interlock should release.
2. CLOSE Breaker B - verify it closes with the OPEN/CLOSED indicator.
Breakers A and C should be held in OPEN condition. Charge
Breakers A and C and attempt to CLOSE them - they should not
respond to the CLOSE attempt. OPEN Breaker B - the interlock
should release.
3. CLOSE Breaker C - verify it closes with the OPEN/CLOSED
indicator. Breakers A and B should be held in OPEN condition.
Charge Breakers A and B and attempt to CLOSE them - they
should not respond to the CLOSE attempt. OPEN Breaker C - the
interlock should release.
Type 31 – Four-cable interlock assembly test. Refer to Table 1 for logic
details.
1. CLOSE Breaker A. Attempt to CLOSE Breaker B - it should not
respond to the CLOSE attempt.
2. CLOSE Breaker C - verify Breaker A remains CLOSED. Again verify
Breaker B will not respond to CLOSE attempt.
3. OPEN Breaker A - verify Breaker B will not respond to CLOSE
attempt.
4. OPEN Breaker C - all breakers are now OPEN. CLOSE Breaker B -
verify Breakers A and C will not respond to CLOSE attempt.
Type 32 – Six-cable interlock assembly test. Refer to Table 2 for logic
details.
1. OPEN all breakers.
2. Charge and CLOSE Breaker A - Breakers B and C should not be
held OPEN - OPEN Breaker A.
3. Charge and CLOSE Breaker B - Breakers A and C should not be
held OPEN - OPEN Breaker B.
4. Charge and CLOSE Breaker C - Breakers A and B should not be
held OPEN - OPEN Breaker C.
5. Charge and CLOSE Breakers A and B - Breaker C should be held
OPEN - OPEN Breakers A and B.
6. Charge and CLOSE Breakers B and C - Breaker A should be held
OPEN - OPEN Breakers B and C.
7. Charge and CLOSE Breaker A and C - Breaker B should be held
OPEN - OPEN Breakers A and C.
The mechanical interlocks are now properly installed with the
successful completion of the appropriate tests. Utilize a light amount
of the supplied lubricant grease (G) if any interlock parts are sticky.
This is only recommended if needed.
Table 1. Types 33 and 31 logic.
A B C A B C
Type 33
(six cable)
Type 31
(four cable)
A B C A B C
0 0 0 0 0 0
1 0 0 1 0 0
0 1 0 1 0 1
0 0 1 0 0 1
0 1 0
Table 2. Types 32 logic.
Type 32 (six cable)
A B C
A B C
0 0 0
1 0 0
0 1 0
0 0 1
1 1 0
0 1 1
1 0 1

9
Instruction Leaet IL01301060E
Effective June 2016
Series NRX drawout and breaker
three-way cable interlock installation
and removal instructions
EATON www.eaton.com
Notes:

10
Series NRX drawout and breaker
three-way cable interlock installation
and removal instructions
EATON www.eaton.com
Instructional Leaet IL01301060E
Effective June 2016
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All Rights Reserved
Printed in USA
Publication No. IL01301060E/TBG001302
Part No. IL01301060EH05
June 2016
Disclaimer of warranties and limitation of
liability
The information, recommendations, descriptions, and safety
notations in this document are based on Eaton’s experience
and judgment, and may not cover all contingencies. If further
information is required, an Eaton sales office should be consulted.
Sale of the product shown in this literature is subject to the terms
and conditions outlined in appropriate Eaton selling policies or other
contractual agreement between Eaton and the purchaser.
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EXPRESSED OR IMPLIED, INCLUDING WARRANTIES OF FITNESS
FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, OTHER
THAN THOSE SPECIFICALLY SET OUT IN ANY EXISTING CONTRACT
BETWEEN THE PARTIES. ANY SUCH CONTRACT STATES THE ENTIRE
OBLIGATION OF EATON. THE CONTENTS OF THIS DOCUMENT
SHALL NOT BECOME PART OF OR MODIFY ANY CONTRACT
BETWEEN THE PARTIES.
In no event will Eaton be responsible to the purchaser or user in
contract, in tort (including negligence), strict liability, or otherwise
for any special, indirect, incidental, or consequential damage or loss
whatsoever, including but not limited to damage or loss of use of
equipment, plant or power system, cost of capital, loss of power,
additional expenses in the use of existing power facilities, or claims
against the purchaser or user by its customers resulting from the use
of the information, recommendations, and descriptions contained
herein.
The information contained in this manual is subject to change without
notice.