METHOD STATEMENT FOR MAIN SUB-MAIN DISTRIBUTION BOARDS TESTING AND COMMISSIONING

This safe work method statement uploaded by QHSE documents for the "Method Statement For Main Sub-main Distribution Boards Testing And Commissioning" is in editable and ready-to-use format and will answer various answers to questions such as How do you test the main distribution board? What is Sub main distribution board? What is the main function of the distribution board? How many ways does a distribution board have? What are SMDB and MDB? What is an MDB in electrical? What is the role of the distribution board? What is testing and commissioning?

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1. SCOPE OF WORK

The purpose of this Procedure is the Testing and Commissioning for the following:

1.1. MSMDB

1.2. Sub-Main Distribution Boards (SMDB) 

1.3. Distribution Boards (DB) 

1.4. Consumer Units (CU)

2. TESTING, COMMISSIONING AND START-UP PROCEDURES

1.1. Upon completion of equipment installation and before carrying out test runs, the Contractor shall visually inspect the installation and satisfy that the equipment has been properly installed.

1.2. Ensure that all moving parts (if any) are free from obstructions.

1.3. It should be ascertained that the system has been installed following the design and installation drawings and that each piece of equipment operates properly.

1.4. The manufacturer’s instructions, where applicable, will be followed for the testing and commissioning of the system components.

1.5. All recommendations as per standards and regulatory requirements applicable to the project shall be followed.

Preparation

As per the procedure and requirements, the contractor and the project engineer jointly make a final inspection and will confirm that the system is installed correctly as per the design and is now ready for operation. 

The following shall be observed closely:

A. Punch List-PL: The contractor shall observe and see that all the punch list items that may directly affect the system test all complied with the Engineer/Client requirements or as per the design.

B. Notification: The Contractor shall officially inform the project Engineer and/ or Client involved and the assigned representative of the pre-determined final schedule for inspection shall be conducted and accomplished. The Contractor shall notify and inform the Engineer and/ or Client representative 48 hours before the actual inspection to enable them to witness the tests. The values will be documented appropriately and submitted for further required approval.

3. TESTING PROCEDURE MSMDBS AND SMDBS

The following tests are to be carried out on a distribution board:

2.1. Verification of nameplate details for rating following approved General Arrangement (GA) drawings

2.2. Check for physical damage

2.3. General checks

2.4. Check for Electrical/ Functional checks

2.5. Insulation Resistance tests

2.6. Check earthing connection

Test equipment/ instruments:

• Insulation resistance tester with variable voltage selections
• Multi-meters

Insulation resistance test – Procedures

• Observe and check for the correctness and tightness of all connections
• Clean all the supporting insulators
• Isolate the cables on the incoming and outgoing side
• Apply a Megger Voltage (MV) of 1000V Direct current (DC) with Respective Phases for 60-seconds and document the values correctly
• Same, proceed and continue the test and record the values for the other phases of the system
• Electrical/ Functional Checks – Steps and Procedures
• Firstly, switch on the main incoming control supply for the SMDB
• Appropriately and carefully check the electrical operation of the switchgear using the schemes
• Appropriately and carefully check the operation of the indicating devices, voltmeters, protective devices, etc. 

4. TESTING PROCEDURE OF DB’S & CU’S

The following tests are to be carried out on a distribution board:

• Verification of nameplate details for rating following approved General Arrangement (GA) drawings
• Check for physical damage and earthing connection
• General checks
• Check for Electrical/ Functional checks

Test equipment/ instruments:

• Multi-meters

Electrical/ Functional Checks – Procedures

• Switch on the main incoming control supply for the Sub-Main Distribution Boards
• Appropriately and carefully check the electrical operation of the Circuit Breaker (CB)
• Appropriately and carefully check the availability of voltage on the Circuit Breaker (CB) by using a multi-meter (MM)
• Appropriately and carefully check the operation of the Indicating Devices (IDs), Voltmeters (VMs), Protective Devices (PDs), etc. mounted in the panel using the same scheme and technique.

Before Energization

Check:

• Busbar chambers, 
• Main and sub-main switch connections i.e.
• Bolts and nuts tightness.
• Earthing connections at compartments, 
• All switches and earth electrodes.
• Clearance of live parts from direct contact with or any possibility of contact with tools, spurious Bare Conductors (BC) remaining in switches, Circuit Breakers (CB) and Switch Cubicles (SC).
• Vacuum cleaning of switches and Breakers.
• Provision of danger and warning signs.

Switch on Process

• Whenever there is any break of time e.g., the next day, in carrying out the switch-on process, a re-test of insulation resistance is required.
• Switch on the main incoming with all other outgoing breakers off.
• If normal, switch on other Sub-Main Switches (SMSs) one by one with all other outgoing switches off.
• If normal, then switch on all other outgoing switches one by one.
• Stay at the site and keep vigilance for approximately 30 minutes to see if any smell or unusual noise is being generated by the installed system.

5. ACCEPTANCE 

After the system is completely examined, tested, and inspected appropriately and all design or highlighted comments have been duly complied with and done, the project installation, testing and commissioning Engineers shall sign the Acceptance Certificate (AC) verifying that the system is completely accepted and shall be ready for handing over to the client.

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METHOD STATEMENT FOR MAIN SUB-MAIN DISTRIBUTION BOARDS TESTING AND COMMISSIONING