Download test to prove de-energised cs-ohs-54

CS-OHS-54
(AMD 05/12)
CS ENERGY PROCEDURE FOR
TEST TO PROVE DE-ENERGISED
CS-OHS-54
Responsible Officer:
Group Manager Health and Safety / Health and Safety Advisor - Electrical
Responsible Executive: Executive General Manager Corporate
DOC UME NT HIS T OR Y
Key Changes
New Procedure
Prepared By
C. Kendrick-Ward
Checked By
Electrical Safety Taskforce
B/D/12/768 – CS-OHS-54 – TEST TO PROVE DE-ENERGISED
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Approved By
A. Brown
Date
14/05/2012
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CS-OHS-54
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CONTENTS
DOC UME NT HIS T OR Y ............................................................................................................................ 1
1
PURPOSE ..................................................................................................................................... 3
2
SCOPE.......................................................................................................................................... 3
3
RESPONSIBILITIES AND ACCOUNTABILITIES ......................................................................... 3
3.1
CS Energy .....................................................................................................................................3
3.2
Group Health and Safety Manager ................................................................................................ 3
3.3
Power Station Manager ................................................................................................................. 4
3.4
Authorised Electrical Person/s ....................................................................................................... 4
4
F UNC T IONAL F L OWC HAR T ....................................................................................................... 5
5
HAZAR DS ..................................................................................................................................... 6
6
R IS K AS S E S S ME NT .................................................................................................................... 6
7
C ONT R OL S .................................................................................................................................. 6
7.1
General Testing to Prove De-Energised Requirements ................................................................. 6
7.2
For Low Voltage ............................................................................................................................ 8
7.3
For High Voltage............................................................................................................................ 8
7.4
Suitable Voltage Testing Devices .................................................................................................. 9
7.5
Low Voltage Contingent Testing .................................................................................................... 9
7.6
Managing Induced Voltages ........................................................................................................ 10
8
F UNC T IONAL F L OWC HAR T S ................................................................................................... 11
9
T R AINING AND C OMP E T E NC Y ................................................................................................ 13
10
R E V IE W ...................................................................................................................................... 13
11
DEFINITIONS.............................................................................................................................. 13
12
REFERENCES ............................................................................................................................ 18
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1
PURPOSE
To describe CS Energy’s requirements relating to electrical testing to prove de-energised.
2
SCOPE
This procedure applies to electrical testing to prove de-energised practices undertaken as part of
isolations performed on low voltage and high voltage circuits to allow the performance of electrical work
across all CS Energy operated and/or maintained sites.
3
RESPONSIBILITIES AND ACCOUNTABILITIES
3.1
C S E nergy
CS Energy shall be responsible for:
•
3.2
Having a documented isolation and access procedure.
G roup Health and S afety Manager
Group Health and Safety Manager is responsible for ensuring that:
•
Ensuring all persons who are involved in the test for de-energised procedures have been trained
and assessed as competent to perform the roles for which they are responsible, and authorised.
•
Maintaining a register of all authorised persons with details of any restrictions.
•
Ensuring audits of the PTW system are carried out.
•
Maintaining the Register of Authorised personnel.
•
Enforcing compliance with this procedure.
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3.3
P ower S tation Manager
The Power Station Manager is responsible to:
•
Monitor the implementation of the Electrical Safety Corporate Standard
•
Allocate responsibilities and resources to ensure specific practices/procedures are developed to
satisfy the Corporate Standard.
These responsibilities may be delegated from time to time when the person fulfilling this role is
unavailable.
3.4
Authoris ed E lectric al P ers on/s
Authorised Electrical Person/s are responsible for ensuring that:
• All persons who are involved in the test for de-energised procedures have to be trained and
assessed as competent to perform the roles for which they are responsible, and authorised to
perform.
•
•
Comply at all times with the requirements specified within this Corporate Standard for Electrical
Safety
Comply with any specific procedures in regards to the work they are performing.
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4
F UNC T IONAL F L OW C HAR T
LV Testing
HV Testing
If testing under a PTW, check
sheet for any specific
instructions
Will the
person access an
area within the PPE
Zone (ie. 50cm from a
live part) or accessing
within an arc flash
protection
boundary?
NO
If testing under a PTW,
check switching sheets for
any specific instructions
Will the
person access an
area within the
Exclusion Zone or arc
flash protection
boundary when
testing?
YES
 Authorised Electrical
Person
 Authorised Electrical
Person
 PPE
Refer to CS Energy
procedure Selection
Maintenance and Use of
Electrical Safety
Equipment and PPE CSOHS-34
 PPE:
- Insulating gloves
rated to the highest
expected voltage
applicable for the
task
CONDUCT TEST AS
PER ISOLATION
CONTROL GUIDE
PERFORM
CONTINGENCY
PROCEDURE
(Refer to Contingent
Testing in this
procedure)
YES
• HV Switching Officer
• HV Switching Assistant –
• PPE:
Refer to CS Energy procedure
Selection Maintenance and Use
of Electrical Safety Equipment
and PPE CS-OHS-34
Are the
test results less than
20VAC or 50VDC?
NO
• HV Switching Officer
• HV Switching Assistant –
• PPE:
Insulating Gloves rated to
minimum 1,000V when
using the test equipment.
Refer to CS Energy procedure
Selection Maintenance and
Use of Electrical Safety
Equipment and PPE CS-OHS34
YES
Are
induced voltages
present?
NO
NO
YES
MANAGE INDUCED
VOLTAGES
(Refer to Managing
Induced Voltages in
this procedure)
Are the
test results less than
20VAC or 50VDC?
DEENERGISATION CONFIRMED
DEENERGISATION CONFIRMED
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HAZAR DS
5
In relation to testing to prove de-energised, CSE has implemented a safe system to control risks to
health and safety arising from hazards and issues such as, but not limited to:
•
•
•
•
•
•
6
Use of non-rated equipment in classified hazardous areas;
Use of poorly maintained test instruments;
Contact with live parts;
Arc flash;
Toxic gases;
Damp environments.
R IS K AS S E S S ME NT
Hazards associated with testing to prove de-energised are to be assessed and managed as part of the
"B/D/11/36153" - S1885 - Live Electrical Work Checklist and/or genetic JSEA process.
NOTE: This form is not required if the test to prove de-energised is done as part of the isolation process
or a test before touch on de-energised and isolated electrical equipment. In this case, only an approved
JSEA for the task is required, which can be generic, and signed onto at the start of each shift
7
C ONT R OL S
7.1
G eneral T es ting to P rove De-E nergis ed R equirements
1. Before testing to prove de-energised the PTW process needs to be followed i.e.: WCA, WCD
Isolation & Restoration Sheets / Switching Sheets & Authorisation for Electrical Work,
2. On LV equipment, testing to prove de-energised is to be performed by Authorised Electrical
Persons and/or Authorised Licensed Electrical Workers.
3. On high voltage equipment, testing to prove de-energised or a method to otherwise confirm
isolation is to be performed by a HV Switching Officer & Switching Assistant at each isolation
point immediately prior to applying earths
4. For work on electrical equipment or circuits, it is important to ensure that the correct point of
isolation is identified, an appropriate means of isolation is used and the supply cannot
inadvertently be reinstated while the work is in progress.
5. When testing to prove de-energised on LV circuits, it is important to know the type and level of
voltage being tested to ensure that sources of supply have been de-energised i.e. is it AC or DC,
Is it low voltage or extra low voltage?
6. No hand tools, other than the approved test instruments are to be used during the testing
procedure.
7. Only approved test instruments that have current test and calibration status and are registered on
a electrical equipment register are to be used
8. As a minimum Cat III, Type ‘A’ test probes are to be used for testing LV.
9. Prior to the commencement of testing, the test person is to remove all jewellery and metal objects
that are in contact with the skin or that is not covered by the Arc Flash Clothing being worn
10. Where applicable, insulating mats are to be used for working on conductive surfaces.
11. During the isolating process, each electrical isolation point must be proven to be effectively
isolated by ensuring that electrical disconnection has occurred. Proving electrical disconnection
has occurred can be completed by either:
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 On LV equipment, a test for de-energised is to be conducted at the load side of the
isolation points by an Authorised Electrical Person to prove that the isolation point is
disconnected correctly during the isolation process. (The Test Meter is to be tested on a
known power source before & after the test is carried out).
 The results of this test for de-energised are to be recorded in the WCD item column.
 Utilising a separated /visible break isolation point
Accessing incorrectly isolated equipment could result in electric shock or injury to personnel or damage
to equipment.
12. A test for de-energised must be carried out by an Authorised Electrical Worker before
commencing work on any exposed part. This test is to be carried out regardless of the method of
disconnection employed during the isolating process. This test is also to be completed at the start
of each new shift/ day.
(Test before Touch) by the Authorised Licensed Electrical Worker before commencing work and at the
start of each new shift/day.
13. Assess to the LV panel/cubicles with arc flash hazards. This can be determined by a label
indicating the potential arc flash energy or if not labelled, level 2 arc flash/shock hazard
management PPE is to be used. "B/D/11/30960" - CS-OHS-34 - Selection, Maintenance and
Use of Electrical Safety Equipment and PPE
14. Low Voltage Testing for de-energised requires normal live work precautions to be undertaken
unless the part being tested in not exposed and no arc flash hazards exist. If the equipment to be
worked on has live exposed parts, then apart from the minimal site-specific PPE, the following
PPE requirements apply refer to "B/D/11/30960" - CS-OHS-34 - Selection, Maintenance and Use
of Electrical Safety Equipment and PPE
15. If the LV equipment to be worked on has live exposed parts, then apart from the minimal sitespecific PPE, work specific PPE, barriers and safety observers are required.
16. Proving de-energisation All electrical equipment and conductors shall be treated as energized,
until proven to be de-energized. Any voltage tests used to prove de-energisation shall be
conducted in the following sequence:
a)
b)
c)
d)
Test the voltage tester on a known voltage source for correct operation.
Test between all conductors and a known earth.
Test between all conductors.
Retest the voltage tester on a known voltage source for correct operation.
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WARNING: WHEN VOLTAGE TESTERS ARE USED TO
PROVE DE-ENERGIZATION, THEY SHALL BE TESTED FOR
CORRECT OPERATION IMMEDIATELY BEFORE USE, AND
AGAIN IMMEDIATELY AFTER USE, PARTICULARLY IF
THE TEST RESULT INDICATES ZERO VOLTAGE, TO
CONFIRM THAT THE INSTRUMENT IS STILL WORKING
CORRECTLY.
Only competent persons shall perform the tests.
WARNING: THE USE OF TESTERS THAT DETECT AN
ELECTRIC FIELD SURROUNDING AN ENERGIZED
CONDUCTOR ARE NOT SUITABLE FOR CABLES THAT
ARE SURROUNDED BY A METALLIC SCREEN, CABLES
CARRYING DIRECT CURRENT AND IN SIMILAR
CIRCUMSTANCES.
7.2
F or L ow V oltage
•
•
•
7.3
If the person(s) involved in performing the testing has any part of their body within the Exclusion
Zone of an energised exposed part or within an arc flash protection boundary, they are to wear
PPE as described in the CS Energy procedure "B/D/11/30960" - CS-OHS-34 - Selection,
Maintenance and Use of Electrical Safety Equipment and PPE.
Verification of the test to prove de-energised task is to be recorded if a test to prove de-energised
is required.
If testing to prove de-energised task cannot be performed as per this CS Energy procedure, the
Person in control of electrical equipment is to be consulted to determine an alternative test
method. Where such a method is used, this process is to be documented within the JSEA risk
assessment that relates to the work task. For example (Where mechanical interlocking ensures a
Circuit Breaker is physically racked out before operating earths on the load side can be applied
and these earths are rated for the fault current, then the verified application of these earths can
be substituted for the test to prove de-energised)
F or High V oltage
•
If the person(s) involved in performing the testing has any part of their body within the Exclusion
Zone of an energised exposed part or within an arc flash protection boundary, they are to wear
PPE as described in the CS Energy procedure "B/D/11/30960" - CS-OHS-34 - Selection,
Maintenance and Use of Electrical Safety Equipment and PPE
•
•
Verification of the test to prove de-energised task is to be recorded on the WCD item no.
If a testing to prove de-energised task cannot be performed as per this CS Energy procedure, the
Person in control of electrical equipment is to be consulted to determine an alternative test
method. Where such a method is used, this process is to be documented within the JSEA risk
assessment that relates to the work task.
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7.4
S uitable V oltage T es ting Devic es
Approved test instruments are to be inspected for damage prior to each test use.
Approved test instruments are to be tested on a test source before and after proving de-energised.
Test instruments approved for use throughout CSE as per:
AS/NZS 3100:2009
AS61010.1,
Approval and test specification – General requirements for electrical equipment
Safety Requirements for Electrical Equipment for Measurement, Control &
Laboratory Use – Part 1: General requirements.
Guide to selecting a safe multimeter
HB 187 –2006,
7.5
L ow V oltage C ontingent T es ting
NOTE: This procedure is to be performed by a CSE Authorised Licensed Electrical Worker only.
If a non-conclusive LV test result is obtained (higher than 20 volts AC or 50 volts DC) when testing to
prove de-energised, further testing is to be conducted to determine whether it is from a sustained voltage
source. The procedure for measuring sustained voltages is as follows:
The Principle behind this test is to determine if a sustained voltage remains present. Testing is
performed between each phase and earth.
1. This method can only be used when the measured voltage is:
I. 50 volts AC or lower; or
II. 120 volts DC or lower.
Note: If the voltage is greater than these, go to Step 7 below. Otherwise go to Step 2 below.
2. Connect a resistance of 20 kΩ in parallel with the voltmeter when measuring the voltage. This
resistor shall plug directly into the testing meter’s lead sockets so that no exposed parts are
introduced.
Note: This is done to place a load in the circuit to check if the source voltage is sustained at
this load.
Conductor
Multimeter
R
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3. If measuring AC voltage, the sustained voltage is above 20 volts, go to Step 5).
4. If measuring DC voltage, the sustained voltage is above 50 volts, go to Step 5).
5. If an acceptable test is not obtained then substitute the resistor connected in Step 2 with one of
3kΩ resistance and repeat the sustained voltage measurement
Note: This is again done to place a load in the circuit to check if the source voltage is
sustained at this load at this lower resistance.
6. If the sustained voltage remains above the values listed in Steps 3 and 4 then the circuit is to be
considered as not proven de-energised – go to Step 7.
7. Report any instances of circuits not being able to be proven de-energised to the Person in control
of electrical equipment immediately so that further investigation can be conducted into the cause.
7.6
Managing Induc ed V oltages
Where an induced voltage has been identified, the following process is to be used as a guide.
Testing for Induced Voltages and managing induced voltages may only be performed by CSE
Authorised Licensed Electrical Workers.
If this is part of WCD forward isolation, inductive voltage hazards must be managed before signing off
the step on the WCD.
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8
F UNC T IONAL F L OW C HAR T S
1.
3.
Electrical work is required in a
panel where induced voltage
has been confirmed as part of
the isolation process using
Contingency Testing procedure
Can the source of induction be
identified and isolated?
Consider as live until
proven de-energised
Controls/Comments
Isolate source of induction.
Add additional step to isolation and
add Danger Tag
Add the additional isolation
point/s added to the
isolation guide.
This is necessary to comply with Safe
System of Work processes
Connect earth between
wiring and known earth
point. Using correct PPE
Add additional step to isolation and
add Danger Tag
Remove wiring from
terminal and insulate
suitably to prevent contact
with anything or open knifegate (and prevent its reclosure)
Add additional step to isolation and
add Danger Tag
Include the following information in the
isolation step:
Wire ID; and
Terminal number to be reinserted in
Yes
No
2.
Can the cabling with the
induced voltage on it be isolated
further upstream of the
equipment?
Yes
No
4.
Can a temporary earth be
connected to the wiring to
remove the induced voltage?
Yes
No
5.
Can wiring be disconnected to
isolate the induction from the
equipment?
Yes
No
6.
Yes
7.
Do work and reinstate
equipment to original condition
8.
If equipment has been altered,
conduct functional checks
before surrendering permit and
re-energisation of the
equipment.
9.
Update WMS/Isolation Control
Guide if necessary for longer
term management
Confirm that the
induced voltage is no
longer present on
equipment to be
worked on.
No
Consult the site PTW administrator
before progressing.
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Electrical Switchboard Isolation - Request for door available to be opened
Operations Responsibility
Open 415V
Isolator
Test for
De-energised
Isolate
LOCK and TAG
YES
Close/ Secure
DOOR
Can the door be
CLOSED?
NO
Barricade area with WARNING TAPE and SIGNAGE
appropriate to the JSEA made between the
Electrical Worker and PTWO
ISSUE
PTW
Submit a P5 Notification to install an
internal locking device to the shaft if
the isolator
OIC to include in the JSEA the
hazards and the controls in place
with the door not able to be closed
ISSUE
PTW
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9
T R AINING AND C OMP E T E NC Y
Training as described in the Corporate Electrical Safety Standard CS-OHS-31 and CS-PTW-SOP-02
Training and Authorisation in the PTW System.
10
R E V IE W
This procedure will be reviewed every three years or as necessary due to changes in legislation by the
Corporate Electrical Safety Committee.
11
DEFINITIONS
Term
AC
Arc Flash
Arc Flash
Protection
Boundary
Arc Rated Clothing
ATPV
Authorised
Electrical Person
Authorised
Licensed Electrical
Worker
Competent
DC
De-commissioned
plant
De-energise
De-energised
Definition
Alternating current.
Arc Flash is the result of a rapid release of energy due to an arcing fault
between a phase bus bar and another phase bus bar, neutral or a ground.
During an arc fault the air is the conductor. As a consequence, a person in
proximity to such an arc flash can be injured. This rapid release of energy can
be accompanied by a blast.
An approach limit at a distance from live parts that are uninsulated or exposed
within which a person could receive a second degree burn. (IEEE1584:2002
Clause 3.13).
Means clothing that has an ATPV rating.
Means Arc Thermal Performance Value. A reported value from electric arc
testing. This value is presented in calories per square centimetre and
represents the maximum capability for arc-flash protection of a particular
garment, fabric or item of arc flash PPE.
A person with the knowledge and skills enabling that person to perform work
on or near a low voltage exposed live part. Authorised Electrical Persons must
successfully complete and be current in the following training modules:
Authorised Electrical Persons and Electrical Safety Observers, Rescue from
Low Voltage Equipment and Resuscitation.
A person who is the holder of a Queensland electrical workers license (or
equivalent). Authorised Licensed Electrical Workers must successfully
complete and be current in the following training modules: Queensland
Electrical Work licence or equivalent, Electrical Safety Observers, Specific
Requirements for Electrical Work, Rescue from Low Voltage Equipment and
Resuscitation.
Having acquired the knowledge and skills enabling that person to perform the
task required, in a safe and effective manner. For example, for undertaking
electrical work the person is a Licensed Electrical Worker and has undertaken
specific CSE Electrical Authorisation Training.
Direct current.
Plant that has been permanently removed from service and had all energy
sources removed.
The process of disconnecting lines or apparatus from all conducting sources of
electrical energy.
Disconnected from all conducting sources of electrical energy but may be
energised by capacitive charge or induction.
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Term
Definition
Designated area
A clearly identified area for which a risk assessment has been undertaken and
approval has been received from the HV OIC stating the area is safe to carry
out normal high voltage work.
Direct contact
Means a person is in direct contact with an electrical part if:
• The person is touching the electrical part with the person’s bare hands
or another bare part of the person’s body, or
• The person is touching a conductive object with a bare part of the
person’s body and the conductive object is touching the electrical part,
or
• An article of clothing worn by the person is touching the electrical part,
or
• An article of clothing worn by the person is touching a conductive object
and the conductive object is touching the electrical part.
•
•
Operating plant is in direct contact with an electrical part if:
Any part of the operating plant is touching the electrical part, or
Anything the operating plant is handling is touching the electrical part.
A vehicle is in direct contact with an electrical part if:
Any part of the vehicle is touching the electrical part, or
Anything being carried or otherwise handled by the vehicle is touching
the electrical part.
Having been connected to the general mass of earth in such a manner as to
remove any residual electrical energy in a conductor or conducting object.
Means that the parts are not connected to an electrical source. Disconnection
may be achieved by de-energising, isolating, separating or breaking
connections, or through all of these methods. A part that is disconnected may
still require discharging to remove all electric and other energy.
Any apparatus, appliance, cable, conductor, fitting, insulator, material, meter or
wire:
• Used for controlling, generating, supplying, transforming or transmitting
electricity at a voltage greater than extra low voltage:
• Operated by electricity at a voltage greater than extra low voltage;
• That is or forms part of, a cathodic protection system.
CS Energy
Individual labelling of lines and apparatus to provide positive identification
during switching operations.
•
•
Discharged
Disconnected
Electrical
Equipment
Employer
Equipment
Designation
Exclusion Zone
Exclusion Zones
For a person for an electrical part, or for operating plant or a vehicle for an
electrical part, means the safe distance from the part stated for the person,
plant or vehicle.
Exclusion Zones to exposed HV conductors or articles are defined for
authorised electrical workers and Instructed persons in Schedule 2 of the
Queensland Electrical Safety Regulations 2010 and Code of Practice Working
Near Exposed Live Parts. See Section 12.3 Attachment 3
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Term
Extra Low Voltage
(ELV)
Flame Retardant
Clothing
High Voltage (HV)
High Voltage
System
Induced Voltage
Isolated
Isolation
Isolation Lock
(Red)
Isolation Point
Isolator
Instructed person
Lethal Current
Lines and
Apparatus
Low Voltage (LV)
Ω
Multiple Feeds
Non-commissioned
/De-commissioned
On or near
Definition
Means voltage of 50V or less AC RMS, or 120V or less ripple-free DC.
Clothing that has properties which suppress or delay the combustion or
propagation of flame.
Voltage in excess of 1000V AC or 1500V
The HV system includes all lines and apparatus normally energised at high
voltage. For the purposes of HV isolation, the HV system shall extend to LV
isolation point(s) where necessary. For Rectiformers, from the diodes to the DC
isolators are part of the HV system.
A voltage due to electromagnetic or capacitive coupling that may be present in
an isolated conductor if it is located near to or run in parallel with an energised
conductor.
Disconnected from all possible sources of supply and rendered incapable of
being made live without premeditated and deliberate operation.
The process of disconnecting high voltage lines and apparatus from all sources
of high voltage supply by isolation points. The process of separating all sources
of energy from an item of plant.
Individually keyed and numbered locks that are used to lock High Voltage
Isolation Points and Operator Earths.
A suitable means of disconnection that is open to allow access and having an
isolation Lock and tag.
A device, when in the open position, is capable of preventing accidental
energisation by lightning or switching surge
For an electrical part, means a person who is acting under the supervision of
an authorised person for the electrical part.
Current in excess of 10mA alternating current or 300 mA direct current through
the human body as specified in Australian Standard AS60479.1-2010 Effects of
current on human beings and livestock.
Those parts of any conductor or articles, such as underground cables,
overhead lines or electrical plant and equipment, which are normally energised
at a high voltage.
Voltage greater than extra low voltage, but not more than 1000V AC RMS or
1500V ripple-free DC. (50V AC to 1000V AC, and 120V ripple-free DC to
1500V ripple-free DC)
Symbol representing ohms, a unit of measure of electrical resistance.
There is more than one source of power to that equipment
Lines and apparatus which cannot be energised by a normal switching
operation.
A situation where an electrical worker is working on or near exposed energised
conductors or live conductive parts and there is a reasonable possibility that
the electrical worker’s body, or any conducting medium the electrical worker
may be carrying or touching during the course of the work, may come closer to
the exposed energised conductors or live conductive parts than 500mm. The
term ‘on or near exposed energised conductors or live conductive parts’ does
not apply if the uninsulated and energised part is safely and securely shielded
be design, or segregated and protected with barricades or insulated shrouding
or insulating material to prevent inadvertent or direct contact.
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CS-OHS-54
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Term
Person in Control
Phasing Out (or
Phased)
Plant
PPE
PTW
(Permit to Work)
PTW board
PTWO – PTW
Officer
Safety Barrier
Safety Observer Electrical
Definition
The person who is in control of the electrical equipment at a particular location.
For CSE this is the site manager.
A Test to determine whether energised conductors are the same polarity and
may be satisfactorily connected.
Plant is any:
• installations, equipment and pressure vessels directly involved in
electricity generation,
• fixed installations, equipment and machinery,
• a component of plant, and
• A fitting, connection, accessory or adjunct to plant.
(This includes any plant hard-wired, permanently piped or physically
connected to an energy source.)
Personal protective equipment
A PTW is an authorisation, on the prescribed form, giving approval for work on
specified equipment. The three accepted types of PTW allowable under the CS
Energy PTW System are:• PTW – Issued for Work
• PTW – Issued for Test
• PTW – Issued for Access
A lockable board that:
• is used to house all isolation and PTW documentation once the PTW is
issued,
• is used to secure the key(s) of a PTWO lock once isolations have been
made and locked out, and
• is capable of having an OIC lock and personal locks attached to it to
secure access to the PTWO key(s)
The PTWO is an authorised person who has successfully completed all
appropriate PTW training and is deemed competent to isolate the plant and
issue a PTW allowing work to safely proceed, then on return close the PTW
and restore the plant.
Suitable barriers or earthed metal shields installed between the person and the
conductors or electrical articles.
A suitably trained and competent person who is authorised to observes
individuals of a Work Group to ensure compliance with safety precautions.
A Safety Observer – Electrical Shall:
• Have an electrical work licence.
• Be competent in rescue from electrical equipment
• Be competent in resuscitation techniques
• Competent to perform the task they are to observe
• Be assessed in the last 6 months to be competent to rescue a person
performing electrical work and provide resuscitation.
• Know where all isolation points are located and how to operate them for
the work being performed.
• In addition, Safety Observers – Electrical are to receive specific
instructions in their duties from the Switching Officer and/or OIC on
each occasion
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CS-OHS-54
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Term
Definition
Separated Isolation
Point
Isolation point where two electrical conductors have been physically separated
by racking out the switchboard load from the supply in accordance with
manufacture’s guidelines. Additionally, a visible break between a load and a
supply can be deemed a separated isolation point (eg. Removed Fuse)
Indicates that a statement is mandatory
Indicates a recommendation
There is only one primary feed of supply to the equipment being isolated –
415V or 6.6KV motor supply. Heater and other control supplies are considered
secondary supplies.
A SPTWO coordinates the day to day requirements of the PTW System.
Shall
Should
Single primary
Feed
SPTWO (Senior
PTW Officer)
Standard Test
Finger
Supervise
(electrical work)
Substation
Test Before
Touching
Test to Prove Deenergised
Test Tag
A device used to determine minimum clearances around electrical parts as per
the dimensions set out in the IEC Standard 61010
Means technical supervision of electrical work to ensure the requested scope is
completed.
Any location where HV supply is converted, transformed or switched.
An electrical test performed by an Authorised Licensed Electrical Worker
immediately prior to working on a de-energised electrical part.
A process that involves the testing of electrical circuitry with a voltage
measurement device to determine the electrical status, and confirm that the
circuitry is de-energised as a result of isolation protocols.
A notice in the form of a blue tag that:
•
•
•
•
•
Untrained person
(electrical part)
WCA (Application
for PTW)
Is fixed to points of control for running a test or introducing a hazardous
energy source;
Provides warning and information to persons involved in plant isolation,
access, inspection, maintenance and repair;
Identifies a step number corresponding to the associated PTW issued
for Test;
Signifies that the point of control is not to be interfered with or operated
under any circumstances unless authorisation is given by the HV OIC;
Must only be hung or removed by a PTWO.
Means a person who is not an authorised person or an instructed person for
the electrical part.
An electronically generated form specifying the plant item and scope of work.
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CS-OHS-54
(AMD 05/12)
Term
Definition
Work Area
The lines and apparatus to which access for work/testing has been given,
defined by a tape or rope barrier.
WORK
AREA
Work Group / Work
party
WCD
12
All persons who perform specific work activities as coordinated by an OIC.
Work clearance document that provides the identification and operations to be
performed in carrying out plant isolation. (Also commonly known as an
isolation/restoration sheet)
REFERENCES
Reference No
"B/D/11/30957"
"B/D/12/11085"
IN DRAFT
"B/D/11/19583"
"B/D/11/30960"
"B/D/11/36153"
"B/D/10/21585"
"B/D/12/7104"
Reference Title
Queensland Electrical Safety Act 2002
Queensland Electrical Safety Regulations 2002
Queensland Electrical Safety Code of Practice – Working Near
Exposed Live Parts 2010
Queensland Electrical Safety Code of Practice – Electrical Work
2010
Queensland Electrical Safety Code of Practice – Risk Management
2010
Queensland Electrical Safety Code of Practice – Work 2010
Queensland Electricity Entity Procedures for Safe Access to High
Voltage Electrical Apparatus (Orange Book)
CS-OHS-31 - Electrical Safety Management
CS-OHS-36 - Barricades & Signage
CS-OHS-57 - Isolation of Electrical Circuits by the Officer in Charge
of Work
CS-PTW-SOP-02 - Training and Authorisation of Roles in the PTW
System
CS-OHS-34 - Selection, Maintenance and Use of Electrical Safety
Equipment and PPE
S1885 – Live Electrical Work Checklist Form
S1878 - Job Safety and Environmental Analysis (JSEA) Template
S1976 - High Voltage (HV) Work Control Checklist
B/D/12/768 – CS-OHS-54 – TEST TO PROVE DE-ENERGISED
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Author
Qld Govt
Qld Govt
CS Energy
CS Energy
CS Energy
CS Energy
CS Energy
CS Energy
CS Energy
CS Energy
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