High Voltage Isolation

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HIGH VOLTAGE ISOLATION ANDACCESS STANDARD

YHSS066

The electronic version is current, or when printed and stamped with the green controlled document stamp.All other copies are uncontrolled.

Published Date: 07 October 2012 Rev: 1.2 Next Review Date: 31 October 2014 Page 1 of 14

DOCUMENT INFORMATION

Description Requirements for isolation and access to high voltage equipment.

Document Owner Electrical Engineering Manager

DOCUMENT HISTORY and APPROVAL

Rev Date Revision Description Originator Reviewed Approved

1.2 30 June 2012Training section updated toalign with YHSS051 Electrical

Safety Management Standrad

Philip DeboerPhilip

Deboer

Dave

Moloney

CONTENTS

1. INTRODUCTION ............................................................................................ 21.1 Context ...................................................................................................................................... 21.2 Scope ........................................................................................................................................ 2

2.

ACCOUNTABILITIES .................................................................................... 2

3. DEFINITIONS ................................................................................................. 24. PROCESS ...................................................................................................... 44.1 General safety ........................................................................................................................... 44.2 High Voltage Switching ............................................................................................................. 64.3 Isolation and Access ................................................................................................................. 84.4 High Voltage Motors and Electrostatic Precipitators............................................................... 125. TRAINING .................................................................................................... 135.1 Authorisation levels ................................................................................................................. 135.2 Training and assessment ........................................................................................................ 136. RECORDS .................................................................................................... 137. APPENDICES .............................................................................................. 138. RELATED DOCUMENTS ............................................................................. 14


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1. INTRODUCTION

1.1 ContextThe purpose of this document is to describe the procedures required to provide a safeworking environment for all persons accessing the QN power distribution system.

This procedure is based on the Electrical Safety Office Code of Practice and TheQueensland Electrical Entity Procedures for Safe Access to High Voltage Apparatus2010.

Any variation from this procedure for operational reasons shall be under authorisationof the Electrical Engineering Superintendent, but maintaining compliance with theElectrical Safety Office Code of Practice and The Queensland Electrical EntityProcedures for Safe Access to High Voltage Apparatus 2010.

1.2 ScopeThe scope of this procedure covers high and low voltage equipment forming part of theQN power distribution network. For the purpose of switching operations, operation oflow voltage apparatus is also part of the scope of this procedure.

Application of this procedure shall also apply for other high voltage equipment such aselectrostatic precipitators and high voltage electric motors.

2. ACCOUNTABILITIES

Electrical Engineering Manager

Responsibility for managing compliance with this procedure.

All personnel

Responsible for compliance with this procedure.

3. DEFINITIONS

TERM DEFINITION

High Voltage (HV) A voltage source in excess of 1000 Volts AC or 1500 Volts DC.

High Voltage ClearanceCertificateAccessPermit

A document that forms part of a safe system to work, to provideelectrically safe access to High Voltage Electrical Apparatus.Referred to as Access Permit

High Voltage ClearanceCertificateTest Permit

A documented form of authorization that allows an individual ofa Work Group to access High Voltage electrical lines andapparatus for testing and removal of operator earths inaccordance with stated conditions of isolation andearthing.Referred to as Test Permit

High Voltage SwitchingCo-ordinator

Person(s) nominated by the Electrical Superintendent to ascompetent to perform the role of High Voltage SwitchingCoordinator as prescribed in this procedure.


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TERM DEFINITION

High Voltage SwitchingOperators Lock

A series lock, coloured blue and marked with the words HighVoltage, placed on a HV Lock Box by a High Voltage Switching

Operator to control an isolationHigh Voltage SwitchingOperator

A person who is authorised and nominated to perform highvoltage switching for the issue of an access or Test Permit.

HV Lock BoxA lockout box

1 that has been coloured blue to identify it for the

purposes of HV isolation.

HV Lock Box LockA job specific lock belonging to a HV lock box used for HVisolation.

LiveHaving a potential difference between conductors, to earth or tonon-electrical parts.

Low Voltage A voltage not exceeding 1000 Volts AC or 1500 Volts DC.

Operating StickA specifically designed and approved insulated rod used toprovide a means of direct access to high voltage lines andapparatus from outside the exclusion zone.

Operator EarthEarths and short circuit of an approved type and size applied asan operation in a Switching Sheet.

Portable Earthing Device(PED)

Portable earthing equipment of approved type and size used toearth parts of a circuit where an earthing switch is not available.

Power distributionsystem (PWR)

The system of power distribution at QN (11kV, 3.3kV and415V), generally down to the transformer incomers and busties. The extent of the PWR is generally considered to beapparatus denoted on 540-0001-028 QN Power System

Distribution Network Single Line Diagram. The 514 11kValternators and utility supply are considered to be part of thePWR.

RecipientA person who is authorised and nominated to be a Recipient ofan access or Test Permit.

SwitchingThe operation of switchgear, isolators, fuses or earthingdevices.

SubstationA system of switchgear and / or power transformers andassociated equipment, enclosures or structures.

Substation Switch room A switch room being part of a substation.

Substation yard An outdoor enclosure for switchgear and / or powertransformers.

Switching Assistant

A person who is authorized and nominated to check highvoltage switching operations for the issue of an access or TestPermit.

Switching SheetAn approved document that has a unique identifying number,listing operations of switching in a step by step process

Switching Sheet WriterAn authorized person who writes a Switching Sheet as requiredin this procedure.

Switching Sheet Checker

An authorized person who verifies that a Switching Sheet is

correct.

1Refer also to YHSS047 - Permit to Work and Isolation for job-specific locks and lockoutbox definitions.


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TERM DEFINITION

Switch roomAn indoor enclosure specifically for a switchboard (e.g. MCCs)or switchgear.

Switchyard See Substation yard

Work GroupPersons signed on to an Access or Test Permit, to approach orwork on HV electrical lines and apparatus in accordance withstated conditions of isolation and earthing.

Work AreaThe work area under the control of an issued Access Permit orTest Permit.

Working EarthsEarths and short circuit applied by an Individual of a WorkGroup at the Work Area under the supervision of a Recipient.

4. PROCESS

4.1 General safety

4.1.1 Controlled areas

No person shall enter a switchyard or outdoor substation unless they are appropriatelytrained to this procedure, or under supervision of a person authorised to this procedure.

Access to substations is controlled as follows:

Substation Area Key Authorisation

Substation switch roomSwitch room (MCC)key

Electrical worker orOtherwise trained and authorized.

Substation yard or HVequipment enclosure

HV Operators keyHigh Voltage Switching Operatorauthorization to this procedure

Reactor yard Reactor yard keyHV Switching Coordinator(entry under Access Permit only)

Access to other switch rooms and equipment rooms is outside the scope of thisprocedure.

Any work that may cause an incursion into the exclusion zone, other than work thatwould be subject to this procedure, is subject to YHSS067 Overhead Power LineExclusion Zone Standard.

4.1.2 Work instructions

Operation of any high voltage apparatus, low voltage substation air circuit breakers ortesting of high voltage conductors shall be performed in accordance with YHSS066fCritical Switching Instructions.

When an abnormality in high voltage equipment operation is encountered, the workshall be considered to be outside the scope of the YHSS066f Critical SwitchingInstructions, and shall be specifically risk assessed accordingly.

4.1.3 PPE

Every person who intends to operate locally or is otherwise in close proximity to highvoltage apparatus as well as substation low voltage circuit breakers must wear PPE asa control measure against electric shock and ARC flash. PPE requirements for


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operating specific apparatus are specified in the relevant work instruction for thatapparatus. As a minimum, ARC flash category 0 Natural fiber (cotton/wool) longsleeve shirt & pants, safety glasses, hard hat and leather gloves. Shirts shall be fully

buttoned up at the wrists and neck.Insulating gloves used for protection against an electric shock hazard shall be:

Tested for insulation at least every six months;

Labeled to indicate that it is within the test period.

In good repair and condition; and

Visually inspected and air tested before each use

4.1.4 Operating and Test Equipment

Operating equipment for use on high voltage apparatus shall only be used if it is:

Tested for insulation at least every six months;

Labeled to indicate that it is within the test period

In good repair and condition; and

Visually inspected before each use

High Voltage test equipment shall be

Fit for purpose and rated to the operating voltage of the conductor to be tested

Tested every six months with the test date marked on it

Tested for operation immediately prior to each use.

Portable earthing devices shall be

Rated to the prospective fault current of the conductors to be earthed.

All conductors shall be tested for dead prior to placing portable earthing devices.

The earth mat or earth stake connection shall be made first.

4.1.5 Work on High Voltage Cables

High Voltage cables shall not be handled when live.

In most cases it is not possible to test, prove dead and earth a sheathed high voltage

cable close to the location where work is to be carried out on the cable.

The cable must be tested, proven dead, and earthed at each point of isolation and thenidentified at the point where the work is to be carried out, either by an approved test orby tracing it visually.

Note: Labels on cables, or drawings, must not be relied upon as a positive means ofidentification.

After identification, spiking or stabbing of the cable shall be carried out in a manner-approved by the High Voltage Switching Coordinator, at the point where the cable is tobe cut.

If spiking or stabbing of the cable is undesirable, the High Voltage Switching

Coordinator shall instruct the Recipient on the additional precautions to be taken beforethe cable is opened or cut.


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4.1.6 Work on energized equipment

Live work on high voltage conductors, other than testing live high voltage conductorswith test equipment in compliance with this procedure, is not permitted. Removal of a

panel that conceals high voltage conductors shall be considered to be the same asworking on the concealed high voltage conductors.

Work performed within a high voltage metal clad circuit breaker cubicle, other thanswitching operations covered by a work instruction, shall be risk assessed to controlarc flash hazards and potential contact with high voltage conductors. Any workcreating a potentially ionizing atmosphere (any dust or gas) should not be performedon energized equipment.

In determining the extent of the exclusion zone for overhead high voltage conductors aHigh Voltage Switching Operator may be considered to be an Instructed person inaccordance with Schedule 2 of the Electrical Safety Regulation.

Oil sampling on energized oil-filled transformers is permitted only if valves have beenfitted for this purpose. Removal of valves or cracking of bungs is not permitted.

4.1.1 Lightning

Work on or around overhead power lines while thunderstorms are in the vicinity should be riskassessed.

4.1.2 Resetting protection relays

Resetting protection relays for high voltage equipment should only be performed by aHigh Voltage Switching Operator or an electrical worker who is competent to do so.

Protection relay settings shall not be adjusted or otherwise changed, unless performedunder the appropriate change management procedures.

4.1.3 Emergency response

In any emergency situation, the emergency response crew should be mobilised.

All personnel should be evacuated immediately from any sustained electrical fault,equipment fire or fallen power lines until the equipment has been isolated and madesafe.

Emergency response personnel should contact the power station to switch off powerfrom its source if trained personnel are unavailable to perform any necessary switchinglocally.

4.2 High Voltage Switching

4.2.1 High Voltage Switching Coordinator

Any high voltage switching operations that would require a Switching Sheet to perform shouldbe authorized by the High Voltage Switching Coordinator. Where the High Voltage SwitchingCoordinator is not on site, a verbal authorisation may be sufficient provided a record of theauthorization is made on the Switching Sheet.

4.2.2 Remote operational switching

Remote operation of any high voltage switching device by an appropriately trainedplant operator is considered operational switching. Remote operational switching doesnot require a Switching Sheet or authorized High Voltage Switching Operator.

4.2.3 Local operational switching

Local operation of any high voltage switching device, being part of the powerdistribution system shall be performed by a HV Switching Operator, authorized to thisprocedure.


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A high voltage Switching Sheet should be used for multiple or sequential switchingoperations. Refer to Appendix 2YHSS066b High Voltage Switching Sheet Template.

4.2.4 Normally open points

Normally open points on the power distribution system are designated open points onany ring-feed system. These are marked on the QN Refinery Power SystemDistribution Network Single Line Diagram

Operation of normally open points may affect the protection characteristics of the circuitand should be performed only under the direction of the High Voltage SwitchingCoordinator.

(Generally, all lines and apparatus being part of the QN Refinery Power SystemDistribution Network should be left in an energized state.)

4.2.5 Switching for high voltage isolation and access

4.2.5.1 Switching Sheet for high voltage isolation and accessThe Switching Sheet Writer shall ensure that a Switching Sheet, as part of the issue ofan Access Permit, renders the equipment to be accessed to be effectively isolated andearthed upon issue of the Access Permit.

The Switching Sheet Checker shall verify that the Switching Sheet complies with therequirement of this procedure.

The Switching Sheet Writer and the Switching Sheet Checker shall not be the sameperson.

4.2.5.2 Effective isolation

Effective isolation of electrical equipment for access purposes is achieved when it is

ddisconnected from all possible sources of energy by means that prevent unintentionalenergisation of the Electrical Apparatus and that are assessed as a suitable step in theprocess of making safe.

An effective point of isolation shall include an adequate break that prevents anyinadvertent energisation, for example from lightning, switching or back energisation.

Each point of isolation shall be locked with a HV lock box lock and tagged with a HVaccess tag.

4.2.5.3 Effective earthing (operator earths)

High voltage conductors shall be considered to be effectively earthed when electricallyconnected to the general mass of earth by approved earthing devices applied for the

earthing and short-circuiting of high voltage conductors.High voltage conductors are noteffectively earthed when failure to achieve or maintaineffective isolation from all sources of supply renders any of the high voltage conductorssusceptible to become live.

Every point of earthing shall have an access tag attached to it.

4.2.5.4 Switching operations for high voltage isolation and access

Operation of any switching device for purposes of isolation and access within the scopeof this procedure shall be performed by a High Voltage Switching Operator, authorizedto this procedure.

The High Voltage Switching Operator shall be accompanied at all times, by a

Switching Assistant, while switching operations are being carried out. The SwitchingAssistant shall verify every switching operation performed by the High VoltageSwitching Operator.


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Every operation shall be in accordance with the high voltage Switching Sheet. Eachoperation on the Switching Sheet shall be carried out in accordance with the workinstruction as per described in section 4.1.2.

The High Voltage Switching Operator shall not deviate from a Switching Sheet writtenfor high voltage isolation and access. If there are any perceived errors in the SwitchingSheet, switching shall cease until clarification from the HV switching Coordinator canbe sought or the entire Switching Sheet rewritten.

4.2.5.5 Issue of an Access Permit

The issue of an Access Permit to a Recipient shall be within the limits of the AccessPermit as prescribed by the Switching Sheet Writer.

At least one set of operator earths shall be applied before an Access Permit is issued.

No point of isolation or earth placed under the conditions of issuing an Access Permitshall be removed while the Access Permit is in effect.

4.3 Isolation and Access

4.3.1 Access Permits

An Access Permit is required in all cases when any person may be within the exclusionzone of a high voltage conductor or access live parts of high voltage equipment for anyreason.

An Access Permit (see Appendix 3 YHSS066c High Voltage Clearance Certificate -Access Permit) shall be accompanied by a Switching Sheet.

Equipment that would not become live such as completely withdrawn circuit breaker

trucks and plant decommissioned or under construction may be exempt from thisclause.

4.3.1.1 Issuing Access Permit to Recipient

The High Voltage Switching Operator shall ensure that;

The high voltage conductors detailed under the conditions of the Access Permit, asissued to the Recipient, have been effectively isolated and earthed in accordancewith the Switching Sheet;

The Access Permit work area, in particular the equipment that has been isolated, isappropriately demarcated within the limits of the Access Permit and the Recipienthas been instructed on the limits of the Access Permit.

No Recipient shall accept an Access Permit unless they fully understand the limits of

the Access Permit.

Only High Voltage Switching Operator s shall issue and cancel Access Permits.

Only Recipients shall accept and surrender Access Permits.

The High Voltage Switching Operator and the Recipient shall not be the same personon an Access Permit.

4.3.1.2 High Voltage Switching Operators lock

Upon issue of an Access Permit, the High Voltage Switching Operator shall place aHigh Voltage Switching Operators lock on the HV lock box. The High VoltageSwitching Operators lock shall only be removed by the High Voltage Switching

Operator upon cancellation of an Access Permit or under the control of a Test Permit.4.3.1.3 Final test for dead

The Recipient shall ensure that a final test for dead is performed by an operator prior toany work being done under the Access Permit. If a test for dead with a test instrument


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is not possible, then another method, as approved by the High Voltage SwitchingCoordinator, shall be used.

4.3.1.4 Work under an access permit

Any person working under an Access Permit (Work Group) shall sign onto the AccessPermit and place their personal lock on the HV lock box under the direction of theRecipient.

The Recipient shall be responsible for ensuring that the Work Group Members sign offand removes their personal lock from the HV lock box.

If the Work Group signature section of the Access Permit becomes full, the Recipientshall attach another Access Permit and make cross-references to the Access Permitnumbers.

Any Work Group Member who has signed off the Access Permit shall not re-enter thework area (equipment under control of the Access Permit).

A Work Group Member may only leave the work area for a short period while work is inprogress without signing off, provided that:-

the Recipient is advised before leaving, and

Access Permit conditions are not likely to change during the personsabsence, and

the Access Permit is not intended to be surrendered / suspended during thepersons absence

The Work Group Member reports to the Recipient on returning to the Work Area toensure that Access Permit conditions have not altered in all other circumstances,the person shall sign off the Access Permit.

Work performed under the Access Permit may include testing, providing such tests donot require the removal of operator earths or produce Lethal Current.

4.3.1.5 Working earths

The Recipient shall ensure that working earths are placed, as soon as possible, toprotect against any potential electrical hazard that may occur on the HV conductorswithin the boundary of the issued Access Permit. Potential electrical hazards mayoccur downstream from where operator earths have been placed from unidentifiedsources such as

Single feed 3.3kV switchboards that have no earth facility (310,410 and 420 GECMCC) and associated transformer secondary and NER.

The 11kV overhead reticulation system (where breaks in the line may occurs duringwork).

All working earths shall only be placed or removed under the direction of the Recipientand recorded in the working earth schedule of the Access Permit. Working earths shallbe removed prior to the Access Permit being surrendered.

4.3.1.6 Transfer of Access Permit Recipient

When control of the Access Permit is to be handed over to another Recipient(transferred), the incoming Recipient shall ensure that he is familiarized with theconditions and boundaries of the Access Permit.

The incoming Recipient Shall:

Become familiar with the conditions of the Access Permit

Confirm the details of the Access Permit and the safety precautions, otherprecautions and any nearby exposed HV or LV electrical apparatus

Advise the Work Group regarding the change of Recipient


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The transfer of control of the Access Permit shall be recorded in the transfer of AccessPermit section.

4.3.1.7 Suspension of Access Permit

An Access Permit may be suspended for issue of a Test Permit. Suspension shall onlyoccur once. The Test Permit number shall be recorded on the suspension of AccessPermit for testing section of the Access Permit.

The Recipient shall ensure that every member of the Work Group has signed off theAccess Permit and removed their personal locks from the HV lock box, before anAccess Permit may be suspended.

4.3.1.8 Reinstatement of an Access Permit

The Work Group shall not sign onto the Access Permit until the Recipient hasconfirmed that there are no alterations or modifications to the conditions of work underthe original Access Permit, ensured the recording of the time of suspension and re-

instatement. The Access Permit can now be re-instated by completing the permit re-instated section of the Access Permit.

The Access Permit shall not be reinstated until the accompanying Test Permit hasbeen cancelled.

4.3.1.9 Surrender of Access Permit

The Recipient may surrender the Access Permit when the Access Permit is no longerrequired.

An Access Permit shall only be surrendered when;

The Access Permit is not suspended

Any operator earths removed are re-instated All working earths have been removed.

The Work Group has signed off the Access Permit.

The Recipient has visually inspected the work site to check that no unsafe conditionexists.

4.3.1.10 Cancellation of the Access Permit

The High Voltage Switching Operator shall only cancel an Access Permit after theRecipient has surrendered it.

When an Access Permit has been cancelled the same Access Permit shall not be re-issued.

It is the responsibility of the High Voltage Switching Operator to remove any work areabarriers or the like placed as part of the condition of issuing the Access Permit to theRecipient.

4.3.1.11 Failure to remove personal lock

If a Work Group Member has failed to remove his personal lock from the HV lock box,then follow the requirements of YHSS047 - Permit of Work and Isolation.

4.3.2 High Voltage Test Permits

A Test Permit is required where a working party has access to high voltage apparatus,and the operator earths need to be removed or lethal currents may be produced, duringtesting of the high voltage apparatus. Refer to Appendix 4 YHSS066d High Voltage

Clearance CertificateTest Permit.

A Test Permit shall be issued after suspension of an Access Permit. The SwitchingSheet number shall be referenced on the Test Permit.

Only High Voltage Switching Operators shall issue and cancel Test Permits.


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The issuing High Voltage Switching Operator and Recipient shall not be the sameperson on a Test Permit.

Only recipients shall accept Test Permits and shall fully understand the work beingperformed under the Test Permit.

All operations and testing performed under a Test Permit shall be in accordance withthe relevant work instruction as per described in section 4.1.2.

4.3.2.1 Issuing a Test Permit to a Recipient

The High Voltage Switching Operator shall ensure that the Recipient has suspendedthe Access Permit before issuing a Test Permit to the Recipient. The Test Permitshould only remain issued for as long as the Recipient can maintain constantsupervision for the duration of the test.

4.3.2.2 Removal of operator earths for testing

Removal and replacement of operator earths for testing shall only be done under thedirection of the Test Permit Recipient, by a High Voltage Switching Operator.

Removal and reinstatement of operator earths shall be accounted for on the scheduleof operator earths section in the Test Permit. The Switching Assistant shall confirmreinstatement of operator earths by the High Voltage Switching Operator.

4.3.2.3 Work Group sign onto the Test Permit

Any person working under a Test Permit shall sign onto the Test Permit Work Groupsignatures section and remain under the supervision and direction of the Recipient.

The Recipient shall maintain constant supervision of any work performed under theTest Permit.

Any Work Group Member who leaves the work area (equipment under control of theTest Permit) shall sign off the Test Permit.

Any Work Group Member who has signed off the Test Permit shall not re-enter thearea or equipment under control of the Test Permit.

4.3.2.4 Working earths

All working earths shall only be placed or removed under the direction of the Recipientand recorded in the working earth schedule of the Test Permit.

4.3.2.5 Surrender of Test Permit

The Test Permit should be surrendered by the Recipient as soon as the testing isfinished or constant supervision of the Work Group cannot be maintained.

Prior to surrendering a Test Permit, the Recipient shall ensure that;

All operator earths have been reinstated by the High Voltage Switching Operator

All working earths placed under the Test Permit have been removed.

The Work Group has signed off the Test Permit.

The High Voltage Switching Operator has placed the High Voltage SwitchingOperator lock on the HV lock box.

If further testing is required at a later time, then a new Test Permit shall be issued bya High Voltage Switching Operator.

4.3.2.6 Cancellation of the Test Permit

The High Voltage Switching Operator shall only cancel a Test Permit after theRecipient has surrendered it.

When a Test Permit has been cancelled the same Test Permit shall not be re-issued.


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4.4 High Voltage Motors and Electrostatic PrecipitatorsThis section applies only to high voltage electric motors and electro-static precipitators,as this equipment has much simpler high voltage isolation than the power distributionsystem and is generally isolated under a system of process isolation.

4.4.1 Isolation and access

Authorized High Voltage Switching Operators and Switching Assistants as per thisstandard shall perform all isolation operations for access to HV conductors.

The Recipient of an Access Permit shall be responsible for receiving and surrenderingthe Access Permit as per the requirements of this procedure.

Any person within the barricaded or demarcated area of HV equipment under anAccess Permit shall be required to sign on to the same permit.

4.4.2 Access Permit for motors and precipitators

The issuing High Voltage Switching Operator may issue an Access Permit to the permitacceptor as the Recipient of the Access Permit.

In this case,

YHSS066e High Voltage Clearance Certificate - Access Permit for Motors andPrecipitators shall be used and

the Work Group shall sign on and off the permit to work only and

The Recipient shall maintain constant supervision of any work performed under theAccess Permit and

The Recipient must be present when there is a change in permit holder to ensurethe incoming permit holder is familiarised with the conditions of the Access Permit

This clause does not apply to Test Permits.

4.4.3 Lock boxes and locks

Where process isolation lock boxes and a HV lock box are both used together as partof a system of equipment isolation (e.g. mechanical and electrical), there shall bemeasures to maintain the integrity of the system of isolation;

The process lock box shall be the lock box that is used for placement of personallocks , and

Lock boxes are interlocked so that the HV lock box is locked by a process lock boxlock, and

The High Voltage Switching Operator has placed a High Voltage SwitchingOperators lock on the HV lock box.

4.4.4 Labeling of equipment

Equipment shall be properly labeled to ensure positive isolation. Panels or enclosurescontaining live high voltage conductors (e.g. motor terminal boxes) shall have anappropriate danger sign to warn of the hazard.


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4.4.5 Operational switching

Operational switching within the scope of this section does not require a SwitchingSheet or authorized High Voltage Switching Operator and hence may be performed by

an appropriately trained plant operator.

5. TRAINING

5.1 Authorisation levelsAuthorisation for High Voltage Switching Operators is based on demonstratedcompetency in the roles duties of Recipient, Switching Assistant and High VoltageSwitching Operator.

A High Voltage Switching Operator for motors and precipitators is authorised to

perform the duties of the Recipient, Switching Assistant and High Voltage SwitchingOperator for the issue and acceptance of clearance certificates, but is restricted to thescope of Section 4.4- High Voltage Motors and Electrostatic Precipitators

The High Voltage Switching Coordinator is a person (s) nominated or delegated by theElectrical Engineering Superintendent as competent to provide support for HighVoltage Switching Operators.

5.2 Training and assessmentTraining and assessment guidelines are outlined in;

MAMTP02-TM01-PA01 Practical assessment High Voltage Switching Operator forPower Distribution

MAMTP02-TM01-PA02 Practical assessment High Voltage Switching Operator forMotors and Precipitators

6. RECORDS

Upon completion of any work relevant to this standard, completed Switching Sheetsand clearance certificates shall be attached to the permit to work and archived inaccordance with YHSS047 Permit to Work & Isolation Standard.

7. APPENDICES

Appendix Details

1 YHSS066a Guidelines For Writing Switching Sheet

2 YHSS066b High Voltage Switching Sheet Template

3 YHSS066c High Voltage Clearance CertificateAccess Permit

4 YHSS066d High Voltage Clearance CertificateTest Permit

5

YHSS066e High Voltage Clearance Certificate - Access Permit for Motors

and Precipitators

6 YHSS066f Critical Switching Instructions


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8. RELATED DOCUMENTS

Origin Details

QueenslandNickel

YHSS051 Electrical Safety Management

YHSS067 Overhead Power Line Exclusion Zone Standard

YHSS047 Permit To Work & Isolation Standard

YCPS010 Change Management Standard

QN Power System Distribution Network Single Line Diagram (540-00001-00028)

MAMTP02-TM01-PA01 Practical assessmentHigh Voltage SwitchingOperator for Power Distribution

MAMTP02-TM01-PA02 Practical assessmentHigh Voltage SwitchingOperator for Motors and Precipitators

QueenslandGovernment

Electrical Safety Act 2002

Electrical Safety Regulations 2002

Electrical Safety Office of Queensland - Codes of practice

Queensland Electrical Entity Procedures for Safe Access to High Voltage

Apparatus 2010

AustralianStandards

N/A

High Voltage Isolation

Documents

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