Method Statement Title: Testing and Commissioning of LV Switch boards / Panels.
1.0 Scope
1.1 This method statement details the Testing and Commissioning of LV Switch boards / Panels according to the specification section 16402.
Note : A separate method statement is submitted for installation of L.V. Switch
boards / Panels. ( Ref. ETA /MS/E-009 )
2.0 Material
- All the materials shall be as per approved material submittals.
- Size and number of LV Switch boards / Panels shall be as per approved shop drawing and load schedule.
- Identifications and labels.
3.0 Applicable Location
- L.V. rooms for E1,E2,E3 & W1,W2,W3 Towers Located in Podium areas.
4.0 Instruments.
4.1 Insulation Resistance tester ( Megger ) with Variable Voltage selections.
- Phase Sequence meter.
4.3 Multimeter.
Note : The caliberation certificates of testing instruments shall be verified prior to usage and copies shall be included in the test reports.
- Inspection Procedure :
- Visual, Mechanical and Operational checks as per the format enclosed.
- Test Procedure :
- Insulation Resistance Test using 500V Megger:
- Check the tightness of connections.
- Clean all the supporting insulators.
- Isolate the cables on incoming and outgoing side.
- Apply a megger voltage of 500Volts DC between Phase ‘R’ to earth for 1 min with Phase ‘Y’,’B’ & ‘N’ shorted and earthed and record the values.
- Similarly continue the test and record the values for the other phases.
- Operational Checks:
- Connect the required control supply as per the schematic.
- Check the operation of the switchgear i.e. closing / tripping of switchgear from local and control points.
- Check the operation of protective relays.
- Check the operation of interlocks, alarms and indications circuits as per the approved schematic
- Safety :
- Only experienced and skilled personnel shall be engaged for testing.
- Safety guards shall be in place and secured prior to start-up.
- Warning signs and tapes shall be placed during start-up and commissioning as required.
- All safety procedures shall be followed in accordance with the project health and safety plan.
- Safety officer shall check and ensure all safety precautions as followed.
- Records:
- Site Test Reports.
- Caliberation certificates of testing instruments.
9.0 Reference :
- Specification Section 16402.
- Approved Drawings.
10.0 Enclosures : Test Report for LV Switch board.
