EATON IL0131079EN Installation and Removal Instructions for Series NRX NF Fixed Breaker three way Cable Interlock Kit Instruction Manual

IL0131079EN Installation and Removal Instructions for Series NRX
NF Fixed Breaker three way Cable Interlock Kit
Instruction Manual Instructions apply to:
Series NRXT, Type NF frame, ANSI,
ULT 1066, UL 489 / IEC, IZMX16, IZM91

IL0131079EN Installation and Removal Instructions for Series NRX NF Fixed

Breaker three way Cable Interlock Kit

WARNING

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 POSITIONAND MECHANISM SPRINGS DISCHARGED.
   FAILURE TO FOLLOW THESE WARNINGS FOR ALL PROCEDURES DESCRIBED IN THIS INSTRUCTION LEAFLET COULD RESULT IN DEATH, BODILY INJURY, OR PROPERTY DAMAGE.

WARNING
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.

General information

This information leaflet (IL) provides detailed installation instructions for installing and interconnecting one fixed Type NF frame breaker to another type of low voltage  circuit breaker (LVCB) in any position (see A, B, C in Table

1. for a Type 31 or Type 33 interlock configuration as shown in Figure 1 . When purchasing kits for a Type 31 or  Type 33 interlock configuration setup, additional interlock kits (the types of interlock kits and the other breakers on which they can be installed that are compatible with this  kit are listed in Table 2) are required for the other two breakers as well as the interconnecting cable kits (two or three are required depending on whether a Type 31 or Type 33  interlock configuration is desired, respectively) .
   For Type 31 or Type 33 interlock configurations, the mechanical interlock holds one or more of the breakers tripped or open (prevents closure) when some combination of  the others are closed . A lever assembly is mounted on each breaker and interfaces with the pole shaft and trip bar . The lever assemblies are interconnected with cables  provided in interconnecting cable kits (listed in Table 3) that are compatible with this interlock kit . The cable kits, purchased separately, each contain two cables and can be  used for any orientation of the breakers according to the installation recommendations in Step 9.
   Refer to Figure 2 and Figure 3 for identification of interlock kit and interconnecting cable kit contents, respectively.

Allowed states or conditions
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

0 = open
1 = closed

Table 2. Interlock assembly kits for interconnected breakers

Interconnected breaker| Interlock assembly kit for fixed breaker| Interlock assembly kit for drawout breaker
---|---|---
NRX Type NF frame| IZMX-MIL3133C-F16-2| IZMX-MIL3133C-W16-2
NRX Type RF frame| IZMX-MIL3133C-F40-2| IZMX-MIL3133C-W40-2
Magnum DST, SB or IZM| MCI2W3W3133FX| MCI2W3W3133DO

Table 3. Interconnecting cable kits (two cables per kit) 1

1 Cable kits are purchased separately as needed.

Installation

Required tools

• 10 mm hex socket
• 11/16-inch open-end wrench
• 3/8-inch open-end wrench
• 3/8-inch hex socket
•  2 mm Allen wrench
• Drive extension
• Adjustable wrench
• Ratchet
• T15 Torx driver
•  Measuring instrument, in mm
  Before proceeding with the following steps, ensure that all breakers are in the OPEN and DISCHARGED position: otee:N Refer to Figure 2 and Figure 3 for parts identification .

Step 1
Remove the four screws holding the front cover in place (two on each side of the cover) as shown in Figure 4 .

Step 2
Remove the front cover as shown in Figure 5 . Pull down on the charging handle to simplify removal .

Figure 5. Details for Step 2
Step 3
Install the mounting feet . Refer to IL01301030E for detailed instructions .
Step 4
Install the drive arm (D) to the end of the pole shaft using one M3 x 8 mm flathead screw (C) as shown in Figure 6 and Figure 7 . Apply LoctiteT Blue 242 to ensure that the  screw cannot loosen during operation . The drive arm should be oriented as shown in Figure 6 and Figure 7 . Torque to 0,3–0,6 N∙m (3–5 in-lb) .
Step 5
Install the trip pin (F) to the trip bar using an M3 x 8 mm flathead screw (C) while holding the trip bar with an adjustable wrench as shown in Figure 6 and Figure 7 . Apply  Loctite Blue 242 to ensure that the screw cannot loosen during operation . Torque to 0,3–0,6 N∙m (3–5 in-lb) .

Step 6
Fasten interlock assembly (E) to interlock mounting plate (K) using three M6 x 12 mm hex bolts (A) and lock washers (B) as shown in Figure 8 . Torque to 4,5–5,6 N∙m (40– 50 in-lb) . Then fasten interlock mounting plate (K) with attached interlock assembly to the right side of the breaker using three M5 x 12 mm screws (M) and one M5 square  nut (L) as shown in Figure 8 . Torque to 7,3–9,6 N∙m (65–85 in-lb) . Ensure that once attached to the breaker, the interlock assembly trip paddle is above the trip pin on the  trip bar as shown in Figure 9 .

Step 7
Fasten four cable brackets (H) to interlock mounting plate (K) just below interlock assembly mounted in Step 6 using two M6 x 10 mm thread-forming screws (I) as shown in Figure 10 .
Torque to 7,3–9,6 N∙m (65–85 in-lb) .

Step 8
Replace the front cover and secure it in place with the four mounting screws previously removed in Step 1 .
Step 9
This step contains cable routing and installation procedures. Verify that cables move freely in their cable housings before installation. When attaching cables to swivel  fittings, ensure that both ends of the cable are connected to push swivel fittings or both ends are connected to pull swivel fittings (refer to Figure 10) . For example, a cable  connected to the drive lever pull swivel fitting on Breaker A must connect to the driven level pull swivel fitting on Breaker B .

ATTENTION
FIGURE 11 SHOWS THE TYPICAL CABLE ROUTING FOR TYPE 31 AND 33 INTERLOCK CONFIGURATIONS. NOTICE THAT, DEPENDING ON THE  POSITION OF THE BREAKER WITHIN THE INTERLOCK CONFIGURATION, THE CABLES WILL BE ATTACHED IN DIFFERENT LOCATIONS. THE  CABLE MOUNTING ON BOTH POINTS OF THE DRIVE AND DRIVEN LEVERS ARE DESCRIBED BELOW. TABLE 4 SHOWS THE TYPE 31 AND TYPE  33 INTERLOCK LOGIC DEPENDING ON POSITION.

Allowed states or conditions
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

Installation recommendations

• 102 mm (4 in) minimum allowable cable housing bend radius
• Use plastic wire ties / clamps to attach cable housing to structure after installation and adjustment
• Do not compress the cable housing
• Recheck to ensure cables move freely

Step 10
This step describes how to first attach the drive (short rod) end of a cable to its interlock assembly and cable bracket (see Figure 13) . To attach the drive (short rod) end of a  cable to the drive lever pull swivel fitting (refer to Figure 12), follow the directions below .

1. Remove upper nut, compression spring, and 38,1 mm (1,5 in) tube spacer from the end of rod of cable assembly.
2. Slide the rubber boot toward tip of the rod.
3. Unthread the outer bulkhead nut and slide nut and lock washer toward the tip.
4. Insert the threaded end of rod into the swivel fitting.
5. Slide the smaller diameter portion of bulkhead fitting into the cable bracket slot, keeping one of the two lock washers with each bulkhead nut .
6. Raise the cable assembly until the threaded portion of bulkhead fitting enters the slotted hole in the cable bracket (threads show above bracket) .
7. Bring the bulkhead washer and nut down to the threads and hand tighten.
8. Adjust the two bulkhead nuts to approximately center the threaded section of the bulkhead fitting on the cable mounting bracket.
9. Hand tighten the bulkhead nuts at this time.
10. Slide the rubber boot back into place over the end of bulkhead fitting.
11. Replace the 38,1 mm (1,5 in) tube spacer, compression spring, and upper nut on end of rod.
12. The lower nuts should be against the stop at the end of the thread and upper nut tightened against the tube spacer.
13. Hold the lower nuts and torque upper nut to 3,3–4,5 N∙m (30–40 in-lb).

To attach the drive (short rod) end of a cable to the drive lever push swivel fitting (refer to Figure 12), follow the directions below (see Figure 13) .

1. Remove the upper nut from the end of the rod of the cable assembly.
2. Slide the rubber boot toward the tip of rod.
3. Unthread the outer bulkhead nut and slide the nut and lock washer toward tip.
4. Insert the threaded end of the rod with the 38,1 mm (1,5 in) tube spacer into the swivel fitting ensuring that the compression spring remains between the lower nuts and the swivel.
5. Slide the smaller diameter portion of the bulkhead fitting into the cable bracket slot, keeping one of the two lock washers with each bulkhead nut.
6. Raise the cable assembly until the threaded portion of the bulkhead fitting enters the slotted hole in the cable bracket (threads show above bracket).
7. Bring the bulkhead washer and nut down to the threads and hand tighten .
8. Adjust the two bulkhead nuts to approximately the center of the threaded section of the bulkhead fitting on the cable mounting bracket.
9. Hand tighten the bulkhead nuts at this time.
10. Slide the rubber boot back into place over the end of bulkhead fitting.
11. The lower nuts should be against the stop at the end of thread and upper nut tightened against tube spacer.
12. Hold the lower nuts and torque the upper nut to 3,3–4,5 N∙m (30–40 in-lb).

Step 11
This step describes how to attach the driven (long rod) end of a cable attached to an interlock assembly on another breaker to the cable bracket and interlock assembly on this Type NF frame breaker.
Refer to Figure 11 and Figure 12 for cable routing and correct swivel fittings to which the cables are connected.
The driven (long rod) end of the cable is attached to the corresponding push or pull swivel fitting on the driven lever on this cable interlock assembly similarly to Step 10  except the driven end does not utilize a compression spring between the swivel and nut . Ensure that the 22 .2 mm cable tube spacer (M) is used on the rod end of the cable  assembly through both push and pull swivel fittings as shown in Figure 14 . If a drawout or fixed Type RF frame breaker is being connected to the driven lever push swivel  fitting on this breaker, the 6 .3 mm cable tube spacer (J) must be installed over top of the 22 .2 mm cable tube spacer (M) between the lower nuts and the driven lever push swivel fitting as shown in Figure 14.

Step 12
This step describes how to adjust the cables to ensure proper functionality of the cable interlock setup . Cable adjustments are made with the large bulkhead nuts ONLY and  with all breakers OPEN . Nuts on the rod ends should not be moved.
Begin by adjusting or verifying that the threaded section of all bulkhead fittings are approximately centered on the cable mounting brackets, allowing for room to adjust in  either direction . Hand tighten the nuts at this time.
Perform initial adjustments on the driven (long rod) end of cable.
There should be a small clearance (see Table 5) between the upper nut and the face of the pull swivel on which it pulls (see Figure 14).
If there is too much clearance, adjust both the bulkhead nuts to retract the cable housing (move threaded portion down).
If there is no clearance, advance the cable housing in the same manner (move threaded portion up).
If additional adjustment length is needed, the bulkhead nuts on the other (drive) end of cable can be used.
When the proper clearance is attained on the driven end, torque both cable bulkhead nuts to 11–13 N∙m (100–120 in-lb) without moving the bulkhead fittings.
After the driven end has been adjusted and the bulkhead nuts have been tightened, perform adjustments on the drive (short rod) end of the cable . Adjust the bulkhead nuts  up (move threaded portion down) such that the gap between the drive lever and the interlock assembly base shown on Figure 12 is less than 4,5 mm (0,18 in).
When the gap is less than 4,5 mm, torque the cable bulkhead nuts on both ends to 11–13 N∙m (100–120 in-lb).

Table 5. Driven lever cable rod clearances

Driving breaker| Driven NF push clearance| Driven NF pull clearance
---|---|---
Type NF frame| < 1,6 mm (0,06 in)| < 1,6 mm (0,06 in)
Type RF frame| < 14,3 mm (0,56 in)| < 14,3 mm (0,56 in)
Magnum| < 11,1 mm (0,44 in)| < 14,3 mm (0,56 in)

Functional test of interlock assembly

Refer to Table 1 and Figure 1 for breaker position in the interlock configuration . Begin the test sequence with all breakers OPEN. For Breaker A, verify that the interlock  assembly is positioned as shown in Figure 15 while in the various states required by the steps below.
For Breakers B and C, use the figure included in the information leaflet for the interlock kit installed on those breakers.
Type 31
Four-cable interlock assembly test . Refer to Table 1 for logic details.

• CHARGE and CLOSE Breaker A

• CHARGE and attempt to CLOSE Breaker B . It should not respond to CLOSE attempt (no noise, spring discharge, or contact motion)

• CHARGE and CLOSE Breaker C . Verify that Breaker A remains CLOSED

• CHARGE and attempt to CLOSE Breaker B again . It should still not respond to CLOSE attempt (no noise, spring discharge, or contact motion)

• OPEN Breaker A . Verify that Breaker C is still CLOSED . CHARGE and attempt to CLOSE Breaker B . It should still not respond to CLOSE attempt (no noise,  spring discharge, or contact motion)

• OPEN Breaker C . All breakers should now be OPEN

• CHARGE and CLOSE Breaker B . CHARGE and attempt to CLOSE Breakers A and C . Verify that they do not respond to CLOSE attempt (no noise, spring  discharge, or contact motion) Type 33
  Six-cable interlock assembly test . Refer to Table 1 for logic details .

• CHARGE and CLOSE Breaker A

• CHARGE and attempt to CLOSE Breakers B and C . Verify that neither breaker responds to the CLOSE attempt (no noise, spring discharge, or contact motion)

• OPEN Breaker A . The interlock should release

• Repeat above test on Breaker B using B for A, C for B, and A for C and Breaker C using C for A, A for B, and B for C The mechanical interlock is now properly installed  and adjusted .
  Use a light amount of supplied lubricant (G) if any interlock parts are sticky or do not fully reset . This is only recommended if needed .

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.
THERE ARE NO UNDERSTANDINGS, AGREEMENTS, WARRANTIES, 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  description contained herein.
The information contained in this manual is subject to change without notice.

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Publication No . IL0131079EN / Z16557
Part Number: IL0131079ENH02
April 2015
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