OEM Waterproof Electric Control Box Metal Enclosures Cabinets Outdoor In order to ensure that electrical equipment supplied to USER conforms to DESAN's standards, required to meet the following requirements.
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2 STANDARD SPECIFICATION AND LOCAL REGULATIONS
2.1 Equipment Standards
All materials and work shall comply with, and all equipment shall be designed, manufactured and tested, in accordance with the relevant Australian Standard Specifications or Codes of Practice, together with any amendments or other Regulations required by the Federal, State or Local Authorities. Electric Control Box :Applicable standards include but are not limited to
| AS1359 | Rotating Electrical Machines |
| AS/NZS 2344 | Limits of electromagnetic interference |
| AS2374 | Power Transformers |
| AS 2381 | Electrical equipment for explosive atmospheres |
| AS/NZS 3000 | SAA Wiring Rules |
| AS/NZS 3008 | Electrical installations - Selection of cables |
| AS 4024 | Safe Guarding of Machinery |
| AS 60038 | Standard voltages |
| AS/NZS 60079 | Electrical apparatus for explosive gas atmospheres |
| AS 60204.1 | Safety of machinery - Electrical equipment of machines - General requirements |
| AS 60204.11 | Safety of machinery - Electrical equipment of machines - Requirements for HV equipment for voltages above 1000 V a.c. or 1500 V d.c and not exceeding 36 kV |
| AS/NZS 61000.3.6 | Electromagnetic compatibility (EMC) Limits - Assessment of emission limits for distorting loads in MV and HV power systems |
| AS/NZS 61000.3.7 | Electromagnetic compatibility (EMC) Limits - Assessment of emission limits for fluctuation loads in MV and HV power systems |
| AS 61508 | Functional safety of electrical/electronic/programmable electronic safety-related systems |
| AS 61800 | Adjustable speed electrical power drive systems |
| AS 62061 | Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems |
| Western Power Corporation Technical Rules |
2.2 Supply System
Electric Control Box ,its Standard Power Supply System shall be 400V, 3 phase and neutral plus earth, 50 hertz and 230 volts, single phase and neutral plus earth, 50 hertz as per AS60038-2000. Unless otherwise specified in project documentation all LV equipment supplied will be suitable for connection to this voltage. High voltage supply levels shall be approved in writing by Bradken prior to Supplier committing equipment.
2.3 Enclosures
All enclosures shall be industrial dustproof, fully protected indoor/outdoor, weatherproof, tropicproof, flameproof, or increased safety etc. as required by the particular hazardous area classification into which the equipment is to be installed.
Indoor enclosures situated in Control Rooms shall have a minimum degree of protection IP54. Enclosures located outdoor or in plant areas shall have a minimum degree of protection IP56.
2.4 Control Voltages
The preferred Control Voltage shall be 24V DC.
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- Circuits shall be fail safe i.e. de-energised to trip.
- Alarm initiating contacts shall be normally closed and energised open under 'non' alarm conditions.
- Indication lamps shall be extra low voltage High intensity LED
- Preferred Current Transformer secondary rated current shall be 1 amp except for specialised applications requiring other values.
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3 SWITCHBOARDS AND DISTRIBUTION BOARDS
In general, Electric Control Box switchboards and distribution boards are to be provided in accordance with relevant sections of AS 60204- Safety of machinery - Electrical equipment of machines, except where the following requirements are more stringent.
3.1 Switchboards
All switchboards shall be free standing, metal clad, dust proof enclosures with front access only. LV switchboards to be of Form 3b condtuction - segregation of busbars, incomer unit and functional units.
Main switchboards shall be fitted with a suitably rated incoming circuit breaker fitted with electronic overload and earth leakage protection. Undervoltage trip shall also be included if warranted by load types.
A single voltmeter switched between phases and phase to neutral together with three ammeters fitted with maximum demand indicators plus a power factor and kilowatt hour meter shall be fitted to all main switchboards. Alternatively a single digital meter providing these functions such as an Allen Bradley Powermonitor is acceptable. A lockable hinged panel shall be provided for the mounting of the above instruments. Where applicable a C/T chamber to comply with the local supply authorities requirements shall be provided.
Nilsen or GEC combined fuse switch units shall be used for all subcircuit supplies as a minimum. Suitably fault-rated moulded case circuit breakers are acceptable where more procise protection is required.
A spacious outgoing cable compartment fitted with a neutral bar with adequate take offs and earth bar shall be provided.
3.2 Distribution Boards
3.2.1 All distribution boards shall be metal clad and suitable either for wall mounting or floor mounting depending on size. Wall mounted panels shall be positioned such that the top of the panel is 2 metres above floor level. Boards shall have a lockable handle. Boards shall be fitted with hinged internal escutcheon with fixing tool access.
3.2.2 Top entries shall not be made to outdoor distribution boards, and where possible, all entries shall be from below.
3.2.3 Each board shall be labelled with the appropriate board designation as per single line diagram.
3.2.4 Distribution boards shall be fitted with circuit breakers of relevant fault level. Where miniature circuit breakers are installed they shall be equal to SAFE-T or better. Individual circuit breakers are to be lockable in the off position.
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- Each board shall be complete with a suitably rated isolating switch, together with the required number of ways plus 20% spare spaces. Isolating switches to be interlocked to the escutcheon so as to allow the escutcheon to be opened only in the "Off" position or by use of a tool. Isolating switch to be lockable in the off position.
- Opening of door shall not expose live parts.
- All busbars shall be P.V.C. coated in appropriate phase colours, black for neutral. The neutral bar shall be insulated from earth.
- All single phase GPO circuits shall be protected by means of a core-balance earth leakage circuit breaker.
- All distribution boards shall be fitted with a maximum demand indication ammeter fitted to B Phase.
- Each board shall be provided with a fully documented, non-deteriorating legend, mounted inside the door.
- No earth - neutral connections shall be made at distribution boards.
- Doors and escutcheons, fitted with instruments and electrical devices, shall be connected to the main case or cubicle with a 4mm2 minimum sized flexible earthing bond conductor.
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3.3 Motor Starter Panels
Where a group of motors are part of a single machine or plant the motor starters shall be enclosed in a single motor control centre. The MCC is to be of Form 3b segregation.
if Electric Control Box , Motors rated below 30KW shall in general be started DOL. 30KW and above the motor starters will be selected to suit the particular application.
4 CONTROL PANELS
In general, control panels are to be provided in accordance with relevant sections of AS 60204- Safety of machinery - Electrical equipment of machines, except where the following requirements are more stringent.
4.1 General - Main Control Panels
All control panels shall be metal clad and suitable either for wall mounting or floor mounting depending on size. Wall mounted panels shall be positioned such that the top of the panel is 2 metres above floor level. Boards shall have a lockable handle.. Where items such as instruments, meters, push buttons, selector switches, etc. are fitted to the panel or door, the dustproof and/or weatherproof quality shall be maintained.
Doors and escutcheons, fitted with instruments and electrical devices, shall be connected to the main case or cubicle with a 4mm2 minimum sized flexible earthing bond conductor.
4.2 General - Small Control Panels
Requirements as for 4.1. Small control panels such as field mounted selector/control stations, junction boxes and lighting fitting control boxes need not be fitted with a lock. However, access shall be gained only by a person going through a positive deliberate action such as removing screws or nuts and bolts, etc. All operator controls and indication shall be mounted on the front panel. Access doors and panels larger than 0.1 metre square shall be hinged.
4.3 Pushbutton Stations
4.3.1 In general, motors shall be provided with the means of starting and stopping, both from a control station located adjacent to the motor and from a remote control panel where applicable. The Supplier shall state any additional and/or alternative control which may be required from other positions.
4.3.2 A local control station, equipped with: start and stop buttons; a local/remote mode selection switch;, shall be mounted adjacent to the motor. Refer to section 5.4.2 for motor isolators.
4.3.3 Motor emergency stop pushbuttons shall be latching type. The "normally closed" contacts shall be wired in series with the motor contactor coil.
4.3.4 A second set of contacts shall be provided for indication of latched emergency stops.
4.4 Indication Lamps
Lens colour shall be -:
- Red "MAJOR ALARM" or "DANGER"
- Green "ON" or "RUN"
- Blue "AUTOMATIC SEQUENCE"
- Amber "MINOR FAULT"
- White Other Conditions "PLANT READY" etc.
4.5 Push Buttons
Button colours shall be:
- Green "Start", "Close" or "On"
- Red "Emergency Stop", "Trip" or "Off"
- Black "Reset", "Normal Stop" or other conditions
4.6 Meters
Where meters are required, the minimum size meter shall be 96mm squared. Meters shall be scaled such that maximum operating position is within 75-80% of Full Scale. All ammeters shall be calibrated for a minimum of five times over scale with a withstand of eight times over scale.
Meters should be easily readable from a standing position and should be mounted between 1.5 and 1.8 metres above ground when mounted on a vertical surface.
Meters mounted on a control desk should be angled up so that they are easily readable from both the sitting and standing position.
4.7 Controls and Cable Entries
Requirements as for 3.2.2.
