METHOD STATEMENT MAIN DISTRIBUTION BOARDS, SUB-MAIN DISTRIBUTION BOARDS & DISTRIBUTION BOARDS TESTING

METHOD STATEMENT MAIN DISTRIBUTION BOARDS, SUB-MAIN DISTRIBUTION BOARDS & DISTRIBUTION BOARDS TESTING

TABLE OF CONTENTS

  1. Scope/objective
  2. References
  3. Access/Egress
  4. Health and safety Hazards

a. Safety Rules during testing
b. Safety lighting
c. Task lighting
d. Emergency arrangements
• General
• Fire Precautions
• Communication
e. Risks Control
• Hazards/Risks
• 3rd Party Protection
• Environmental Considerations

  1. Definitions
  2. Responsibilities/supervision
  3. Procedures/Method to be Employed
  4. Training
  5. Working hours
  6. House keeping
  7. Manpower Requirements & Supervision
  8. Testing Instruments Requirements
  9. Plant & Equipment

a. General
b. Personnel Protective Equipment
c. Power

  1. Q.C Approvals and other Documentation
  2. Supporting Documentation
  3. Distribution
  4. Other Information
  5. Site Safety Engineers Approval
  6. Attachments

1.0 Revision Status
Revision
No Date Prepared
By Reviewed
By Arabtech Approved
Revision
Description

0
19 April 05
D.SAVVA

S.GEORGIOU
K.MARNERIDES
M.PICKUP
First submission

1.0 SCOPE / OBJECTIVE

This method statement covers the testing of Main Distribution Boards, Sub-Main distribution boards and Distribution Boards.

2.0 REFERENCES

2.1 Shop Drawings ref:1505/A&P/SD/E, 1505/A&P/SD/PW & 1505/A&P/SD/LT
2.2 I.T.P- E-008 Distribution Boards.
2.3 I.T.P- E-009 Main & Sub-Main Distribution Boards.
2.4 General Electrical Specification Section 16010.
2.5 Particular Electrical Specification Section 16470 (Main Low Distribution Boards).
2.6 Particular Electrical Specification Section 16475 (Sub-Main Switchboards).
2.7 Particular Electrical Specification Section 16490 (Distribution Boards).
2.8 Load schedules.

3.0 ACCESS / EGRESS

The testing of the Main Distribution Boards, Sub-main Distribution Boards and Distribution Boards should be performed soon after the installation.

Area should be cleared of waste materials or any other obstruction.

4.0 HEALTH AND SAFETY HAZARDS.

Health and Safety procedure by Main Contractor and by A&P will be implemented for this job. The responsible safety officer as per A&P procedure will conduct a routine safety inspection.

a. Safety Rules during testing:

In order to ensure safe conditions during testing the following rules have to be followed:

• Persons engaged with inspection and testing have to be skilled and have received proper and adequate training related to procedures and test equipment utilized for the particular testing activity.
• Test instruments and test leads should be maintained in a safe condition and the test methods not to create danger either for the operator or for other persons or livestock.
• Where tests are required to circuits which have not to be energized, it is always necessary to prove that the circuit is ‘dead’ (switch off main supply & measure voltage by a calibrated multimeter) before applying the test.
• Ensure that working area is barricaded and warning label is installed where persons are conducting testing on live electrical equipment.
• Ensure that all cables/conductors and capacitors are discharged to earthing system after the test.

  b. Safety Lighting.

Safety lights will be used in case of power failure ensuring the good illumination of the working area to aid evacuation if necessary.

   c. Task Lighting.

Adequate lighting shall be provided to ensure the good illumination on the working area.

   d. Emergency Arrangements.

• General : Site general safety procedures will be followed. In case of emergency the Safety Officer or the most senior employee present will stop the work, and make the necessary emergency arrangements and report to the assembly points as described during Site Induction Course.

• Fire Precautions : No significant fire risks associated with this activity but general fire precaution measures will be taken as per Arabtec instructions to A&P.

• Communication : Communication from site areas to Site Office via mobile phones issued to senior foremen. In emergency situations the users of handheld 2-way radios to be notified if deemed that this can speed up notification of relevant personnel and/or the JBR01 Site Clinic.

e. Risk and Controls.

• Hazards / Risks
Relevant risk assessments (See Attachments):
• PRT-007 Hand Tools

• 3rd Party Protection: Applicable as per the contract only.

• Environmental Considerations: There are no waste materials associated with electrical installation testing.

5.0 DEFINITIONS

  ATC   -   Arabtec Construction (LLC.)
          A&P -     A&P Paraskevaides and Partners LLC.
  M.S. -    Method Statements.
          I.T.P-             Inspection & Testing Plan
          MDB-            Main Distribution Board
          SMDB-          Sub Main Distribution Board
          DB-                Distribution Board

6.0 RESPONSIBILITIES / SUPERVISION

6.1 Project Manager – Will have the overall responsibility of the Project for execution, quality and safety. Also he will maintain the planning progress and coordination of works with Main Contractor.

6.2 Project Senior Electrical Engineer / Site Electrical Engineer – Will be responsible for the day to day activities on site, for materials, drawings, testing & commissioning. The Project Senior Electrical Engineer will report to the Project Manager.

6.3 Supervisor – will be directly responsible for the day-to-day job/testing on site, for handling the technicians or any other staff assigned to his area.

6.4 Safety Officer – will be responsible for the Health and Safety aspects on site as per the Main Contractor and A&P Safety requirements.

6.5 QA/QC Department – will oversee the quality requirements and quality control measures for the Project in coordination with the Senior Electrical Engineer as outlined in the A&P QA Manual.

7.0 PROCEDURES / METHOD TO BE EMPLOYED.

  1. Switch off main Isolator /ACB or MCCB.
  2. Disconnect the neutral conductor from the supply to facilitate the necessary insulation resistance testing between neutral and earth.
  3. Short all the current transformers and remove all control neutral wires before proceeding to the insulation test.
  4. Carry out insulation test (between phases to phases, phases to earth and earth to neutral).
     Test voltage for MDB’s :1000V
     Test voltage for SMDB’s & DB’s :500V
  5. Ensure that all phases-neutral conductors and capacitors are discharged to ‘ground’ prior to final connection.
  6. Tabulate the results of the insulation test in the test sheet 2.0.03 TS01.
  7. When insulation test is completed firmly insert and secure in place the main incoming neutral cable, reconnect all the control neutral wires and remove all current transformer shorting terminals.
  8. Perform mechanical test (MCB’s, ACB’s,MCCB’s ,ELCB’s and isolators by switching on & off 5 times).
  9. Perform functional test of mechanical interlocks. ( Where applicable)
  10. Tabulate the results of the testing in the test sheet 2.0.03 TS01.

8.0 TRAINING

8.1 Tradesmen who will be used to perform the testing will be trained foremen/electricians. If deemed necessary specific team / individuals will undergo further training by the Production / Quality Assistance Department.

8.2 Toolbox talks will provide general training and awareness for each activity and also undergo further training by the Production / Quality Assistance Departments.

9.0 WORKING HOURS

Normal working hours: 7.00 a.m to 5.00 pm

  1. HOUSE KEEPING

There are no waste materials arising from testing.

  1. MANPOWER REQUIREMENT & SUPERVISION

For the testing of an MDB, SMDB or DB minimum two (2no) electricians are needed.

  1. TEST INSTRUMENT REQUIREMENTS

• Insulation test instruments (calibrated).

  1. PLANT & EQUIPMENT REQUIREMENTS

a. General: Markers, screw drivers, pliers.
b. Personnel Protective equipment: All personnel should wear safety shoes, helmet and coverall.
c. Power: Single-phase normal power where it is needed.

  1. Q.C. APPROVAL AND OTHER DOCUMENTATION
  2. SUPPORTING DOCUMENTATION
  3. Shop drawings
  4. Load Schedules
  5. Test instruments/Manufacturers instruction manuals
  6. DISTRIBUTION
  • Main Contractor,
  • Senior Electrical Engineer
  • Q.C. Engineer
  • Site Electrical Engineer
  • Tower Health & Safety Officer
  1. OTHER INFORMATION

Not applicable

  1. SITE SAFETY ENGINEER’S APPROVAL

Risk mitigation measures as identified in Risk Assessments in Section 19 to be inspected at regular intervals through out the duration of activity.

  1. ATTACHMENTS

• PRT-007 Hand Tools
• 2.0.03 TS-01. Test sheet

Md Abu Zaed Khan
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