PERIODIC SAFETY CHECK
OF PRIVATE SERVICE LINES
NP15/105
Feb 2013
PROCEDURE
PERIODIC SAFETY CHECK
OF
PRIVATE SERVICE LINES
Purpose
The service line that connects private property to the networks distribution line is owned
by the property owner. The property owner/consumer is legally responsible for the
safety and maintenance of their electrical installation; this includes overhead or
underground service lines, not just the wiring inside a building.
This standard will provide the consumer and the consumer’s contractor with a clear
process for the regulatory periodic safety check of private service lines to prevent
serious harm to members of the public or significant damage to their property.
Prepared By :
K Tierney
Approved For Issue By:
G Lloyd
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Documentation Revision Control:
Document
Revision
Description of Change
Date
Version 001
Initial Standard document
Reviewed – No changes
New definitions
Added sections 6 to 6.8 General checks
24/11/2009
30/11/2011
17 /7/2012
1/02/2013
Version 002
Version 003
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Index:
NP15/105
Feb 2013
Definitions
1
Introduction- Consumers Responsibility
Safety Compliance Checks
2
Regulations
3
High Voltage Lines
4
Private HV Lines – Asset Management
5
‘Electrically Safe’ & ‘Electrically Unsafe’
6
General Checks
7
Certification of private lines
8
Electrically Unsafe Lines
9
Verification Dossier
10
Safety Checks – Periodic Assessment
11 Specific Earth Testing
12 Equipment Check for Private HV Line
13 Preventative Maintenance
14 Preventative Maintenance Tasks and Intervals
15 Access to Power Lines
16 Trees and Power Lines
APPENDIX
List of Authorised Contractors
Certificate of Periodic Safety Check
Record of Periodic Earth Tests.
Safety Compliance Checks – Flow chart
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Definitions:
Consumer: means any person who is supplied, or who applies to be supplied, with
electricity.
Contractor: means any competent person or organisation carrying out work for the
consumer.
Works:
means all fittings that are used in conjunction with the generation,
conversion, transformation or conveyance of electricity but, does not
include any part of an electrical installation.
Consumers Works: means the privately owned portion of service line between the
Point of Connection (POC) to the network line and the Point of Supply
(POS) at the end users property boundary.
Point of Connection: (POC) means the point of demarcation where the private owned
line connects to the network owned line. The POC is usually the location
of the network owned isolation device which could be either LV or HV.
Point of Supply: (POS) means the point at which the service line crosses the end
users property boundary as defined in the Electricity Act 1992. The line
then becomes part of the electrical installation. If the POC is within the
end users property boundary, the POS is at the same location.
Electrical Installation: means all fittings beyond the property boundary (POS) that
form part of a system that is used to convey electricity to a point of
consumption or used to generate or store electricity. Can include a private
service line.
Private HV Line: A private HV service line is an overhead or underground power line
exclusively for use by the end user. The transformer is owned by NWL
and power is consumed by LV appliances. The line may also be used
jointly by other consumers. The supply transformer, the HV and LV service
fuses are owned by NWL.
Joint Service Line: Is a service line that supplies in part a third party for example,
where the last length of line to a consumer’s property branches off a line
owned by a neighbouring property.
Safety Check: means a careful examination of the works or installation to confirm that
it is within compliance with the Electrical Safety Regulation 2010, Reg. 41
to 46 and assessed whether or not it is ‘electrically unsafe’.
Test:
means a logical methodology with or without test instruments to ascertain
whether an electrical installation meets required performance standards.
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Vegetation Safety Clearance: means the required clearance distance between trees
and other vegetation and the electrical conductors.
1
INTRODUCTION – CONSUMERS RESPONSIBILITY.
The enactment of the Electricity Act 1992 and the Electricity Safety Regulations
2010, requires owners of electrical installations Under Regulation 15 – “Using
Works, Installations, Fitting and Appliances”, to ensure that installations are not
used if found electrically unsafe.
An electrical installation may also include a private service line that conveys
electricity between the lines owned by the network company (the network) and a
consumer’s premises. The point at which the network ends and the private service
line begin is the point of connection/point of supply and is usually where network
owned isolation fuses are located.
A private service line may be connected at high voltage or low voltage and owned
by the end user, either alone or in part by a third party (joint ownership). A private
service line may be located on land owned by the end user and/or on land owned
by a neighbouring property.
The private service line owners’ responsibility extends to the operation,
maintenance, safety and replacement of the power line. The only exceptions to the
above are NWL owned meters, relays and the supply transformer associated with
the installation.
The owner may however, contract their responsibility for the operation and
maintenance of the line to a competent person. The consumer is still obligated to
ensure the periodic safety checks are done by a competent person so that the lines
and the poles supporting them are not in an unsafe condition. This includes
checking for close contact with trees etc.
Keeping your power lines in a safe condition will help to ensure you, your family and
the general public avoid serious injury or death.
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2. Regulations: - Existing Installations
Low Voltage Lines - the consumer shall employ their own electrical Contractor to
perform the required periodic safety checks. The Electricity Safety Regulations
outlines some basic conditions which will constitute an unsafe electric line if
measures are not in place to:
• Prevent accidental contact with exposed live conductors
• The characteristics of poles and fittings are impaired, broken or badly damaged.
• Conductors are not secure at terminations and supports.
• Accessible non earthed exposed metal parts within 2.5m above ground.
• Electric line conductors within the minimum ground clearance.
• Construction, buildings, excavations or other works within the minimum safety
distances (NZECP34)
3 High Voltage Lines – Installations & Works
ESR,s 40 and 62 require every owner of private lines to establish and implement
a periodic safety checking system on a regular basis that complies with the
following:
The safety checking system must ensure–
• The HV lines be checked for compliance with regulations 41 to 46.
• Provide periodic checking at reasonable intervals. (NWL inspects its own
distribution lines on a rotational basis every 5 years).
• That records to be kept of the results of every periodic check to demonstrate this
responsibility has been met and what maintenance work has been done.
Standard NP25/55 – Recording Periodic Safety Check provides a standard
process to follow.
4 HV Service Lines – Asset Management:
The Electricity Act requires high voltage assets to be managed by a body or person
as defined in the Act as an Electricity Operator.
NWL is an Electricity Operator and offers an asset management service to ensure
high voltage lines are regularly checked and records kept. The service will only
apply to outdoors high voltage service lines and will include:
• Documentation that clearly identifies the assets owned by the consumer
• Faults answering service.
• High voltage operating of the service line.
• NWL has offered each line owner to undertake the prescribed safety checks
required by the Electricity Regulation every 5 years in line with this Network
Standard NP15/105.
• The consumer must in addition visually check over the line for anything that looks
unsafe at least on a yearly basis. Record these checks.
• NWL will test the transformer earths every 5 years to ensure electrical integrity in
accordance with Network Standard NS10/15 Section 8 “Testing Earthing System
Resistance”
• NWL will maintain a data base of those installations and the dates when the next
inspection and tests are due.
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• NWL will notify the consumer of the results of the safety checks and earth tests,
and what remedial action may be necessary.
Consumers must notify NWL if they do not wish to avail themselves of this
management service. The consumer must then engage their own Electricity
Operator to manage and operate their private service line in accordance with the
Act.
5. ‘Electrically safe’ and ‘electrically unsafe’
is defined in ESR 5 such as to create a spectrum that increases from the former to
the latter. The state of being electrically unsafe is the point at which the risks of
serious harm to persons or significant damage to property become intolerable in
the view of a reasonable person.
‘Safe’ generally denotes compliance with current regulations, codes and
Standards, but most of the works and installations now in existence and in use will
have been designed and installed to older regulations, codes and Standards. They
age and deteriorate over time. The current regulations permit these to still be used
provided they are not ‘electrically unsafe’. The risks associated with their use may
be higher than if they were ‘safe’ but they remain in the tolerable range of
acceptance.
6
General Checks
6.1 General
Means the visual examination of electrical equipment of an installation to provide a
judgement on its condition with set criteria to ensure that it is not electrically unsafe.
6.2 When an installation is designed and installed the following measures are basic
and are those which establish a safe installation.
•
•
•
Test to ensure polarity and phasing is correct
Rating of protection device is correct
Ensure that the installation is compatible with the supply system.
Major safety features are provided for in the installations design:
1. Protection against direct contact.
2. Protection in case of indirect contact.
3. Protection for mechanical soundness of equipment
4. Protection when working on electrical installations.
5. Protection from dangers resulting from arc fault.
6 Protection against fire.
Periodic safety checks for private high voltage service lines (ESR 40) require
checks to be made to ensure the above mentioned safety features are not unduly
compromised with regards to ESR 41 to 46:
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6.3 Strength of Structures (ESR 41)
The overhead line is designed, constructed and maintained so that it will readily
withstand the stresses placed on it by extreme wind, rain, snow, and ice and such
other events as earthquakes, floods, lahars, etc. that might be reasonably
expected in the location in accordance with ESR 41. (The network company may
advise the construction standards that it applies for the design, construction and
maintenance of its own HV overhead lines in similar locations).
6.4 Effective Connection to Earth (ESR 42)
The system of which the overhead line is part is provided with an effective
connection to the general mass of earth in accordance with ESR 42. The
connection to earth will normally be provided by the supplying network where the
neutral is effectively earthed at the distribution transformer (MEN), in which
case it may be assumed by the person carrying out the safety checks as being
effective.
6.5 Isolation (ESR 43)
Convenient means exist, in accordance with ESR 43, to isolate the HV electrical
Installation from the supplying network by means of a HV switch, fuses or links
provided either within the HV electrical installation or else by the supplying
network.
6.6 Effective Electrical protection (ESR 44)
The private overhead line is protected by fuses placed at the point of connection
plus the protection of the supplying network (as permitted by ESR 44). In rare
cases, the private overhead line is protected by a circuit breaker or recloser at the
point of connection with protective relays provided to discriminate with the
network protection.
Equipment, other than fuses, that is provided to protect the overhead line has
been checked for correct installation and operation by way of secondary injection
and primary injection testing to check the correctness of CT ratio and polarity.
Settings provide for full discrimination to lessen the risk of operation of network
feeder protection acting as backup protection.
6.7 Notices (ESR 45)
Wherever the overhead line is constructed of poles or supports that may be
climbed without the use of equipment (such as a ladder), and the conductors of
the line are un-insulated, conspicuous and durable notices reading “Danger Live
Wires” or similar are present on the poles or supports as per ESR 45.
6.8 Records and Plans (ESR 46)
Records as required by ESR 40 are kept, and are available to the network
company or request, as to the dates and results of safety checks carried out on
the overhead line. Records and plans as may be reasonably required by ESR
46 are kept, and may be accessed by any person reasonably requiring them, as
to the ready location of the overhead line.
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7 Certification of Private HV Lines
From the moment a HV line is left connected, responsibility shifts to the owner to
ensure that it remains in the state of not unsafe. Periodic safety checks mandated
in ESR 40 provide the owner with a recognised means of ensuring this safety
thereby removing owner liability.
The duty of the safety check assessor is to report on the status of the works. If any
deficiency is found which would not render it to be ‘electrically unsafe’ there
is no requirement to have it rectified prior to the assessor issuing certification to
the owner who requested it.
8 Electrically Unsafe Lines
If any deficiency is found which would render the works electrically unsafe the
assessor must notify the owner and NWL of the unsafe non-compliance.
The owner has the responsibility under the regulations to have the non-compliance
rectified within the prescribed time specified in the ESR 41.
NWL has the final option of removing the unsafe connection from its network until it
is rectified. NWL will follow up with the individual responsible to ensure the required
work has been done. If the unsafe service line is shared, NWL make contact with
all affected owners/consumers.
It is still the owners/consumers obligation to keep an eye out for things that don’t
look safe and be sure to deal to them before they get worse. Do not just rely on
the safety check carried out every 5 years. The consumer must check more
regularly.
9 Verification Dossier
The owner of a private HV service line should hold documentation outlining the
assets which they own and the subsequent periodic safety checks along with what
maintenance work has been done..
It is vital that all documentation relating to the private line be recorded and filed in a
Verification dossier or the like and be kept by the Installation owner to prove
regulatory compliance.
Verification dossiers are expected to include other relevant documents where
applicable:* Certificate of Compliance number (or copy thereof, the Consumer would have
received the certificate from the installing contractor for any new installation
work).
* Plans of the installation including location of earth mats and underground cables.
* Details of equipment (manuals)
* Equipment and Appliance Test Certificate commissioning tests and results of the
periodic safety checks.
* Records of maintenance work.
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Plus any other relevant information including, design calculations where
appropriate.
10. SAFETY CHECKS - PERIODIC ASSESSMENT
10.1 A line owner who chooses to nominate NWL as the Electricity Operator to provide
the asset management of their line can expect the safety compliance checks as
shown in the Appendix - Flow Diagram for Service Lines.
A line owner who chooses to nominate an alternative provider for asset
management as their Electricity Operator must ensure the safety compliance
checks are as shown in the Appendix – Flow Diagram for Service Lines.
10.2 The on-going safety of any High Voltage installation including a private service line
is measured by periodic safety checks. NWL has a 5 yearly rotational safety check
on its own network and will, as your chosen operator, check your private HV service
line on the same basis.
It’s the owner’s obligation to ensure that their installation is periodically checked to
determine whether or not it is unsafe with regards to ESR 41 to 46.
10.3 A safety check does not imply that an installation will remain electrically unsafe.
Rather it is a report on whether or not it was ‘unsafe’ at that space in time.
Regulation 15 makes it the responsibility of the owner or operator to ensure the
installation is not unsafe and the safety check provides proof (or otherwise) of
meeting that responsibility. The periodic Safety Certification Report should be filed
in the Installation’s verification dossier and held by the owner.
When carrying out a safety check the inspector should check whether equipment is
appropriately identified and labelled with respect to the diagrams and records.
11. Specific Earth Testing
The integrity of the earthing system of transformers should be verified by
appropriate periodic inspection and tests. NWL will visually check the earth
conductors and connections when conducting the usual 5 yearly periodic safety
checks on service lines.
NWL will do resistant measurement tests to ensure electrical integrity of
transformer earths associated with private service lines on a 5 year basis when
testing other NWL transformer earths in the same area.
Records of all resistance tests will be maintained by NWL and the private service
line resistance tests will be notified to each consumer on the Consumer Earth Test
report shown in the Appendix.
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12. Equipment check for Private HV Line
Where applicable, the following equipment should be included in the safety check:
Overhead lines Cables
-
Clearances from ground, structures, trees etc., Electricity
Regulations 17 and ECP34
Clearances from other lines, ECP34.
Check for change of usage of ground under lines and its effect on
clearances and hazard to supports.
Line condition, warning notices, pole and crossarm state, insulator,
braces.
Earthing of metalwork including cable potheads, ABS’s etc.
Point of entry, clearances, warning notices, building changes, or
hazards to maintenance staff.
Structures, e.g. transformer, pole state, insulation, earthing,
conductors, clearances.
Cables adequately supported and protected on poles including
inspection of - cables, o/h terminations, earthing of potheads where
appropriate, warning notices, radius of bends, cable entry to
substations.
Examine transformer and switchgear Cable terminations for leaks,
heat, and noise. Check that cable armouring is securely terminated
and earthed. Inspect cable insulation and continuity records. Cable
route marking.
Earthing
-
Check that earthing of substations, switchgear etc. is in accordance
with ECP35-(6.5) (6.6)
Check earthing of structures, buildings,
ECP35 (6.6).
Neutral point earthing or artificial earthing points.
Fuses
-
That fuse sizes are appropriate for transformer protection.
Fuse storage is adequate.
Fuse Resistance tests
Transformers
(usually
owned
by NWL)
-
Check for oil leaks, tank distortion.
Check oil level, colour, and oil temperature.
Silica gel breather operation.
Earthing conductors attached.
Cable terminations sound, insulation intact, neutral earthed if
appropriate.
Check test records.
Check case and radiators for damage and or corrosion.
Test Equipment -
Check test and measuring equipment records for appropriate test
results.
Inspect test equipment for serviceability
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Earthing
Attachments
-
NP15/105
Feb 2013
Check condition of flexible cables,
appropriateness of cable cross section, terminations and insulating
pieces.
13. Preventative Maintenance
Maintenance is undertaken to maintain the value of the assets, maintain adequate
levels of reliability and it should identify conditions of reduced safety.
Safety checks are an important element of maintenance but their use must be
controlled to improve reliability.
Important elements to be considered are:*
*
*
*
*
*
*
the frequency
their scope
what equipment is to be checked
what is to be checked for
standard “check lists” are necessary to ensure consistency
record and report findings
work schedule from findings
14. Preventable Maintenance Tasks & Intervals
The owner of a private service line must ensure that the following are typical tasks
carried out on private service lines and the maintenance period which should be
followed:Overhead Lines
Inspect condition of cross arms, insulators, conductors and
poles every 4-5 years frequency, depending on pole type
and age. Check clearances from ground using NZECP
34:2001 for electrical safe distances.
Wood Poles
All wood poles must be checked prior to climbing. Consumer
owned poles must be subject to a rigorous pre-climb
inspection including underground checks.
Underground Cables Check they are adequately supported and Protected from
damage.
Transformers
Check that oil leaks do not contaminate the ground- annually
where applicable.
Earths
Tested every three to five years. NWL will carry out these
tests on a regular basis.
Trees
Check for trees which could pose a hazard to power lines.
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15. Access to power lines
Where property owners do not own the power lines which cross their property they
have rights and responsibilities in relation to those lines. For new lines, the line
owner will have needed an easement or other contractual agreement to build the
line. Under the easement or agreement, the line owner has the right to access the
private property to maintain those lines.
For older lines where there is no agreement in place, the line owner has the right
under the Electricity Act 1992 to access the private land to inspect, maintain and
replace the lines (so long as the line replacement does not injuriously affect the
property). The land owner can set reasonable conditions for the line owner’s access
but cannot include payment of money.
16. Trees and Power Lines
The Electricity (Hazards from Trees) Regulations 2003, governs the control of trees
around power lines. The property owner has obligation under the regulations
reinforced by the consumer’s contract with their electricity retailer. The contract
requires trees and other vegetation be kept away from all power lines and other
electrical equipment on private property.
NWL is not obliged to inspect the trees and vegetation around
private lines, but may observe a problem in the course of its other tasks. If a tree
problem is observed, NWL may issue a Cut & Trim notice. This does not in any way
reduce the responsibility of the private service line owner for inspecting their own
line on an annual basis for tree and other vegetation hazards.
If you wish to cut or trim trees near you’re privately owned service line , we
recommend that you engage a competent contractor who will have the essential
skills and specialist equipment to conduct the work safely. Ring NWL on 0800 440
220 for a list of competent contractors.
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Safety Compliance Checks – Flow Diagram for Service Lines
NP15/100 Guidelines for
Management of Service Lines
Owner & (NWL)
(Owner)
NWL Asset Management
Data Base
Owner notified of line
NWL will be
Owners
ownership. Plan & Asset
Electricity Operator
Alternative Nominated
report forwarded to owner
Electricity Operator
*Owner to ensure regular
Faults
maintenance & repairs done
Service
Manage Faults, operating,
and regular safety check
Repairs & maintenance and ensure
Operating
Periodic Safety Checks are done
See NP15/105
NWL 5 yearly assessment check
Periodic Safety Checks
NP15/105
(Ensure it’s not electrically unsafe)
Stability poles
Tree
Structures
proximity
X arms etc.
Earthing
Change in
ground
clearances
(Ensure it’s not electrically unsafe)
Owner
UG pole
Inspection
Owner Regular/yearly
Manage safety check
yearly of lines, poles
tree
(electrically
Inspections
safe)
Proximity to
buildings
Recording Periodic
Safety Checks
NP25/55
Devise system of
recording Safety Checks
Owner to
Arrange
repair &
maintenance
Inform Owner
of results
Owner to file
Record of checks, Repairs & maintenance
in owners dossier file to prove Regulation compliance
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APPENDIX
Approved Contractors for work on Private Overhead Lines:
•
Network Waitaki Contracting, Oamaru
Manager: Derek McGee (03) 433 0591 or 027 491 6155.
•
Network Electrical Servicing, Invercargill
Manager: Michael Fife (03) 218 8897 or 021 491 951.
•
Electricity Ashburton
Manager: Wayne Watson (03) 307 9800
•
Lemacon, Ashburton
Manager: Tony Potts (03) 307 6622 or 021 784 641.
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NETWORK WAITAKI LTD
CERTIFICATE OF PERIODIC SAFETY CHECK
Asset Condition Periodic Safety Check Record
Name:
ICP Number:
Location:
Postal Address:
5 February 2009
Asset Identification Diagram
See Over Page
NWL
PVT
POS
HVDC
-
Network Waitaki Ownership
Private Ownership
Point of Supply – legal boundary where electricity enters the premises
HV disconnection point – physical demarcation point of line ownership
Asset Listing
ID Description
Line Segment
L432-09-00,
Pole 20419
Pole 20420
Pole 20421
Pole 20841
Transformer Site
Transformer T836
Owner
Inspection Date
Result
PVT
PVT
PVT
PVT
PVT
NWL
Mar 2008
Mar 2008
Mar 2008
Mar 2008
Mar 2008
Mar 2008
Pass
Pass
Pass
Pass
Pass
Pass
I certify that the results of the periodic safety check of the above private service line with
Electricity (Safety) Regulation 40, are as stated on the attached Information and Safety Check
Report:
This certificate is subject to the condition that all reasonable care has been exercised in the
inspection of the overhead line and no other mechanical or electrical defect was detected that
will render the line unsafe.
Signature
NETWORK WAITAKI
Date
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NETWORK WAITAKI LTD
Form NF05/180
General information and Safety Check report for safety checking system
compliant with ESRs 40-46 of Electricity (Safety) Regulations 2010.
I certify that the identified overhead line has been safety checked and I consider that the line is: (strike out
options that do not apply)
a) not structurally, or electrically unsafe and may continue to remain in service with the application of
routine maintenance for the next five years.
b) structurally/electrically unsafe and the remedial work identified in the report needs to be done
within the next……….months in order to remain in service, subject to a further safety recheck
after that date.
c) structurally/electrically unsafe and should be disconnected forthwith, to be reconnected only after
completion of the remedial work in the report and a further safety recheck.
Item
Information required
Information/comments
Owner of Line
Location
Voltage of line
Two wire, three wire 11kV
Classification of line
Consumer works,
Installation
Actual or assessed
Line construction year
Applicable regulatory safety period
ESR 38: protection of line provided?
ESs 1984, 1993, ECP 34
1193
Fuses, HV earth fault and
overcurrent, etc?
Protection provided by NWL or
owner?
Type of poles
Wood, concrete,
ESR 41: poles capable of
withstanding likely structural loading?
ESR 42: earthing system for
protection provided?
Is any pole structurally
unsafe?
Neutral earthed at supply
transformer
Earthing system provided by
NWL/owner?
ESR 43: line isolation?
Means of isolation provided by
NWL/owner?
ESR 44: earth fault protection
provided for HV conductors
Fuses, links, hard wired?
Earth fault protection
provided on NWL HV
feeder?
Earth fault protection provided by
NWL/owner?
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ESR 44: protection setting or fuse
rating appropriate?
ESR 45: danger notices in place on
all climbable poles carrying uninsulated conductors?
ESR 46: documented safety checking
system with full records in place held
by the line owner?
Location of the point of connection
with the network?
Location of the point of supply along
line
NP15/105
Feb 2013
Setting of fuse rating
discriminates with NWL
feeder protection for most
faults?
Copy held by NWL where
default operator
Pole number
Nearest pole number
General condition of cross-arms,
fasteners & stays
General condition of conductors
Any buildings or other structures
within safety distances of line
Any trees along the line which
encroach the growth limit zone?
Are any poles marked with orange
suspect tag?
Are any poles marked with a red tag?
What remedial work is needed to
ensure public safety for at least 5
years?
When should remedial work be
carried out to ensure public safety?
Signature………………………..
NETWORK WAITAKI
ERs 1984, ECP 34 1993,
ECP 34 2001?
Within three months, six
months, twelve months?
Date………………
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Feb 2013
Appendix
RECORD OF PERIODIC EARTH TESTS
PRIVATE HV SERVICE LINE
TRANSFORMER SITE NUMBER. T………….
Consumer………………………………………
Address…………………………………………….
……………………………………………..
To be measured at intervals of not more than 5 years
Equipment
Transformer
Air Break Switch
Surge arrestor
Other
Mounting
Single Pole
□
Two Pole
□
Ground Mount □
□
□
□
□
Test each electrode resistance, MEN system resistance and,
”Touch and Step” resistance.
Earth
No.
Electrode 1
Voltage
R1Ω
RESISTANCES
Electrode 2
M.E.N
Step
Resistance
R2Ω
R3Ω
R4Ω
Touch
Resistance
R5Ω
Remarks……………………………..
…………………………………
Measured By……………………………..
NETWORK WAITAKI
Revision 003: Feb 2013
Page 19 of 19