1.0 Scope
- This method statement details the method of Installation, Testing & Commissioning of Sub Main Distribution Boards (SMDBs) according to the Specification Section 16442.
2.0 Material
- All materials shall be as per approved material submittals, shop drawing and single line diagram.
- Sub Main Distribution Board.
- Cable glands and lugs.
- Identification labels and tags.
3.0 Applicable Location
- All Typical floors, Electrical Closet in E1, E2, E3 & W1, W2, W3 – Towers, L.V. rooms & Electrical Closet in Podium area.
4.0 Method
4.1 Storage
- SMDB’s shall be inspected upon receipt at site for damages and compliance with the approved submittals.
- Upon completion of receiving inspection, the SMDB’s shall be repacked.
- Material found not suitable for the project is removed from site immediately.
- Sub Main Distribution Boards shall be stored in a covered and ventilated store.
- Sub Main Distribution Boards are stored in with packing as per manufacturer’s recommendations. Packing shall be removed only prior to installation.
4.2 Installation
- Ensure approved documents like shop drawing, electrical room layout and load schedules are available with the installation team.
- Shift the particular Sub Main Distribution Boards and associated accessories to the work place with crane or Lift. Packing will be removed at the position of installation.
- Check the label/marking to ensure the right board before installation.
- Mark the fixing position of the SMDB’s as per shop drawing, coordinate with other equipment and services.
- Fix the SMDB’s with proper metal plugs and bolts. Ensure the installation is straight and leveled.
- Suitable knock-out at the top of the SMDB’s shall be used for Incoming and Outgoing cable entry.
- File the knock-out to suit the cable glands and lugs for rigid terminations.
- Suitable equipotential earthing will be provided in accordance with DEWA requirement.
- Ensure the busbars and interconnecting terminals are free from dust and damage.
- Check the breakers as per approved load schedule.
- Megger the panel.
- Megger the cables before termination.
- Terminate all the circuits to its respective breakers with proper ferrule identification.
- Dress the cables neatly with cable ties/ cable cleat.
- Double check the connections by tightening the terminations.
- Clean the SMDB’s after dressing with blower to blow out all the small particles and dust after the termination works.
- Provide identification labels as per specification / approved submittals.
- Place the approved load schedule copy inside the SMDB’s door.
- Inspection shall be offered to QC Verification.
5.0 Testing & Commissioning:
5.1 Instruments.
- Insulation tester.
- ELCB Tester.
- Multimeter.
Note : The instruments used for testing and commissioning shall be checked and ensured that they are calibrated and the current valid calibration reports are filed for record.
5.2 Method
- Physical check – Conduct A thorough visual check is conducted to ensure the components and the connections are made correctly, and recorded on the checklist as attached.
- Polarity check – Conduct polarity check to ensure the switch and the screw lamp connections are correct and record on the attached format.
- Continuity check – With the help of a Multimeter, the continuity of all the circuits are checked and ensured the resistance value is under the permissible limit.
- Insulation check – Use a insulation tester to check is there any break down of insulation between conductors, if any replace it immediately. Also record the insulation resistance value of all the circuit in the attached format.
- ELCB and Polarity Test – With the help of ELCB tester check the function of the earth leakage circuit breaker at rated current.
6.0 Safety
6.1 Safety Officer shall ensure that the technicians have undergone safety
induction program.
- Only experienced technicians shall be engaged for this specialized job.
- Workmen shall be given proper training to use PPE and to be monitored to
avoid any violation on the same.
- Electric tools to be checked and certified by Safety Officer and earthing of the
same shall be ensured.
- All other safety precautions shall be followed as per established safety plan and
procedures.
7.0 Records
7.1 Commissioning check list and test format at attached.
7.2 Inspection request duly signed-off by NMX and Consultant.