EATON IL0131123EN NRX Type NF Bus Extension Kit Instruction Manual
- June 3, 2024
- EATON
Table of Contents
EATON IL0131123EN NRX Type NF Bus Extension Kit Instruction Manual
⚠ WARNING
- ONLY QUALIFIED ELECTRICAL PERSONNEL SHOULD BE PERMITTED TO WORK ON THE EQUIPMENT.
- ALWAYS DE-ENERGIZE PRIMARY AND SECONDARY CIRCUITS IF A CIRCUIT BREAKER CANNOT BE REMOVED TO A SAFE WORK LOCATION.
- DRAWOUT CIRCUIT BREAKERS SHOULD BE LEVERED (RACKED) OUT TO THE DISCONNECT POSITION.
- 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.
⚠ 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
EQUIPMENT.
General information
This Series NRX 65 kA bus extension kit is for a fixed front connect configuration (Figure 1). The arc hood on a Series NRX fixed circuit breaker is positioned over the breaker’s arc chambers to primarily direct arc gas discharge. An arc hood is used on all fixed circuit breakers whether they are configured for rear or front connection. This front connect configuration also contains a shroud mounted on the load side of the breaker. Mounting feet are used to attach breakers to a vertical surface. Refer to IL01301020E for mounting instructions.
⚠ CAUTION
IT IS IMPORTANT NOT TO EXCEED THE RECOMMENDED TORQUE VALUES WHEN MAKING BOLTED
CONNECTIONS TO THE EQUIPMENT OR TO THE ADAPTERS THEMSELVES, ALL WHICH HAVE
PRE-TAPPED HOLES. FAILURE TO FOLLOW THESE REQUIREMENTS COULD RESULT IN
EQUIPMENT DAMAGE AND/OR FAILURE.
The front connect breaker configuration has bus adapters that are internal to the breaker and are intended to accommodate cable terminals and/or bus extension connections. These cannot be replaced in the field.
The arc hood on the line side and the shroud on the load side serve to insulate the bus adapters from their surroundings (Figure 2). Refer to Table 1 for a list of available front connectors.
Note: For applications of 65 kA, the bus extension kits below must be utilized for the line side only.
Instructions to assemble
Bus extension kit installation
In order to attach cable terminals or bus conductor extensions to the line and
load bus adapters, proceed with the following steps.
Step 1
Remove the four screws (or five screws for a four-pole breaker) while holding
the front of the arc hood (Figure 3).
Step 2
With the screws removed, pull out the front of the arc hood and set it aside
(Figure 4).
Step 3
Slide each of the baffles forward and out to provide proper access to the bus
adapters (Figure 5).
Step 4
Remove four screws and lift up front cover. On the line side, remove the three
screws on the secondary contact block assembly. Slide out secondary contact
block shield. With the screws removed, pull out the secondary contact block
assembly (Figure 6).
Step 5
Access is now available to make the required bus conductor extension or cable
terminal connections (Figure 7).
Step 6
Bolt the bus conductor extensions to the breaker bus adapters using the
provided hardware. Torque the bolted connections to 30 ft-lb (40.7 NM). Make
sure that the hardware used to make the connections does not extend out past
the adapter surface. Check that the bolt goes all the way through the bus
adapters.
- Attach back plate on extender support to join all 3 extenders as shown in Figure 8.
- Once the bolted connections are made, replace the baffles removed in Step 3 by sliding them back into position, making sure that the baffle notches are oriented toward the breaker. The bus extensions will fit through the space available between the baffles and the arc hood. Replace secondary block assembly shield.
- Replace the secondary contact block assembly previously removed in Step 4.
- Replace front of the arc hood and the front of the shroud previously removed in Step 1 and Step 2. Replace front cover.
- Phase barriers made from flexible rubber material are supplied with the bus extension kit, along with the cable terminals. The phase barriers should be installed to the right and left of the center bus connector extension on both the line and the load sides. These phase barriers provide proper insulation integrity.
- Remove and replace side sheets with side sheets included in this kit with hardware.
⚠ CAUTION
MAKE SURE THE PHASE BARRIERS FROM STEP 6.5 ARE PROPERLY INSTALLED BEFORE
PLACING THE CIRCUIT BREAKER INTO SERVICE. FAILURE TO FOLLOW THESE REQUIREMENTS
COULD RESULT IN EQUIPMENT DAMAGE AND/OR FAILURE.
If only using bus conductor extension kit, skip Step 7.
Cable terminal kit installation
Note: Step 1 through Step 4 need to be completed before proceeding with Step
7.
Step 7
Cable terminal now can be installed to the bus conductor extensions that
extend out of the line side of the breaker. Cable terminals are described in
Table 2. To complete the connections, proceed with the following steps.
- Bolt the cable terminals directly to the extenders using the hardware provided. Cable terminals can also be bolted to the bus connector extensions (Figure 13). Torque the bolted connections to 30 ft-lb (27 N∙m).
Note: Terminals are not included in kit, but hardware to attach them is included.
- When making the cable terminal connections, properly torque the cable retaining screws and periodically check all mounting hardware for proper torque loading. Refer to Figure 15 for rope lacing support instructions. To remove the cable terminals, reverse the procedure described above.
- When making the cable terminal connections, properly torque the cable retaining screws and periodically check all mounting hardware for proper torque loading. Refer to Figure 15 for rope lacing support instructions.
To remove the cable terminals, reverse the procedure described above.
- When making the cable terminal connections, properly torque the cable retaining screws and periodically check all mounting hardware for proper torque loading. Refer to Figure 15 for rope lacing support instructions. To remove the cable terminals, reverse the procedure described above.
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. IL0131123EN / Z17828
Part Number: IL0131123ENH01
February 2016
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