Download kva busbar trunking spec

Technical specification for tender
Medium Power Busbar Trunking System
Specifications
Transport and Rising Mains applications from 200A to 800A
Last update :15-05-17
841020213
Technical specification for tender
841020213
Table of contents:
1.
GENERAL................................................................................................................................................................................. 3
2.
CONFORMITY TO STANDARD .......................................................................................................................................... 3
3.
ENVIRONMENT ..................................................................................................................................................................... 3
4.
CONDUCTORS ........................................................................................................................................................................ 3
5.
PROTECTIVE CONDUCTOR ............................................................................................................................................... 3
6.
SHORT CIRCUIT CAPACITY .............................................................................................................................................. 4
7.
TEMPERATURE RISE ........................................................................................................................................................... 4
8.
EXPANSION JOINT ................................................................................................................................................................ 4
9.
JOINTS ...................................................................................................................................................................................... 4
10. ENCLOSURE ........................................................................................................................................................................... 4
11. TAP-OFF UNITS FOR RISERS ............................................................................................................................................. 4
Last update :15-05-17
Technical specification for tender
1.
841020213
General
The busbar trunking system shall be of low impedance and sandwiched typed technology. It shall be totally enclosed
prelacquered galvanized steel sheet with aluminium conductors; suitable for a 3 phase 4 wire 415 volts system with
full neutral and continuous internal copper earth bar of half size similar to the Telemecanique Canalis range.
The system shall be complete with all necessary fittings, tap-off unit brackets, etc. All busbar trunking fittings (elbow,
tees, end Cable Tap Box, etc.) shall be IP52 in accordance to IEC 529 and from the same manufacturer as the busbar
trunking system.
The busbar trunking system shall be capable of being mounted in any position without derating. Feeder sections shall
be interchangeable without the use of special adapter joint covers. The complete installation shall be coordinated
throughout and where possible, shall consist of standard 4m sections with special sections and fittings provided to suit
the installation.
Horizontal runs of busbar trunking system shall be supported by hangers at every 3 meters. Vertical runs of busbar
trunking system shall be supported by hangers not more than 4m apart.
Busbar trunking system shall be terminated by ‘end closure’.
2.
Conformity To Standard
It shall be constructed in accordance with the applicable requirements of the latest IEC 439 Part 1 and Part 2.
Conservation of the integrity of electrical circuits under fire condition and verification of fire barrier in accordance of
the latest ISO 1182.and ISO 834
Resistance to flame propagation conforming IEC 60332 Part 3.
Resistance of the materials to abnormal heat conforming IEC 60695 Part 2.
3.
Environment
The busbar trunking system shall be suitable for continuous operation without derating at an average ambient
temperature of 35o C for 24h (40°C maximum).
4.
Conductors
Conductors shall be of hard drawn 99% purity Aluminium EAlMgSi according EN 573-3 and ENAW-6101 standards.
Aluminium live conductors shall be insulated by 4 layers of class “B” 130°C halogen free polyester.
Full size neutral of the same cross-sectional area as the phase conductor shall be provided for all ratings of the busbar
trunking system. The busbar trunking system shall have the following characteristics:
Paint Finish
Rated Insulation Voltage (A/C)
Rated Operating Voltage (A/C)
Frequency
5.
:
:
:
:
RAL 7032
1000 Volts
1000 Volts
50/60Hz
Protective Conductor
Integral continuous internal copper conductor of cross-section area equal to 50% that of the corresponding phase
conductor shall be provided.
Last update :15-05-17
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Technical specification for tender
6.
841020213
Short Circuit Capacity
The whole busbar trunking system shall be capable of withstanding the short circuit capacity of the electrical
installation without damaging the electrical, mechanical and thermal stress under fault condition at a service voltage of
415V 50Hz.
Co-ordination of the distribution should be guarenteed such that the Circuit breaker / trunking combination will limit
the peak current to a value less than the rated peak current of the busbar trunking.
7.
Temperature Rise
The maximum hot-spot temperature rise at any point in the busbar at continuous rated load shall not exceed 55o C
above the maximum ambient temperature of 35o C in any position.
8.
Expansion Joint
Busbar expansion units shall be use in cases recommended by the vendor to reduce the stress on the system by
differential expansion between the busbars and the casing, particularly for long run of the busbar.
9.
Joints
All busbar joints shall of be silver plated copper.
The electrical joints shall be of one bolt type designed for even distribution of contact pressure and with inspection
covers provided on each side of the joint and can be dismantled to facilitate removal or extension.
It shall be possible to make up a joint from one side in the event that the busbar trunking system is installed against a
wall or ceiling. The joints shall be so designed as to allow removal of any length without disturbing adjacent lengths.
Belleville spring shall be provided to give positive pressure over complete contact wear. The tightening torque shall be
3 Nm, and the bolt shall include an external breakable head which breaks when the correct torque is reach.
10.
Enclosure
The metal enclosure of the busbar trunking system shall be of 1 mm thick hot dip galvanized sheet steel to provide
high protection and mechanical resistance for the phase conductors along the entire length.
Resistance to corrosion shall meet the following test :
Tropical test
: 1000 hours
Salted Marine Fog
: 360 hours
Both vertical and horizontal runs of busbar trunking system shall be of degree of protection to IP 52. The enclosure
shall be made of four steel sections assembled by clinching.
In order to limit magnetic field around the busbar system, aluminium enclosures are not acceptable.
11.
Tap-off units for Risers
Tap-off units shall be from the same manufacturer as the busbar trunking system and shall be provided with off-load
isolator suitable for fuses or circuit breakers according to ratings as indicated in the drawings.
All circuit breakers used shall be able to operate normally when mounted upside down or at any angles. The tap-off
units shall also have the provision to mount the earth fault relay together with the breaker. Tap-off units shall be of
dust and damp proof version, degree of protection IP 54 and shall be suitably earthed.
The tap off unit shall be bolted at the joints between two elements, and shall be designed to accept one MCCB.
Last update :15-05-17
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Technical specification for tender
841020213
The MCCB used in the tap-off unit must comply with IEC 947-2. All MCCBs shall have a rated service breaking
capacity(Ics) of RMS value at 415VAC equal or higher than the prospective fault level of installation. It shall have
current limiting capabilities to protect the busbar trunking system and co-ordination table shall be furnished by
manufacturer.
The tap-off unit shall have an interlock which prevents the cover from being opened while the device is in the ‘ON’
position and to prevent accidental closing of the device when the cover is opened.
Last update :15-05-17
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