METHOD OF STATEMENT FOR TESTING OF MAIN DISTRIBUTION BOARDS.pdf

PPT FORMAT

1. YAS WATER WORLD
ABUDHABI
VENKATESAN.B
GULF POWER
8/16/2025
METHOD OF STATEMENT FOR TESTING OF MAIN
DISTRIBUTION BOARDS, SUB MAIN DISTRIBUTION BOARDS,
AND DISTRIBUTION BOARD

2. Page 1 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825
















Internal
Document
Number
Rev
.
No.
No.of
Pages
Prepared Reviewed PMApproved DateIssued
to the
ENGINEER
By Date By Date By Date

Gulf Power

GP/ENO/15825

00

10
Venkatesan 15-08-2025 Dhanapal R 15-08-2025






Enova

3. Page 2 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825






































S.NO CONTENTS
1 Purpose
2 Scope
3 References
4 Definitions


5
Resources
5.1 Materials
5.2 Drawing
5.3 Equipment
5.4 Human Resource

6 HSE Precautions
7 Sequence of testing of MDB panel
7.1 Sequence testing for MDB Panel
7.1.1 Thermography Test
7.1.2 Visual inspection Test
7.1.3 Insulation Resistance Test
7.1.4 Bus Bar Contact Resistance Test
7.1.5 ACB Secondary Injection Test
8 Sequence of testing of SMDB and DB
8.1 Visual inspection for SMDB
8.2 Insulation resistance Test for SMDB
8.3 Visual inspection for DB
8.4 Insulation resistance Test for DB
8.5 Loop Impedance Test for DB and SMDB
8.6 Thermography Test for DB and SMDB
8.7 Continuity Test
8.8 RCD Trip test for DB
8.9 Earthing for DB and SMDB panels

9 Attachments

4. Page 3 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825



1. Purpose:
 The objective of this method statement is to establish the necessary guidelines for the
testing of MDB, SMDB and Distribution boards as per the contract requirements.
 This Method of Statement shall ensure that for the testing of MDB,SMDB and Distribution
board executed safely.
 This Method of Statement Aims to ensure that the quality assurance and quality control
activities are conducted in a systematic manner, works are inspected and conformance
is verified and documented.


 This Method of Statement covers the references,resources and sequence for the testing of
MDB,SMDB and Distribution boards as per the contract requirements and standards.
 Drawing
 Specification and technical datasheet

 PM :Project Manager
 QC :QA/QC Engineer
 ERT :Emergency Response Team
 SO :Safety Officer
 GS :General Specification
 MS :Method Statement
 ADM :AbuDhabi Municipality
 ADDC :AbuDhabi Distribution Company
 ADAC :AbuDhabi Airport Company
 ENGINEER :Consultant/Engineer
 CD :Contract Drawing
 SD :Shop Drawing
 NOC :No Objection Certificates
 PPE :Personnel Protective Equipment
 DB :Distribution Board
 SMDB :Sub Main Distribution Board
 MDB :Main Distribution Board
 Project Manager :Bhuvaneshwaran Natrajan
 Sr.Project Engineer : Venkatesan Balraman(ADDC Certified)
 Testing Engineer : Abiram
2.Scope ofWorks
3.Reference
4.Definitions

5. Page 4 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


 Testing Technician-1 : Palanivelpillai(ADQCC Certified)
 Testing Technician-2 : Sajjad Alam(ADQCC Certified)
 Testing Technician-3 : Prabhakaran.G(ADQCC Certified)

5.1 Tools:
 General tools

5.2 Drawing:
 Existing as built drawing shall be provided by M/s.Enova

5.3 Plant and Equipment:
The following list of equipment shall be used when ever needed but not limited to:
 Multimeter(FLUKE-179)
 Multifunctionmeter(FLUKE-1664FB)
 1KvInsulationTester(FLUKE-1503)
 5KvInsulationTester(MEGGER-MIT515)
 ThermalImageTester
 Bus bar contact resistance kit.
 ACB Secondary injection test kit
 Earth Pit Resistance Tester
Note: The Calibration Certificate for the above-mentioned testing equipment’s are submitted
separately. In addition, Hard copies are maintained at site.

5.4 Human Resources:
 ElectricalEngineer
 Electrician
 Helper

6.1Activity Hazard Analysis, Risk Assessment, Precautions and Emergency
Arrangements

6.1.A Task Sheets:

Task sheets shall be developed jointly by the Testing team and the HSE team for all activities
applicable to Testing works. Task sheets describe in detail the safe system of work to be
employedandprovidespecificinformationregardingtraining,certification,supervision,PPE,permittowor
k
requirements.TasksheetsmustbecommunicatedtotheworkforcebytheSEpriortocommencementand
at regular intervals thereafter or after any significant change in the safe system of work. All
5. Resources
6. HSE Precautions

6. Page 5 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


persons attending Pre-task briefings shall sign the task sheet attendance form.

6.1.BRisk Assessments:

 Riskassessmentswillbeproducedforallactivitiesdescribedin
this methodstatement.Riskassessments shall be communicated to the workforce prior to
commencement of works.
 The applicable risk assessments are attached.

Falling Objects
 Stand clear when the testing is executed at height and wear helmet and safety shoes.

Personal Protective Equipment
 PPE shall be worn at all times and shall be reinforced by site supervision at all times. The
site PPE requirements are Reflective safety vest, Safety helmet, Safety Boots, safety hand
gloves,Insulated Hand gloves class 0 and arc flash
kit.SpecialistPPEwillberequiredforspecifictasks.TheHSEteamshallbe responsible for the issue
and selection of all PPE.
6.1.C Emergency Arrangements

Ensure emergency arrangements are in place.
Site EmergencyContactNumber:
Name Position Contact
AbiramThandal Testing Engineer 055 4301519
Venkatesan Balraman Sr.Project Engineer 050 7323416
Breswin Bero HSE Engineer 0524568270
Bhuvaneshwaran Natrajan Project Manager 054 3099188
First Aider
Sajjad Alam Testing Technician 056 8617463

The roles and procedure of Emergency Response Team will be as follows:

 The Emergency Response Team (ERT) role is to manage any emergency situation which may

7. Page 6 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


arise on site. The Emergency Response Team (ERT) team will help to minimize any human
suffering and economic losses that can result from emergencies.
 The response to an emergency shall follow the Emergency Procedures. In summary, the
ERT will be summoned, the Project In-Charge (PIC), if required, will call the ambulance
and first aid, and or request any emergency equipment. In case of rescue of a person
partially or totally unconscious, it is required and permitted to clear first the face of the
person before first aid intervention. Project In-Charge (PIC) and first Aid shall carry the first
breathing check and administer eventually cardio-pulmonary-resuscitation (CPR).

8. Page 7 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825





7.Sequence of Testing for MDB Panel

9. Page 8 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


7.1 Sequence of Testing for MDB Panel

 As per PTW andclient approval,The Followingtestwill be carriedout without shutdown and ACB
breaker and ELR test will do on Annual Maintenance.
7.1.1 ThermographyTest
7.1.2 VisualInspectionTest.
7.1.3 Insulationresistancetest
7.1.4 Bus barcontactresistance
7.1.5 ACBSecondaryinjectiontest

7.1.1 ThermographyTest:
To outline the method and safety procedures for carrying out thermographic inspection on electrical
and mechanical equipment to identify potential issues through thermal imaging. Applicable to electrical
panels, switchboards, transformers, motors, cables, HVAC systems, and rotating equipment.


 Capture Thermographic Images:
 Position the Thermal kit(Fluke Tis55+) Camera to cover components like breakers,
busbars, terminations, cable joints, etc.
 Capture both thermal and visual images (most IR cameras have dual modes).
 Measure and record temperature readings of all connections.
 Note ambient conditions: room temperature, load current, etc.
 Tag anomalies (hot spots, unbalanced loads, etc.) with temperature difference (>10°C
above ambient is typically considered abnormal).
 If safe and applicable, compare with similar phases or identical components for baseline.

Priority
ΔT Between similar
components under similar
load
ΔT over ambient
temperature
Recommended Action
4 1 °C to 3 °C 1 °C to 10 °C
Possible deficiency: warrants
investigation or no action required.
3 4 °C to 15 °C 11 °C to 20 °C
Indicates probable deficiency: repair as
time permits.
2 --- 21 °C to 40 °C
Monitor until corrective measures can be
accomplished.
1 16 °C and above 40 °C and above Major discrepancy: repair immediat

10. Page 9 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


 Safety Procedures:
• Ensure al lthe Worker and staff are using PPE.
• Conduct theToolboxtalk record for all the staff.
• Remove the rear panel cover by using the Insulated Hand Gloves class 0.
• Maintain a safe distance from the Live panel.
• Take the Picture of Busbar of panel by using thermalimagekit(Fluke Tis55+).
• Then comparing ambient temperature and atmosphere temperature.
• Close the rear panel cover by using the Insulated Hand Gloves Class 0.
• Report will be submitted accordingly.


7.1.2 Visual Inspection Test:

• Make visual inspection of MDB panel.
• Checking all the indication lamp are functional.
• Ensure the Selector switch are functional.
• Ensure Voltmeter and Ammeter are in working condition.
• Visually Inspect the Body Earth of the MDB Panel.
• Checking Life safety equipment are installed or not.
• Ensure any physical damage of the breaker.
• Check whether proper gland earth are provided.

 Isolation Procedure:

 Prior to the execution ofInsulation Resistance, Contact Resistance and Secondary
injection test on ACB:
 The Corresponding MDB which needs to be isolated is initially Identified and
marked.
 Notification shall be provided to M/s. Enova Team regarding the Isolation
 After the confirmation from M/s. Enova Team. The Marked MDB will be isolated
under the Supervision of M/s. TUV Team.
 Ensure the Zero status of the MDB by measuring the voltage using a multimeter
 LOTO shall be established at the bus bar compartment of the MDB.

11. Page 10 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


7.1.3 Insulation Resistance Test:

 MDB Shall be De energized by FM team.
 Confirm the cable is de-energized and isolated from all sources.
 Ensure the zero status of the MDB by measuring the voltage using Multimeter (Fluke True
RMS 179).
 Discharge the cable safely before and after testing.
 LOTO shall be established at the outgoing breaker in MDB that is feeding to the corresponding
SMDB.
 Review approved drawings, cable schedules, and test formats.
 Remove the Cable from Out going breaker which is feeding to(O/G)and use PPE
(safetyjacket,helmet, Shoes and Insulated Hand gloves) during work.
 Barricade and provide warning signage’s around the testing zone to prevent unauthorized
entry and to make aware of other workers.
 Inject test voltage according to the equipment connected in DB:
 500V DC: For LV circuits up to 500V
 1000V DC: For 440–600V systems
 2500V or 5000V DC: For MV equipment (motors, transformers)

 Connect the free test probes to any two conductors required to be tested as per below.
 Injecting 500VDCvoltage for the wire and1000VDC for the Cable test
Duration of 1minute as below
• Set the IR Tester (Megger MiT515) to the appropriate test voltage (usually 500V DC for
low-voltage MDBs).
• Two Sequence of test will be carried out on the ACB
Sequence:1 Close Condition:
• Connect the cable of the IR Tester(Megger MiT515) in the ACB Busbar in the following
sequence Below:
Phase to Phase (R–Y)
Phase to Phase (Y–B)
Phase to Phase (B–R)
Phase to Neutral (R-N)
Phase to Neutral (Y-N)
Phase to Neutral (B-N)
Sequence:2Open Condition:
• Connect the cable of the IR Tester(Megger MiT515) in the ACB Busbar in the following
sequence Below:
Phase to Phase (R–R’)

12. Page 11 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


Phase to Phase (Y–Y’)
Phase to Phase (B–B’)
Neutral to Neutral (N-N’)
 After Completion of the IR test in the following ACB remove the IR tester (Megger
MiT515) Cable from the ACB busbar.

13. Page 12 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


7.1.4Busbar contact resistance Test:
 Purpose:
To measure and verify the contact resistance of bus bars and connections in the ACB and MDB
panel. This ensures all bolted or clamped joints are of low resistance, indicating good electrical
continuity and proper installation.
 Scope
Applies to all ACBs and bus bar systems in Main Distribution Boards (MDBs) as part of pre-
commissioning or maintenance testing.

 Pre-Test Requirements
• Confirm power is completely isolated and de-energized.
• Apply Lockout-Tagout (LOTO).
• Visually inspect bus bars and bolted connections for:
Corrosion
Loose connections
Dirt or grease
• Ensure all connections are torqued to manufacturer’s specifications.


 Test Equipment
Digital Micro-Ohmmeter / Contact Resistance Tester(Megger DLRO-100EP)
 Capable of injecting DC current (typically 10A–100A or more)
 High resolution in micro-ohms (µΩ) range
 Procedure
 Identify the test points:
 Across each phase-to-phase and phase-to-neutral bus bar joint.
 Across ACB main contacts, bus bar joints, cable terminations.
 Connect the micro-ohmmeter using the 4-wire (Kelvin) method:
 Two leads for current injection
 Two leads for voltage measurement
 This minimizes lead/contact resistance error.
 Inject test current as per equipment specs (typically 10A to 100A DC, depending on
system).
 Record the resistance values, typically in micro-ohms (µΩ) or milli-ohms (mΩ).

14. Page 13 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


 Repeat for all connections:
 ACB line and load side
 Bus bar joints within the MDB
 Cable terminations at the ACB/MCCB terminals
Acceptance Criteria
 Resistance should be as low as possible, usually:
o < 100 µΩ for bolted joints
o < 50 µΩ for silver-plated or copper bus bars
 Any value showing a significant deviation from similar connections should be investigated.
 No hot spots or signs of overheating on connections.

7.1.4 ACB Secondary injection test:
Purpose
To verify the correct operation of the protection functions (overcurrent, short circuit, ground fault, etc.)
of the Air Circuit Breaker (ACB) by simulating electrical faults using a secondary injection test set.
Scope
• Applicable to all ACBs installed in Main Distribution Boards (MDBs), Sub-Main Distribution
Boards (SMDBs), or Motor Control Centers (MCCs).
 Includes testing of protection relay logic, trip units, and communication functionality.
Pre-Test Requirements
 Ensure ACB is completely isolated and de-energized.
 Apply Lockout-Tagout (LOTO) procedure.
 Confirm relay settings according to approved protection coordination study.
 Review manufacturer’s manual for test procedures specific to the ACB model.
 Visually inspect the ACB for physical damage or loose connections.
 Execution of Tests
Perform tests for each protection function using the Secondary injection test kit(Siemens
ETU Tester Sentron WL):
 Initially connect the testing probe of Secondary injection test kit(Siemens ETU Tester Sentron WL)
in the Testing Port near to the micrologic of the ACB:
 Then Initiate the test as per the sequence below:

15. Page 14 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


 Long-Time Delay (L):
 Inject current slightly above long-time pickup.
 Measure time to trip and compare to setpoint.

 Short-Time Delay (S):
 Inject higher current and measure delay before tripping.
 Instantaneous (I):
 Inject high current with no intentional delay.
 Confirm immediate trip.
 Ground Fault (G) (if enabled):
 Simulate fault current and verify trip behavior.
 Trip Signal Verification:
 Ensure the breaker opens mechanically and feedback signals (if any) operate.
Acceptance Criteria
 All functions must trip within the time and current settings defined in the coordination study.
 Trip curves must match manufacturer's Time-Current Characteristic (TCC) curves.
 The ACB must reset properly after trip and function without mechanical issues.
 No alarm or malfunction should be present after reset.
Post-Test Actions
 Disconnect test equipment.
 Restore relay settings (if changed for testing).
 Reset and close the breaker (in open position, unless authorized to energize).
 Remove LOTO only after test documentation is completed and verified.

16. Page 15 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825



8. SequenceofTestingfor SMDB & DB Panel

8.1 VISUAL INSPECTION FOR SMDB

8.2 IR TEST FOR SMDB

8.3 VISUAL INSPECTION FOR DB

8.4 IR TEST FOR DB

8.5 LOOP IMPEDENCE TEST FOR DB AND SMDB

8.6 THERMOGRAPHY TEST FOR DB AND SMDB

8.7 CONTINUTITY TEST

8.8 RCD TRIP TEST FOR DB

8.9 EARTHING FOR SMDB & DB PANELS

8.10 PHASE SEQUENCE TEST

17. Page 16 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


8.1 Visual inspection for SMDB:
 Check insulation for physical damage.
 Check Cable surfaces and terminations must be dry and clean.
 Ensure cable ends are disconnected from equipment to avoid back feed or equipment
damage.
 Confirm the correct test voltage based on the cable type and rating.
 Ensure whether the cable is in burned or heated condition.

8.2 InsulationResistanceTest for SMDB:
 SMDBShallbeDeenergizedbyFMteam.
 Confirm the cable is de-energized and isolated from all sources.
 Ensurethezero status of the SMDBby measuring the voltageusingMultimeter (Fluke True RMS
179).
 Discharge the cable safely before and after testing.
 LOTOshall be established. (fed from MDB outgoing isolator)
 RemovetheCablefromOutgoingbreakerwhichisfeedingto(finalDB)andusePPE(safetyjacket,
helmet, Safety Shoes and Insulated Hand gloves Class 0) during works.
 Barricade and provide warning signages around the testing zone to prevent unauthorized
entry and to make aware of other workers.
 The insulation resistance test is performed to ensure the integrity of the cable's electrical
insulation.
 TheleadsusedforconnectingIRtestingwiththecircuitshouldbefaultfreeandthetwoconnectingl
eads should have electrical continuity.
 Connectthefreetestprobes of IR Tester (Megger MiT515)
toanytwoconductorsrequiredtobetestedasperbelow.
 Injecting500VDCvoltageforthewireand1000VDCfortheCabletestdurationof1minuteasbelow

8.2.1.1.1 Between phase and neutral.
8.2.1.1.2 Between phase to earth.
8.2.1.1.2 Between neutral to earth.
8.2.1.1.3 Between phase and Phase.

 Recordthevalue

Note:The minimum acceptable value of IRtest is 0.5MΩ, if otherwise the cable/wire are
faulty and shouldbe rectified.

18. Page 17 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


8.3 Visual inspection for DB:
 Check insulation for physical damage.
 Check Cable surfaces and terminations must be dry and clean.
 Ensure cable ends are disconnected from equipment to avoid back feed or equipment damage.
 Confirm the correct test voltage based on the cable type and rating.
 Ensure whether the cable is in burned or heated condition


8.4 Insulation Resistance Test for DB:
 DB Shall be De energized by FM team.
 Confirm the cable is de-energized and isolated from all sources.
 Ensurethezero status of the DBby measuring the voltageusingMultimeter (Fluke True RMS
179).
 Discharge the cable safely before and after testing.
 LOTOshall be established at the outgoing breaker in SMDB that is feeding to the corresponding
DB.
 Review approved drawings, cable schedules, and test formats.
 RemovetheCablefromOutgoingbreakerwhichisfeedingto(O/G)andusePPE(safetyjacket,helmet,
Shoes and Insulated Hand gloves) during work.
 Barricade and provide warning signages around the testing zone to prevent unauthorized
entry and to make aware of other workers.
 Inject test voltage according to the equipment connected in DB:
 500V DC: For LV circuits up to 500V
 1000V DC: For 440–600V systems
 2500V or 5000V DC: For MV equipment (motors, transformers)

 Connectthefreetestprobestoanytwoconductorsrequiredtobetestedasperbelow.
 Injecting500VDCvoltageforthewireand1000VDCfortheCabletestdurationof1minuteasbelow

 Betweenphaseandneutral.
 Betweenphasetoearth
 Betweenneutraltoearth
 Betweenphasetophase
 Record the Value
 After Completion of testing DB, Energize the outgoing breaker and ensure the power supply
by using the Multimeter (Fluke True RMS 179).
Note:TheminimumacceptablevalueofIRtestis0.5MΩ,ifotherwisethecable/wirearefaultyandsho
uld be rectified.

19. Page 18 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


 Test procedure for DB’s:
 Connect the positive lead of the IR Tester (Megger MiT515)to the conductor.
 Connect the negative lead of the IR Tester (Megger MiT515)to earth/ground or another
conductor for phase-to-phase tests.
 Set the appropriate test voltage on the IR Tester (Megger MiT515).
 Press the test button and maintain for ~1 minute.
 Record the insulation resistance value (in MΩ or GΩ) obtained in the IR Tester (Megger
MiT515).
 Typical minimum acceptable values:
 LV Circuits: ≥1 MΩ
 Motors: ≥2 MΩ for 1kV rated motors
 MV Cables: ≥100 MΩ depending on rating and length
 For 3-phase cables: Test L1-L2, L2-L3, L1-L3, and each phase to Earth.
 For motors and panels: Test each winding or terminal to earth and between phases.
 After each test, discharge the circuit to ground to remove residual charge.


IR TEST WORK AT HEIGHT IN SITE:

 To safely perform insulation resistance (IR) testing on electrical cables, panels, or
equipment located at a height above 10 feet at site.
 Inspect manlift and scaffolding, ensure green tag status.
 Operator positions manlift at required location; scaffold to be properly erected if required.
 Use full-body safety harness with lifeline anchored at a rigid support.
 Use only certified ladders/scaffolds/man lifts.
 Area to be barricaded and warning signs displayed.
 Minimum two persons (buddy system) during work at height.
 Test equipment leads should be handled carefully to avoid tripping/falling hazards.
 Connect IR tester leads to the equipment under test.
 Perform IR test as per standard values (usually 500V/1000V depending on equipment
rating).
 After test completion, safely disconnect test leads.
 Descend carefully and clear the work area.
 Remove LOTO only after confirming job completion and supervisor’s clearance.

20. Page 19 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825

21. Page 20 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825



8.5 LoopImpedanceTest for DB and SMDB:
 TheTestisprotectionagainstthefaultcurrentoccursinthecircuitandswitchedoffthecircuitbreaker.
 Connecttheprobe of the Multifunction meter (Fluke 1663)in Neutral Busbar, Other Probe in
Earth Busbar and the Final probe in Each outgoing circuit Breaker
 Settheswitchpointatloopimpedanceatnotripmodebyusingmultifunctionmeter (Fluke 1663)
 Makethetestandrecordthevalue
 Repeatthesameprocedureforallthe circuits present in the SMDB and DB Panel.

22. Page 21 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


8.6 ThermographyTest for SMDB &DB :

To outline the method and safety procedures for carrying out thermographic inspection on
electrical and mechanical equipment to identify potential issues through thermal imaging.
Applicable to electrical panels, switchboards, transformers, motors, cables, HVAC systems,
and rotating equipment.

 Capture Thermographic Images:
 Position the Thermal kit(Fluke Tis55+) Camera to cover components like breakers,
busbars, terminations, cable joints, etc.
 Capture both thermal and visual images (most IR cameras have dual modes).
 Measure and record temperature readings of all connections.
 Note ambient conditions: room temperature, load current, etc.
 Tag anomalies (hot spots, unbalanced loads, etc.) with temperature difference (>10°C
above ambient is typically considered abnormal).
 If safe and applicable, compare with similar phases or identical components for baseline.

 Safety Procedures:
 EnsurealltheWorkerandstaffareusing PPE
 ConducttheToolboxtalkrecordforallthestaff
 Removetherearpanelcoverbyusingthehighvoltagegloves.
 Maintain a safe distance from the live panel.
 TakethePictureofBusbarofpanelbyusingthermalimagekit(Fluke Tis55+)
 Thencomparingambienttemperatureandatmospheretemperature.
 Reportswillbesubmittedaccordingly.

23. Page 22 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


 THERMAL IMAGE STANDARDS (ANSI/NETA -MTS 2007)

1. Thermography Standard and level od acceptance is defined ANSI/NETA-MTS 2007, This is
globally accepted Standard.
2. Following are the acceptance/recommended actions given.





8.7 Continuity Test:

This method covers the procedures and responsibilities for conducting continuity tests on electrical
cables, wiring, and bonding systems before energizing the system.

 Tools and Equipment:

 Digital Multimeter or Continuity Tester
 Insulation Resistance Tester
 Test Leads with Probes/Clips
 Personal Protective Equipment (PPE)

 Test Procedure:

 Isolate the circuit at the distribution board.
 Ensure that the cable to be tested is not connected to any live source.
 Identify both ends of the conductor or circuit.



Priority
ΔT Between similar
components under similar
load
ΔT over ambient
temperature
Recommended Action
4 1 °C to 3 °C 1 °C to 10 °C
Possible deficiency: warrants
investigation or no action required.
3 4 °C to 15 °C 11 °C to 20 °C
Indicates probable deficiency: repair as
time permits.
2 --- 21 °C to 40 °C
Monitor until corrective measures can be
accomplished.
1 16 °C and above 40 °C and above Major discrepancy: repair immediat

24. Page 23 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


 Testing Method:

 Set the continuity tester or multimeter to continuity mode (ohms or beep mode).
 Connect one test lead to one end of the conductor and the other lead to the opposite
end.

 Observe the reading:
 If using a continuity tester: A beep or zero/very low resistance reading (close to 0 Ω)
confirms continuity.
 If using a multimeter: A resistance of less than 1 ohm is typically acceptable.
 For multi-core cables, repeat the process for each conductor (L1, L2, L3, and E).
 Record all readings in a Continuity Test Sheet for documentation.

 Acceptance Criteria:

 All conductors show continuity (closed circuit).
 Resistance should be close to zero (≤1 ohm).
 No open circuits are permitted.

25. Page 24 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


8.8 RCD TRIP TEST FOR DB:
Purpose
To verify that the Residual Current Device (RCD) operates correctly by disconnecting the circuit
when the residual current exceeds its rated trip value, ensuring protection against electric shock and
fire.
Scope
 Applies to all RCDs and RCCBs (Residual Current Circuit Breakers), RCBOs (with overcurrent
protection), installed in:
o Distribution Boards (DBs)
o Final Circuits
o Socket Outlets
o Lighting and general-purpose circuits.
Pre-Test Requirements
 Confirm installation is complete.
 Ensure the RCD is properly installed and energized.
 Verify RCD rated residual current (e.g., 30mA, 100mA, 300mA).
 Confirm the load is disconnected (if needed) to avoid unwanted trips.
 Notify all affected personnel that testing will take place (power interruption).
 Ensure test instrument is calibrated and functional.
TEST PROCEDURE
 To ensure the RCDs installed will trip fast enough in the event of a fault,to
preventelectrocution.
 Plugin test multifunctionmeter (setattheratingoftheRCD),and set the test at0.5of the
RCD'srated tripping current - the RCD must not trip out.
 Repeat the test at the rated tripping current of the RCD ,the device should tripout
in around 0.3of a second.
 Repeat the test again,setting the test at 5times the rating of the RCD,the RCD must
trip faster than the last result (even though only slightly).
Measuring trip out current by varying current automatically.

26. Page 25 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825



Test

Description

Criteria

0° Test

Apply rated residual current at 0°
phase angle

RCD must trip

180° Test

Apply current at 180° phase angle

RCD must trip

½ x IΔn
Test

Half the rated current

RCD must NOT trip

1 x IΔn
Test

At rated current

Trip within 300 ms (for 30mA)

5 x IΔn
Test

High-speed test (optional)

Trip within 40 ms (for 30mA)


Acceptance Criteria
 RCD must not trip at ½ x IΔn.
 RCD must trip within required time at 1 x IΔn and 5 x IΔn.
 Measured trip current on ramp test must be within ±10% of rated value.
 Trip times must comply with:
o ≤300 ms at 1 x IΔn
o ≤40 ms at 5 x IΔn (for personal protection RCDs)

27. Page 26 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


8.9 EARTHING FOR DB & SMDB PANELS:

The scope of earthing testing involves the inspection, measurement, and verification of the
electrical resistance of an earthing system to ensure its effectiveness in safely dissipating
fault currents to the ground. This testing is critical for ensuring personnel safety,
equipment protection, and compliance with electrical safety standards.

 Tools & Equipment:
 Earth Resistance Tester (Clamp meter)
 Digital Multimeter / Continuity Tester
 Insulated Test Leads
 PPE (gloves, helmet, safety boots)
 Earth Test Record Sheet

 Procedure:

a. Preparation:
 Check physical condition of the earthing cable connected to the DB/SMDB.
 Ensure proper termination and bolting to earth bar inside the panel.
 Confirm earth continuity from DB/SMDB to the main earthing network.

b. Test Setup:
 Ensure continuous connection from DB/SMDB earth terminal to the main earth bar.
 Disconnect the earth cable at one end (either DB or main earth bar).
 Use a digital multimeter in continuity mode.
 Connect one probe at the DB earth terminal and the other at the main earth bar.
 A beeping sound or resistance reading close to 0 Ohms indicates good continuity.
 Reconnect and tighten the cable after testing.
 Confirm that panel doors, body, and internal components are bonded to the earth bar.
 Use a continuity tester from DB/SMDB earth terminal to different metal parts.

 Safety Precautions:

 Wear proper PPE.
 Do not test during lightning or wet conditions.
 Ensure area is barricaded and signposted during test.
 Avoid trip hazards from test leads.

28. Page 27 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


 Acceptance Criteria:
 Earth continuity resistance: ≤ 1 Ohm (ideally < 0.5 Ohms)
 Earth pit or system resistance: ≤ 1 Ohm (or as per design)
 All bonding should be mechanically and electrically secure.

8.10PHASE SEQUENCE TEST FOR SMDB & DB PANELS:

PURPOSE
 To verify the correct phase sequence (rotation) of a three-phase power supply before
energizing any equipment.
 Ensures motors and rotating equipment operate in the intended direction.

SCOPE
 Applicable to all three-phase power supply points including panels, distribution boards, motor
control centers (MCCs), and terminal points of motors.
SAFETY PRECAUTIONS
 Ensure the area is safe and free from hazards.
 Confirm that the electrical supply is isolated before connecting test instruments.
 All terminations and connections must be complete and secure.
 Ensure Lockout-Tagout (LOTO) procedure is in place if required.
 Verify voltage rating of the system (e.g., 400V, 415V, etc.).
Test Procedure
 Energize the system (with proper safety precautions).
 Connect phase sequence tester to the three-phase terminals (L1, L2, L3).
 Observe the indicator:
o Correct Sequence (Clockwise): Typically shown as R-S-T or L1-L2-L3
o Incorrect Sequence (Counterclockwise): Indicated as R-T-S or L1-L3-L2
 If incorrect sequence is found, switch any two of the three-phase wires and re-test.
 Once correct phase sequence is confirmed, record the result.
Acceptance Criteria
 The phase sequence must match the standard rotation (e.g., clockwise for motors).
 Results must be within system voltage tolerances.
 No abnormal indications on the phase sequence tester

29. Page 28 of 28
PROJECT Yas Water World
LOCATION
Abu Dhabi


CLIENT M/s. MIRAL
DATE
15-08-2025
CONSULTANT
M/s. TUV
MAIN CONTRACTOR
M/s. Enova

SUBCONTRACTOR
M/s. Gulf Power Electromechanical
Contracting LLC

DOC REF

GP/ENO/15825


9.Attachments
HSE RISK ASSESSMENT