Hertz Make ‘CONVENTIONAL’ panels
High-grade welding machines and jigs contribute to giving excellent finish to its products making Hertz Switchboards very aesthetic. The welding facilities presently include MIG/CO2 welding and ARC welding machines.
Technical Data
| Conformance to standards | IEC 60439- 1&2 & IS 8623 |
| Short circuit withstand (Icw) - main bus | 50kA / 1sec / 105kA peak |
| Short circuit withstand (Icw) - neutral | 30kA / 1sec / 63kA peak |
| Short circuit withstand (Icw) - earth | 30kA / 1sec / 63kA peak |
| Degree of protection (IP) | IP 4X, 5X, X2, X5 |
| Ambient temperature | 40º C / 45º C / 50º C |
| Temperature rise | As per IEC 61439 -2:2011 |
| Rated insulation voltage | upto 1000V |
| Rated operational voltage | upto 690V |
| Main busbar rating | upto 3200A |
| Busbar execution | Interleaved / non-Interleaved |
| Busbar options | Copper / aluminium |
| lnfeed termination | Cable / bus ways / busduct |
| lnfeed entry | Top / bottom |
| Cable feeder access | Front / rear |
| ACB cubicle | Single tier |
| Form of seperation | upto form 4B |
| Standard height | As per Site Conditions |
| Standard depth | As Per Site Conditions |
| Sandard colour shade | RAL 7035 / RAL 7032 |
Salient features of the panels:
Use of non-hygroscopic SMC supports for Bus bar for adequate mechanical and electrical strength to withstand specified full current.
Panels are totally enclosed, dust proof and vermin proof, and fully compartmentalized, cubicle design and modular construction. The covers and doors are well gasket with neoprene rubber gaskets so as to obtain dust proof enclosure.
The panels are manufactured with separate Bus bar chamber isolated from Unit feeder chambers and Cable Alleys. This provides extra safety for working personnel.
The panels are made of 2/1.6mm thick CRCA / Special grade GI sheet steel for robust construction. The doors are provided with concealed hinges for better aesthetic appearances.
Technical Specifications
The Power and Motor Control Centers are metal clad totally enclosed dust and vermin proof modular construction, self supporting, floor mounting, air insulated cubicle type for use on 415 Volts 50 Cycles AC supply.
Construction
The Power and Motor Control Centers is fabricated using 2mm thick CRCA sheet steel. These are made of requisite vertical sections, which when coupled together shall from continuous dead front switch boards. The Power & Motor Control Centers are readily extensible on both sides by the addition of vertical sections after removal of the end covers and provide complete dust and damp protection, the degree of protection being not less than IP-52
The structure of the panel is mounted on the base frame of 3mm thick Sheet steel. The design shall ensure that weight of the components is adequately supported.
Bus bars
The bus bar is air insulated and made of high conductivity, high strength E.C. grade copper or aluminium alloy complying with the requirements of Grade E91E of IS: 5082, as required
The bus bar is suitably braced with non-hygroscopic SMC supports at suitable intervals in order to withstand the dynamic forces of Short Circuit at 50KA RMS, symmetrical for 1 sec. large clearances and creepage distances are provided on the bus bar system to minimize the possibility of a fault as per the relevant Indian Standard.
The main bus bar shall have continuous current rating throughout the length of each Power / Motor Control Centre and the neutral bus bar shall have a continuous rating of at least 50% of the phase bus bars.
Surface Treatment
All steel work used in the construction of Bus duct are thoroughly cleaned to remove all rust, scales, grease and other foreign matters. This is done by treating the sheet steel through the seven tank Process that involves de-greasing, de-rusting, activation, Phosphating, scaling and drying as per the IS:3618
The sheet steel structure is then powder coated with epoxy based powder with specified shade as per national / International standards.
Surface Treatment
Cable entries and terminals are provided in the switchboard to suit the number, type and size of Aluminium conductor power cables and copper conductor control cables. Provision will be made for Top or Bottom entry of cables as required. Generous size of cabling chambers are provided with the position of cable glands and terminals such that cables can be easily and safely terminated.
All control wiring is carried out with stranded copper conductor of 1.5 sq. mm for Control and Potential circuits. 2.5 sq.mm wires are used for CTs and current circuits.
Wiring shall be neatly bunched and provided in the PVC troughs with a cover. Adequate support is provided and properly routed to allow for easy access and maintenance. Wires are identified by ferrules at each end.
Tests
Following routine inspection and tests are conducted on the Power / Motor Control Centre in accordance with IS/IEC 61439 / 60439.
- Inspection of the Power / Motor Control Centre including inspection of wiring and electrical operational tests, where ever necessary.
- Dielectric Tests at High Voltage.
- Insulation Test at 1000 Volts.
- Checking of Protective Measures and electrical continuity of the protective circuits.
Applicable Standards:
Switchboards are designed to conform to the requirements of the following Standards:
⇒ IS/IEC 61439 / 60439- Factory Built Assemblies of Switchgear and Control gear.
⇒ IS 375 - Marking and Arrangement for Switchgear Bus bar etc.
⇒ IS 4237 - General requirements for Switch gear & Control gear.
⇒ IS 2147 - Degree of Protection provided by enclosure for Low Voltage Switch gear & Control gear.
⇒ IS 2516 - Air Circuit Breakers of voltages not exceeding 1000V AC
⇒ IS 4064 - Fuse Switch and Switch Fuse units for voltage not Exceeding 1000V AC
