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Tuesday, September 15, 2020

Method Statement for Installation of Sub-Main Distribution Boards (SMDB) & Distribution Boards (DB)

Purpose

The purpose of this Method Statement is to describe the details used and controls to be carried out for the installation of Sub-Main Distribution Boards & Distribution Boards to ensure that it complies to Project requirements, specifications (Section 26 02413) and standards.

Scope of Work

This Method Statement applies to all Sub-Main Distribution Boards & Distribution Boards at Doha Convention Centre & Tower Project Electrical Works.
Manpower and equipment shall be organized to meet the schedule as per the approved construction program. 

Definition

Abbreviation

SMDB    -  Sub Main Distribution Board
DB        -  Distribution Board
QAQC    -  Quality Assurance Quality Control
MS        -  Method Statement 
MEP       -  Mechanical, Electrical, Plumbing
RFIA       -  Request for Inspection & Approval
MIR -  Materials Inspection Request
ITP -  Inspection and Test Plan
TBT - Tool Box Talk

 “Approved” or “Approval” 

Approved means approved in writing by the applicable Engineers. Assistant acting within the scope of their delegated authority.

“Shop Drawings” 

“Shop Drawings-(SD)” means the production of drawings where the contract designs drawings need expressing in the more initial form to simplify and ease construction.

“Final Inspection”

“Final Inspection-(FI)” means the inspection of the records of works at completion or after pre-determined elements to ensure that all previous inspections and tests have been satisfactorily conducted and appropriately documented.

“Method Statements”

“Method Statements-(MS)” means a technical document to be read in conjunction with the approved drawings, specification, standards and codes of practice (Sop’s), technical datasheets, schedules, work instructions and any other technical document related to a particular work.

Reference Documents – Specifications, Drawings. Etc.

  1. Project Quality Plan 
  2. Project Specification
  3. Approved Shop Drawings
  4. Approved Material Submittal 
  5. Regulations

Tools and Equipment

Equipment / Instrument

  • Insulation Resistance Tester - 1000V DC
  • Multi-meter Tester
  • Tools
  • Electrician Hand Tool
  • Drilling Machine & Hole Saw cutter set
  • Electric Grinder
  • Spanners
  • Half Round file
  • Pliers & Screw Drivers
  • Open and Box Wrench
  • Ball Hammer
  • Crimping tool

Manpower

Staff:
  • Construction Manager
  • Site Engineer
  • Supervisor
  • QC Engineer / Inspector
  • Quantity Surveyor
  • Safety Officer

Labour:

  • Foreman
  • Trade workers
  • Helpers / Labours
  • Drivers

Responsible Personnel on Site

  1. The Project Manager shall be responsible for the overall construction activities.
  2. The Construction Manager, Site Engineers, Supervisors and Foremen shall implement this Method Statement.
  3. The Material controller shall be responsible for receiving materials on-site warehouse.
  4. Site Engineer / Supervisor shall check the materials as per manufacturer's recommendation before installation and shall be responsible for the installation as per approved shop drawings.
  5. Safety Officer shall ensure that appropriate/necessary measures are in place at the work location to avoid any unexpected events.
  6. QAQC Inspector shall be responsible for carrying out inspections for the materials delivered on-site. He shall document such inspections.
  7. QAQC Engineer / Inspector shall monitor the installation activities progressively and shall record all deviation from the specification in a form of snags or further as non-conformance notification.

Material Inspection / Storage

  1. All materials and/or equipment received or purchased shall be inspected and approved by the Supervision Consultant before using on-site. 
  2. Unload the panels in the designated unloading area. Use forklift or crane to unload self-standing panels.
  3. Proper care must be observed during off-loading to prevent unnecessary damage for sub-main & distribution boards.
  4. Ensure that sub-main & distribution boards are stored in a dry and clean area.
  5. Before acceptance, an inspection regarding the physical condition of the panels shall be conducted and to ensure that the country of origin, components are following the approved material submittal.
  6. Ensure that the sub-main & distribution boards are properly protected and covered by a tarpaulin.
  7. Submit Material Inspection Request to the consultant for their inspection and approval.

Construction Sequence and Methodology

Preparation before Installation
  1. Ensure that Drawings for Installation are approved & coordinated with other services.
  2. Check the material to be used is inspected and MIR approved.
  3. Check if the work location/area is ready without any obstruction.
  4. Perform breaker inspection and test the mechanical functions.
  5. Ensure that all Cables / Wires are tested for Insulation and Continuity before Glanding and Termination.
  6. Before starting the work, check that all safety precautions are in place.

Installation 

  1. The floor of electrical rooms shall be painted and ready for permanent installation of SMDBs.
  2. Move the panels from the storage area to the designated electrical room. Panels shipped on a timber sub-base shall be lifted under the sub-base by forklift. Unpack and remove the panels from its timber base. Care must be
  3. Move-in the panels using rollers to its final location. Care must be taken to ensure that the panel does not overbalance while being move to its final location.
  4. Align the panel horizontally and vertically. And fix the panel to floor using anchor bolts.
  5. Clearance between panels and walls shall be following Approved shop drawing / Approved Installation details.
  6. Ensure that the panels are installed properly in its designated location as shown in the shop drawings.
  7. Remove all unused bolts, nuts, washers and clean the panel. Panel side covers and doors shall be put back ensuring that they are properly tightened.
  8. Ensure the tightness of all terminals using calibrated torque wrench before closing the shrouds.
  9. Ensure that the Load Schedule / Wiring Diagram is provided inside the panel.
  10. Installation and commissioning shall be as per manufacturer recommendation.
  11. Cover or protect all installed Panel boards to prevent the accumulation of dust and debris during construction.
  12. Ensure that workmanship is neat and clean and complying to good construction practices.

Installation Procedure – Wall-mounted Sub Main Distribution Boards & Distribution Boards

  1. The walls of electrical rooms shall be painted and ready for permanent installation of SMDBs & DBs’
  2. Mark the location of the panel on the wall. Wall-mounted panels shall be installed on the maximum at 1829mm height from F.F.L to the top of the board or otherwise stated in the shop drawing.
  3. Install the uni-strut channel supports on the walls. Make sure that the supports rigidly and securely fixed.
  4. Fix the panels on the support. Ensure that the panels are rigidly fixed in its supports and aligned vertically & horizontally, through the use of level and plumb.
  5. Remove unnecessary foreign materials and unused bolts, nuts and washers inside the panel. Fix the panel cover and protect with a plastic sheet.
  6. Dress and terminate properly the wires and cables inside the panels. Panels shall be connected to the designated earth bar as shown on the approved shop drawings.
  7. Circuit label and panel description shall be provided with approved cable tag and markers.
  8. All circuits shall enter to the distribution board through GI conduit & GI trunking directly to the distribution boards on both sides.
  9. G.I connections to DBs and SMDBS shall be provided utilizing G.I conduits and trunking with manufacturer recommended accessories.
  10. 1IP rating shall be maintained during the installation.
  11. Ensure to plug all knockouts removed and not utilized.
  12. Ensure the tightness of all terminals using calibrated torque wrench before closing the shrouds (for SMDB only).
  13. Ensure that the Load Schedule / Wiring Diagram is provided inside the panel.
  14. Cover or protect all installed Panel boards to prevent the accumulation of dust and debris during construction.
  15. 15. Ensure that workmanship is neat and clean and complying to good construction practices.

Inspection and Testing

  1. After completion of the work, the Site Engineers who perform an activity are required to raise an RFIA with complete information regarding the scope of the inspection, including Test Report & necessary drawings highlighted to show the scope of the inspection. He shall systematically check and inspect their work. The inspection shall be performed according to a typical checklist and approved Inspection and Test Plans (ITP). 
  2. After Site Engineer’s completed their inspection, RFIA with duly filled Inspection Check List shall be submitted to QAQC Department who after internal inspection shall process the documents to have completed work inspected by Supervision Consultant for their approval.
  3. After satisfactory inspection by Supervision Consultant, Completed work shall be subject for re-testing for the next activity of works.
Note:
  • RFIA must be processed and submitted to the Supervision Consultant 24 hours before the actual inspection and/or witnesses.
  • The preparatory meeting shall be carried out to the execution team as per method statement, material submittal & shop drawings before the start of work on-site (by QA. QC Personal).

Health, Safety and Environment

Safety of all personnel and equipment is the highest priority of ETA-Debbas JV during the execution of the Works.
  1. Personnel Protective Equipment
  2. Safety Helmet
  3. Safety Goggles (during drilling and use of grinders)
  4. Face shield (during grinding)
  5. Safety Footwear (steel toes)
  6. Safety Gloves (for material handling)
  7. Coverall (as protective clothing)
  8. Full Body Harness 
  9. Respiratory Mask (if require)
  10. Tool Box Talk (TBT)
  11. Safety Tool Box Talk shall be given by the site supervisor every week and/or as deemed necessary.
  12. Safety tool Box Talk shall brief the task/subject and shall be given in languages understandable by the multinational workforce.
  13. Safety Tool Box Talk attendance shall be recorded on a sheet and signed by attendees.

Housekeeping

Housekeeping shall be maintained by all personnel working at the site. Housekeeping for fabrication and installation shall be as per the project safety plan and ETA-Debbas Safety Manual.

Signage

  1. All necessary safety warning and caution signs shall be displayed at work locations.
  2. QC Approval and Other Documentary Requirements ( Attachment)
  3. Material Technical Submittal Approval
  4. Shop Drawing Approval
  5. Material Inspection Report (MIR) approval
  6. Installation Request for Inspection & Approval (RFIA)

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